Hunter GSP9700 Series Operation Instructions Manual Download | Manualshive

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The measured loaded tire diameter (displayed for each tire/wheel assembly) can also
affect the pull condition. A significant difference in these measurements may indicate
under/over inflation in a tire or a mismatched set of tires.

Another common factor that can affect steering pull or drift in relation to the tires is
the variation in air pressure of the two tires when compared side to side on a given
axle. Tire pressure measurement is prompted with a pop-up screen before every load
roller measurement.

GSP9720JLR Wheel Balancer Operation Instructions

Theory of Operation

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Summary of Contents for GSP9700 Series

Page 1: ...5827 T 09 09 Supersedes Form 5827 T PRELIMINARY 12 08 GSP9700 Series Wheel Balancer GSP9720JLR Road Force Measurement System With SmartWeight Balancing Technology Software Version 3 0 Copyright 2008 2009 Hunter Engineering Company ...

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Page 3: ...__________________________________ Phone Number ___________________________________________________________________ Concept and Procedure Training Checklist Trained Declined Safety Precautions Quick Thread AutoClamp optional Autostart Servo Stop Maintenance Calibration Cleaning Lubrication and Maintenance of Adaptors Hub and Shaft Calibrating the Balancer Calibrating the Load Roller and Dataset Ar...

Page 4: ...____________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________...

Page 5: ...2 SmartWeight Balancing Technology 15 Static and Dynamic Imbalance Sensitivity 15 2 3 SmartWeight Balancing Technology Dynamic Weight Planes 16 2 4 Using SmartWeight Balancing Technology 16 2 5 SmartWeight Forces and Limits Feature 18 2 6 Weightsaver Wheel Balancing Feature 18 2 7 SmartWeight Odometer 19 Show Savings Summary 20 3 BALANCING PROCEDURES 23 3 1 Mounting the Wheel Using Wheel Lift Opti...

Page 6: ...ixed Weights Clip on Adhesive Balance 60 Measuring Dimensions for Adhesive Weights Balancing 61 Rim Runout Measurements 63 3 18 Blinding and Rounding 66 3 19 Split Weight Feature 66 Split Weight Operation 66 Correcting Large Imbalances 67 3 20 Split Spoke Feature 67 Hiding Adhesive Weight Behind Spoke 68 Re entering Similar Wheel after Split Spoke is Enabled 69 Placing Hidden Weight Inside of Holl...

Page 7: ...reen Limits Enabled 102 4 9 Details Screen 103 Tire and Rim Road Force and Runout 103 4 10 Printouts 105 4 11 Harmonics T I R Data Plots 106 Assembly Data Plots Screen 106 Tire Data Plots Screen 107 Rim Data Plots Screen 108 4 12 Statistics 108 Show Statistics 108 5 EQUIPMENT INFORMATION 111 5 1 Software Identification 111 5 2 Program Cartridge and Security Key Removal and Installation 111 5 3 Bal...

Page 8: ...y 130 Motor Drive Service Mode Only 130 6 4 Cleaning the Console 130 6 5 Maintenance 131 Spindle Hub Face and Shaft 131 BDC Laser Adhesive Weight Locator Maintenance or Service 131 Optional HammerHead TDC Laser Clip On Weight Locator Maintenance or Service 131 6 6 Mounting Cone Maintenance 132 7 THEORY OF OPERATION 133 7 1 Harmonic Vibrations 133 7 2 Road Force and Runout Measurement 135 Force Var...

Page 9: ...information needed to operate the GSP9720JLR The following sections contain detailed information about equipment operation and procedures Italics are used to refer to specific parts of this manual that provide additional information or explanation For example refer to GSP9720JLR Components page 8 These references should be read for additional information to the instructions being presented 1 2 For...

Page 10: ...y and shorten the life of the balancer Keep all instructions permanently with the unit Keep all decals labels and notices clean and visible To prevent accidents and or damage to the balancer use only Hunter Road Force GSP9700 Series Road Force Measurement System recommended accessories Use equipment only as described in this manual Never stand on the balancer Wear non slip safety footwear when ope...

Page 11: ...he electrical power outlet After servicing be sure the balancer ON OFF switch is in the O off position before plugging the power cord into the electrical power outlet This device is rated as Class A for radiated emissions In the event of radio interference the display read out may flicker this is normal Decal Information and Placement Right Side View Decal 128 964 2 gives the maximum wheel diamete...

Page 12: ...ove the screw because of the risk of electrical shock Back View Decal 128 381 2 warns the user not to remove the cover of the GSP9720JLR because of the risk of electrical shock and not to use below garage floor level Decal 128 229 2 and decal 128 905 2 work in conjunction to caution the user to not remove the screw because of the risk of electrical shock 4 x Getting Started GSP9720JLR Wheel Balanc...

Page 13: ...ION A protective ground connection through the grounding conductor in the power cord is essential for safe operation Use only a power cord that is in good condition NOTE For information on converting from single phase NEMA L6 20P plug to thee phase NEMA L15 20P plug refer to Form 5350T NEMA L6 20P to NEMA L15 20P Power Plug Conversion Instructions Specific Precautions BDC Laser Indicator The BDC B...

Page 14: ...ser and never look into the laser beam Turning Power ON OFF The ON OFF switch is located on the back of the balancer cabinet To turn the balancer ON press the I side of the ON OFF switch To turn the balancer OFF press the O side of the ON OFF switch The system requires about twenty two seconds to boot up After the GSP9720JLR performs a self check the Logo screen will appear indicating the unit is ...

Page 15: ...ions Electrical Voltage 230VAC 10 15 1 phase 50 60 Hz power cable includes NEMA 20 amp plug L6 20P Amperage 10 amperes Wattage 3450 watts peak Air Air Pressure Requirements 100 175 PSI 6 9 12 0 bar Approximate Air Consumption 4 CFM 110 Liters Minute Atmospherics Temperature 32qF to 122qF 0qC to 50qC Relative Humidity Up to 95 Non condensing Altitude Up to 6000 ft 1829 m Sound Pressure Level Equiva...

Page 16: ...nt Earth ground terminal Protective conductor terminal l ON supply condition OFF supply condition Risk of electrical shock Stand by switch Not intended for connection to public telecommunications network 1 3 GSP9720JLR Components 8 x Getting Started GSP9720JLR Wheel Balancer Operation Instructions ...

Page 17: ...er D 221 658 2 Hammer Head Protectors 4 I 223 68 1 Pressure Ring E 46 320 2 Spacer J 65 72 2 Calibration Weight For optional accessories refer to Wheel Balancer Brochure Form 3203 T JLR Wheel Mounting Kit A B C A 192 152 2 Standard Cone B 192 156 2 JLR Cone C 20 1839 1 Kit Universal Flange Plate For optional accessories refer to Wheel Balancer Brochure Form 3203 T GSP9720JLR Wheel Balancer Operati...

Page 18: ...etween the K2 and K3 labels indicates how many rows of labels are available Most screens have only one or two rows however more rows are possible The green box indicates the row that is currently displayed The menu row is changed by pressing the menu shift key When this key is pressed the menu labels change to the next row down If the last row is currently displayed the menu labels change to the f...

Page 19: ...urrent primary screen Rotating the control knob clockwise or counter clockwise changes the setting for the selected on screen switch For example in the Balance primary screen pushing in on the control knob will cycle through the grams to ounces the static and dynamic and the SmartWeight Standard balance screen switches After selecting an on screen switch the setting may be selected by rotating the...

Page 20: ...ll always return to SmartWeight balancing upon dimension entry or a reset Resetting the Program The wheel balancing program may be reset at anytime by using the key located on the LCD support console directly beneath the LCD To reset the balancer press the reset key twice within a four second period without pressing any other keys in between This prevents a single accidental keystroke from resetti...

Page 21: ...g a bounce to be felt This static imbalance condition is evident by a jiggle or up down movement of the steering wheel These vibrations may also be apparent in the body with or without steering wheel shake A statically imbalanced tire driven for an extended period may cause cupping in the tire s tread create vibration and adversely effect handling Static balancing alone is a seldom recommended pro...

Page 22: ...he steering wheel Excessive dynamic imbalance of this type creates a shimmy that transfers through the suspension components to the occupants of the vehicle especially at higher speeds IMBALANCE WOBBLE LATERAL TWIST OR TORQUE FRONT VIEW ZERO STATIC IMBALANCE WITH LARGE COUPLE IMBALANCE Modern dynamic balancers spin the wheel in order to measure both the up and down static imbalance force and coupl...

Page 23: ...eight saved over time A histogram of weight savings statistics can be viewed from the Logo screen Static and Dynamic Imbalance Sensitivity As a general rule of thumb to achieve the best balance on an average sized tire and wheel assembly 15 inch rim Residual static imbalance should be less than 1 4 ounce 7 grams Residual couple imbalance should be less than 3 4 ounce 21 grams Residual couple imbal...

Page 24: ...ancing Technology The SmartWeight balancing forces display varies greatly from the standard balancing display SmartWeight tire graphs independently display the static and couple forces within a tire wheel assembly A single plane static mode and non round off modes are no longer necessary The traditional static and dynamic modes are eliminated The traditional non round off mode is eliminated These ...

Page 25: ...ht Balancing Technology to Traditional Dynamic Balancing Modes NOTE To quickly exit SmartWeight and force a static balance input the one static plane twice tapping the foot pedal twice without moving the dataset arm Respond yes to the confirmation screen to exit SmartWeight The balancer will revert back to SmartWeight upon another dimension entry or a reset At any time SmartWeight balancing techno...

Page 26: ...he couple force to further save weight allowing a fine tuned balance and weight use reduction With SmartWeight a bar graph in the green is within acceptable limits Weightsaver allows the couple bar graph window of residual couple force to remain The Weightsaver wheel balancing feature is a percentage of the force limit intentionally left in the assembly to save weights Adjusted lower value favors ...

Page 27: ...urate balancing than a traditional balance using fixed plane weight rounding function This is critical when balancer to vehicle centering errors affects the residual static forces on the vehicle 2 7 SmartWeight Odometer SmartWeight Odometer displays the accumulated savings on the balance screen GSP9720JLR Wheel Balancer Operation Instructions Introduction to Balancing x 19 ...

Page 28: ...screen press the Show Savings Summary softkey for detailed explanation of savings NOTE Show Savings Summary will be projected savings when selected time frame exceeds actual time of use A summary of the savings due to SmartWeight is displayed NOTE Set Assumptions key available in Service Mode only Rolling the selector knob will change from Daily to Weekly to Monthly Yearly and Five Year savings Se...

Page 29: ...er Install Date softkey to enter a date for the savings screen to properly show time to savings values Select Exit softkey when done To view the payback of balancer from savings due to SmartWeight select Investment Return softkey from the Smart Weight screen Rolling the selector knob will change from months to years of payback Pressing the selector knob and then rolling it will change from percent...

Page 30: ...weight and percentage Select Print Screen to print the weight savings displayed Select Exit softkey when done NOTE The statistics can be cleared by selecting the Clear Data softkey This could be used if tracking weight during a specific period The Clear Data key may only be selected when in Service Mode For more information refer to Service Mode Setup and Features page 113 22 x Introduction to Bal...

Page 31: ...the optional wheel lift refer to Mounting the Wheel page 25 Raising the Wheel Assembly Slide the appropriate mounting cone onto the spindle Position wheel lift carriage at the end of the wheel lift rail Press the lift control handle down until the trolley carriage is at its lowest level Roll the wheel assembly onto the wheel lift carriage GSP9720JLR Wheel Balancer Operation Instructions Balancing ...

Page 32: ...e spindle Keep the wheel lift carriage in place under the wheel assembly and close the hood The lifting assembly will automatically lower and park the carriage below NOTE Allowing the balancer to park the wheel lift carriage in place under the wheel assembly will make the removal and lowering of wheel assembly easier and quicker Lowering the Wheel Assembly Remove wheel clamp Starting with the whee...

Page 33: ...basic cone and adaptors do not fit the wheel additional centering adaptors will be necessary A wheel that cannot be properly centered cannot be properly balanced All balancers require additional centering adaptors to properly center certain types of wheels For additonal information refer to Form 3203T for optional accessories Installing the Wheel With the safety hood open place the wheel mounting ...

Page 34: ... installation and removal of the GSP9720JLR wing nut Quick Thread can be enabled or disabled from the Setup screen WARNING Keep clear of clamping components during Quick Thread shaft rotation Lift the wheel assembly onto the shaft as normal without threading on the wing nut With the left hand hold the rim over the cone to remove the weight of the rim from the spindle and to allow maximum quick thr...

Page 35: ...aset arm is out of its home position while in the Balance Current Runout Loaded runout or Measure Rim Runout screens 3 4 CenteringCheck Wheel Centering Feature The CenteringCheck wheel centering feature using Imbalance Forces or Location can be used to inspect each mounting to identify possible centering errors thus preventing improper measurements from occurring CenteringCheck may be used with ei...

Page 36: ...the wheel and re clamp at one half turn approximately 180 degrees from the current position Press Start when ready to take readings Once more position the valve stem at 12 o clock and then press Enter Valve Stem If the rim is centered properly the following screen will appear briefly 28 x Balancing Procedures GSP9720JLR Wheel Balancer Operation Instructions ...

Page 37: ... always compare the previous measurement to the next check If centering is not achieved after four attempts the following screen will appear Check for Correct mounting cone adaptor for this wheel design Wheel defect such as a metal burr interfering with the cone adaptor Dirt or debris interfering with the cone adaptor GSP9720JLR Wheel Balancer Operation Instructions Balancing Procedures x 29 ...

Page 38: ...e proper wheel mounting cone by placing it in the center bore of the wheel to be balanced Select the cone that contacts the wheel nearest the center of the cone Place the wheel mounting cone on the spindle against the spring plate Mount the wheel with the inner rim facing the balancer and centered on the cone Install the clamping cup and wing nut on the spindle shaft against the wheel and secure t...

Page 39: ...one sizes Use of the washer as shown below can improve centering ability by increasing cone pressure against the wheel For example One cone size is too small because the captivated spring is not pressing the cone against the inner wheel opening but the next larger cone size is too big and will not fit the opening Use the smaller cone size with the plastic wheel mounting washer to extend the captiv...

Page 40: ...as previously described Select the proper wheel mounting cone by placing it in the center bore of the wheel to be balanced Choose the cone that contacts the wheel nearest the center of the cone Mount the wheel with the inner rim facing the balancer Place the wheel mounting cone on the spindle with the small end of the cone facing the front of the wheel Install the wing nut and pressure ring assemb...

Page 41: ...en using flange plates The correct flange adaptor setup is determined by Measure and set the bolt circle diameter and number of studs to use against the lug holes Set the number of lugholes as follows A three lug wheel uses three studs A four lug wheel uses four studs A five lug wheel uses five studs A six lug wheel uses three studs GSP9720JLR Wheel Balancer Operation Instructions Balancing Proced...

Page 42: ...ge plate in many cases adds value because it aids in more effective centering than a tapered cone alone This statement is true for many wheels including hub centric wheels That is why a flange plate and back cone may be more accurate and repeatable regardless of whether the wheel is lug centric or hub centric Expandable Collet Mounting An expandable collet should NOT be used with the Road Force GS...

Page 43: ...unting cone against the wheel opening with greater pressure 3 5 Hood Autostart Feature The balancer can be set to automatically spin the wheel upon hood closure After a spin the hood must be lifted completely before the balancer will Autostart again For safety the balancer will not Autostart in Calibration Setup Diagnostics if no balancing procedure is selected or if the Inflation Station hose is ...

Page 44: ...sembly The JLR Balance softkey will start a balance procedure that includes JLR specific procedures Use this when balancing a JLR OEM wheel tire assembly 3 8 Recall Specifications Screen The Recall Specifications screen only appears if the JLR Balance softkey was selected at the logo screen Using the softkeys or the control knob select the JLR vehicle being serviced 36 x Balancing Procedures GSP97...

Page 45: ...canned with the optional handheld scanner Press the Menu Shift key once and select Recall by VIN Scan the VIN barcode on the vehicle with the optional handheld scanner After the VIN has been entered press OK 3 9 TSB Screen GSP9720JLR Wheel Balancer Operation Instructions Balancing Procedures x 37 ...

Page 46: ...ions Screen The Vehicle Specifications screen shows detailed information about the OEM wheel and tire assembly After viewing the Vehicle Specifications screen press Balance to continue Updating Specifications Vehicle specifications may be updated by loading an updated specification file to the balancer via a USB flash drive To update specifications the following items are required A PC with an int...

Page 47: ...e Turn Balancer off using power switch located on back near base of LCD support To access and remove the flash drive first remove the plug from the back panel of the LCD support Pull the flash drive from the USB port within the LCD support GSP9720JLR Wheel Balancer Operation Instructions Balancing Procedures x 39 ...

Page 48: ...click Logon NOTE User Name and password are not case sensitive Click the Download Specifications link Click the file link to download Choose Save or Save to Disk depending on the web browser being used Browse to the location of your storage device USB thumb drive Click Save 40 x Balancing Procedures GSP9720JLR Wheel Balancer Operation Instructions ...

Page 49: ...cer Spec Update screen Follow the on screen instructions and insert the USB drive that contains the new specification file An external USB slot is located on the side of the balancer display Press OK after you have inserted the USB drive NOTE If you wish to exit the uploading process at any time a Cancel key is available on the second row of softkeys Select the appropriate spec file matching the n...

Page 50: ...sentative to order a new software cartridge The balancer will prompt the user to confirm the upload Press OK to continue The balancer may take a few seconds to complete the uploading process Once the upload is complete press OK to exit the update screen and remove the USB drive from the side of the balancer display 42 x Balancing Procedures GSP9720JLR Wheel Balancer Operation Instructions ...

Page 51: ...on for weight or mark application Servo Stop can be enabled or disabled from the Set Up primary screen Refer to Servo Stop page 113 3 12 Spindle Lok Feature Depressing the foot pedal will lock the spindle Locking the spindle will stabilize the wheel for attaching weights at precise locations if automatic weight positioning is disabled and will allow for tightening and loosening of the wing nut Do ...

Page 52: ...enlarged by pressing Set Dimensions or will automatically enlarge if a Dataset Arm is moved from home position and triggered to take rim data The Set Dimensions view enlarges the dimensional diagram of the wheel assembly The inch millimeter selection softkeys are available in this view on the first row menu The control knob can be used to manually enter the rim dimensions 3 14 Spin Tracker Feature...

Page 53: ...and free of debris Remove all previous weights Mount tire wheel assembly Refer to Mount the Wheel on the Spindle Shaft page 25 Enter the rim dimensions using the Dataset arms and select Balance Close safety hood Press the green START button if Hood Autostart is disabled NOTE The following steps will take place automatically each time a wheel assembly is balanced if Prompt for Wheel Assembly ID is ...

Page 54: ...that incorporates a detailed image of each wheel assembly with the stored measurements If a measured value is out of tolerance compared to the recalled specification the value will be printed in red Select Print Summary to view the before and after results Select Print to send before and after balance summary results to the printer 3 15 Balance Modes Select the correct balance mode for each applic...

Page 55: ... page 15 Dynamic Balancing Traditional Balancing Mode NOTE Enter wheel dimensions before selecting dynamic balancing If SmartWeight mode is enabled in setup the balancer will return to SmartWeight balancing upon dimension entry Dynamic balancing is selected by pointing the indicator to while rotating the control knob Dynamic will always display two weight planes Dynamic balancing provides a more c...

Page 56: ...ance than dynamic balancing Dynamic balancing should be selected whenever possible to minimize vehicle vibration Refer to Balancing Theory Static Imbalance page 13 Static Balance Mode Reminder Except Patch Balance Two reminder pop up text messages appear on the balance screen dialog box when selecting static mode The first screen gives the warning Avoid STATIC single plane balancing The second scr...

Page 57: ...the choice of the operator AUTO MODE DETECTION is the default setting automatically choosing the correct type of weights and locations determined by the placement of the Dataset arms STANDARD BALANCE should be selected when clip on weights can be used for both rim flanges MIXED WEIGHTS BALANCE should be selected when a clip on weight can be used on the inner rim flange but not on the outer rim fla...

Page 58: ...utlined below STANDARD Balancing Procedure Using Clip On Weights There are many types of clip on weights Determine the correct application before installing weights Verify that the wheel is clean and free of debris Remove all previous weights Mount tire wheel assembly Refer to Mounting the Wheel on the Spindle Shaft page 25 Press Use the softkey arrows to select STANDARD BALANCE and press OK Selec...

Page 59: ... a complete stop raise the safety hood The GSP9720JLR will find the TDC for the left weight plane if Servo Stop is enabled Servo Stop will hold the wheel in the TDC position while the weight is applied The weight amount will be displayed in green Attach the weight amount shown on the LCD for the left weight plane to the inner rim of the wheel NOTE If optional HammerHead TCD weight locator is insta...

Page 60: ...ture page 66 Left and right weight plane displays should show OK after checkspin STANDARD balancing procedure is complete MIXED WEIGHTS Balancing Procedure Using a Combination of Clip On Adhesive Weights Verify that the wheel is clean and free of debris Remove all previous weights Mount tire wheel assembly Refer to Mounting the Wheel on the Spindle Shaft page 25 Press Use the arrows to select MIXE...

Page 61: ...eel comes to a complete stop raise safety hood The GSP9720JLR will find the TDC for the left weight plane if Servo Stop is enabled Servo Stop will hold the wheel in the TDC position while the weight is applied NOTE If optional HammerHead TCD weight locator is installed the weight should be applied at the location marked by the laser Refer to 3 23 Optional HammerHead TDC Laser Adhesive Weight Locat...

Page 62: ...ttach the adhesive weight using the weight amount shown for the right weight plane on the LCD Refer to Servo Aided Adhesive Weight Placement page 61 If servo is not enabled BDC placement should be used Refer to Manual Weight Position Measurement page 59 If necessary use the right to split the weight Refer to Split Weight Feature page 82 Left and right weight plane displays should show OK after che...

Page 63: ...ion for placement of the right edge of the left adhesive weight and enter the data by depressing the foot pedal Refer to Using the Auto Dataset Arms page 59 Do NOT return the inner Dataset arm to the home position Using the DOWNWARD position move the inner Dataset arm disk edge to the innermost location for placement of the right edge of the right adhesive weight and enter the data by depressing t...

Page 64: ...to Manual Weight Position Measurement page 59 If necessary use the left to split the weight Refer to Split Weight Feature page 82 Return the inner Dataset arm to the home position With the servo enabled attach the adhesive weight for the right weight plane using the weight amount shown on the LCD Refer to Servo Aided Adhesive Weight Placement page 61 If servo is not enabled BDC placement should be...

Page 65: ...he arrows to select PATCH BALANCE and press OK Select either grams or ounces by rotating the control knob and highlighting either g or oz Select DYNAMIC by rotating the control knob to highlight Refer to Dynamic Balancing page 47 NOTE When measuring large tires that will use balance patches it may require removal of the outer arm home position bumper for ample clearance of the outer Dataset arm Th...

Page 66: ...e GSP9720JLR will find TDC for the left weight plane Mark the tire s inner sidewall for patch placement Press the green START button with the safety hood in the RAISED position and the GSP9720JLR will find TDC for the right weight plane Mark the tire s outer sidewall for patch placement Place an aligning mark on the tire and rim to align them back together after applying the patch weights Remove w...

Page 67: ...he arms are triggered a blinking graphic depicting the Dataset arm on the Dimension Entry screen identifies the plane currently being inputted INNER DATASET ARM TRIGGERED BLINKING In most cases the Dataset Arms are used to input the exact weight position The exact weight position is entered by holding the arm s stable in the desired location and depressing the foot pedal to enter the dimensional d...

Page 68: ...al data The GSP9720JLR will beep to confirm data entry NOTE Dataset arms can input dimensions separately if desired Measuring Dimensions for Mixed Weights Clip on Adhesive Balance To measure rim dimensions for the clip on weight pull the inner Dataset arm away from the weight tray and UPWARD until it is touching the wheel inner rim lip Depress the foot pedal to enter the dimensional data The GSP97...

Page 69: ...s enabled in setup the inner Dataset arm can be used to assist in proper placement of adhesive weights Servo aided weight placement is a more precise method of weight placement than manual weight placement The motor will automatically rotate the wheel to the contact point of the arm This eliminates the need for you to eyeball BDC which often results in weight placement error Spin the wheel using M...

Page 70: ...tion to disable To manually place adhesive weights on the rim after spinning the inner Dataset arm should be used to verify the previously inputted distance Rotate the wheel until the location arrow of the desired weight plane is green Lift the inner Dataset arm from home position The real time number displayed between the two numbers that represent previously inputted data displays the current re...

Page 71: ... audit bare rims prior to the installation of a tire Runout can be viewed by selecting Show Runout Road Force from the Balance primary screen Single Arm Rim Runout External Measurement Tire and Wheel Assembly The inner Dataset Arm can be used alone externally to measure rim runout of the inboard bead seat This method is not as accurate as two position measurement but it is faster for QuickMatch pr...

Page 72: ...The motor will slowly rotate the wheel to measure runout While the wheel is in motion gently apply upward and inward fingertip pressure on both Dataset arms as shown below CAUTION Take care when placing hands to measure rim runout that no part of your hands or body interfere with parts in motion NOTE Do not grasp the Dataset arms Use fingertip pressure only 64 x Balancing Procedures GSP9720JLR Whe...

Page 73: ...e locking screw Place the outer Dataset arm ball against the left bead seat lip as shown below OUTER ARM BUTTON OUTER DATASET ARM BALL LOCKING SCREW When outer Dataset arm ball is in place press the outer arm button The motor will slowly rotate the rim to measure runout While the wheel is in motion gently apply a downward and outward pressure on the outer Dataset arm ball When the screen prompts p...

Page 74: ... by the balancer to produce the non rounded correction called for by the single weight before split This provides exact imbalance correction without weight trimming The non rounded imbalance is split regardless of whether blind and rounding are enabled For this reason Split Weight is more accurate than applying a single weight with the blind and rounding enabled Split Weight is especially useful w...

Page 75: ...ounces at the 6 75 ounce weight location and spin the assembly again The display will now call for a 4 5 ounce weight to be placed on top of the 2 25 ounce weight 6 75 oz REQUIRED SINGLE WEIGHT 3 WEIGHTS EQUIVALENT TO 6 75 OZ 2 75 oz 2 75 oz 2 25 oz Press to fan out the two weights until they clear the previously applied 2 25 ounce weight Then place the two indicated ounce weights on either side o...

Page 76: ...ature may be initiated by the following steps before returning the arm to the home position Move the inner Dataset arm to a position centered behind a spoke using the DOWNWARD arm position Enter the data by pressing the foot pedal Rotate the wheel to position the Dataset arm behind an adjacent spoke nearest spoke in either direction Enter the data by pressing the foot pedal Return the inner Datase...

Page 77: ...ervo enabled attach the adhesive weight behind the first spoke using the weight amount shown on the LCD Refer to Servo Aided Adhesive Weight Placement page 61 Press the green START button with the safety hood in the RAISED position and the GSP9720JLR will servo to the location for the second spoke Attach the appropriate weight as displayed on the console All weight plane displays should show zero ...

Page 78: ... spoke However wheel design may make it impossible to enter the right weight plane with the inner Dataset arm The following example is in the mixed weight mode Move the inner Dataset arm to left plane position Enter the data by pressing the foot pedal Measure the distance from the left weight plane to the desired right weight plane using a tape measure This distance must be in millimeters convert ...

Page 79: ...alance procedure being performed Refer to Balancing Procedures page 23 Press the green START button with the safety hood in the RAISED position and the GSP9720JLR will servo to the location for the right adhesive weight plane dynamic or the static adhesive weight plane static aligned with the first spoke With the servo enabled attach the adhesive weight behind the first spoke using the weight amou...

Page 80: ...frequent further reducing or eliminating the static residual RimScan is available only if SmartWeight is enabled RimScan is designed for adhesive weights or mixed weight balancing methods Setting Dimensions with RimScan Select Balance from the main screen and install the wheel on the spindle NOTE For mixed weights first move the inner Dataset arm in the UPWARD position to the clip on weight locati...

Page 81: ... depress and hold the foot pedal The RimScan draw screen will automatically appear As shown below draw the Dataset arm across the rim to produce an on screen live progress of the wheel representation While it is not necessary to draw slowly with the Dataset arm it will produce a more accurate representation of the rim profile especially with rims having multiple steps or taper GSP9720JLR Wheel Bal...

Page 82: ...The user has the ability to change corrective weight location s Select Move Weight and change weight position with the control knob Push the control knob to switch between left and right weight planes Select Find Best Location to let the balancer decide what is the optimum corrective weight location If by chance the user selected weight positions are unacceptable Find Best Location will return the...

Page 83: ...on cannot be achieved or is undesirable turn the control knob to change the weight position As the position changes the SmartWeight force graphs will display a prediction of the force results corresponding to the weight 3 22 BDC Laser Adhesive Weight Locator Servo Activated Laser automatically locates BDC to aid in fast adhesive weight positioning During the mixed weights and adhesive weights bala...

Page 84: ...ameter 5mm at aperture Divergence 1 5mrad x 2rad Transverse Beam Mode TEM00 3 23 Optional HammerHead TDC Laser Adhesive Weight Locator The balancer will find the TDC for the left or right weight plane if Servo Stop is enabled Servo Stop will hold the wheel in the TDC position while the servo activated laser automatically locates TDC to aid in fast clip on weight positioning The HammerHead TDC Lase...

Page 85: ... Class 1M during all procedures of operation Never look directly into the laser Doing so may cause serious injury Operation accessible radiation fields Wavelength 635 660nm Laser Power for Classification 1mW via 7mm aperture Beam Diameter 5mm at aperture Divergence 1 5mrad x 2rad Transverse Beam Mode TEM00 GSP9720JLR Wheel Balancer Operation Instructions Balancing Procedures x 77 ...

Page 86: ...ensor Type x Reset Required on Tire Rotation or Replacement x Reset Tool Requirement x Required Tools x Reset Procedure x TPMS Hints x Information Disclaimers TPMSpecs may be accessed in two ways Option 1 From the Main Balance screen scan a VIN barcode TPMS information for the vehicle scanned will automatically be retrieve and display Option 2 From the Main Balance Logo screen press the menu key t...

Page 87: ...e wheel process scan tool and OEM scanner The red border yellow border or grayed appearance of the image denotes the requirement as required optional or not required Red and white striped border as in above TPMSpecs screen indicates the requirement is possibly required refer to the explanation below the images Scroll down by turning the control knob for detail TPMS information for the vehicle GSP9...

Page 88: ...80 x Balancing Procedures GSP9720JLR Wheel Balancer Operation Instructions ...

Page 89: ...lation Station page 106 The load roller can be enabled and disabled by turning the control knob When the load roller is enabled the LCD will display the load roller on the screen as shown below Road Force with Limits Enabled when the load roller selection is made LT Tires P SUV Tires or P Tires road force specifications can be highlighted by slowly turning the knob to the appropriate selection Cha...

Page 90: ...em the tire pressure will automatically be set to the target air pressure The target air pressure is set by the user by using the control knob In cases of a tire with pressure below 15 psi Auto Set Pressure can be selected to begin filling Press Hold pressure or STOP at any time to halt auto pressure setting Depending on how far off the pressure is and how large the tire the dialed in pressure wil...

Page 91: ...that the air pressure of the tire is set to specifications prior to the Road Force Measurement Incorrect tire pressure will affect the results If the GSP9720JLR is equipped with the Inflation Station feature the tire can be easily set to the specified air pressure before and after ForceMatching Refer to Inflation Station page 106 After measuring the assembly if it detects a Road Force Measurement ...

Page 92: ...e by using Forcematch Rotate the tire road force high spot on the wheel to TDC or with the hood in the raised position and the servo enabled press START Mark the tire with a piece of chalk or a marker at TDC If desired mark the tire with the ForceMatch Code Refer to Using ForceMatch Codes Feature page 86 NOTE When the wheel is rotated to TDC the chalk will appear green on the console display and t...

Page 93: ...embly from the balancer by selecting Show After Forcematching from the Balance primary screen If the wheel assembly cannot be corrected by Forcematching the diagnosis box will display Forcematching will not bring assembly within limits and may suggest component replacement Refer to Diagnosis Explanation Screen page 102 Forcematching is complete Forcematching Using Previous Bare Rim Measurement If ...

Page 94: ...m the balancer and set it on top of the tire with the valve stem VS mark on the tire aligned to the valve stem With the valve stem and valve stem VS mark aligned transfer the road force FV mark from the rim to the tire and label it FV Mount the tire on the rim with the road force FV mark on the tire and rim runout RR mark on the rim aligned Using ForceMatch Codes Feature When a tire or rim matchin...

Page 95: ...Indicators can be selected to remove the dial indicator gauges from the screen Rim runout and road force will still be graphically depicted on the screen Lateral Radial Rim High Spot Indicators Feature The Show Lateral High Spot s and Show Radial High Spot s softkeys are available to select a graphic depiction of the exact radial blue indicators or lateral orange indicators first harmonic runout h...

Page 96: ...ounting Lube During Mounting Lube is Good Proper lubrication on the tire bead and rim areas including bead seat hump balcony and drop center are vital in achieving proper seating of the tire bead to the wheel assembly Aggressive acceleration or braking should be avoided for the first 500 miles to prevent tire to wheel slippage x Rim Safety Hump Design Hangs Up Tire Bead During Bead Seating Some ty...

Page 97: ...nout After measuring rim runout results are shown on the Current Runout popup screen NOTE QuickMatch tire and wheel mounting procedure results and benefits are not computed until rim runout is measured The Current Runout screen will display a message informing you if using QuickMatch will be beneficial LATERAL RIM RUNOUT MEASUREMENT RADIAL RIM RUNOUT MEASUREMENT ASSEMBLY DIAGNOSIS Road Force Audit...

Page 98: ... be corrected by QuickMatch the results can be viewed prior to removing the assembly from the balancer by viewing the Current QuickMatch Measurements primary screen QuickMatch is complete QuickMatch Using Previous Bare Rim Measurement If bare rim measurements refer to Rim Runout Measurement Bare Rim page 65 have been taken and will be used for QuickMatch procedures it will be necessary to scribe t...

Page 99: ...ay the tire down on the floor x Remove the rim from the balancer and set it on top of the tire with the valve stem VS mark on the tire aligned to the valve stem x With the valve stem and valve stem VS mark aligned transfer the loaded runout TR mark from the rim to the tire and label it TR x Mount the tire on the rim with the loaded runout TR mark on the tire and rim runout RR mark on the rim align...

Page 100: ...h Spot s and Show Radial High Spot s softkeys are available to select a graphic depiction of the exact radial blue indicators or lateral orange indicators first harmonic runout high spot locations The high spots indicated are the high spots of the first harmonic NOT the T I R runout high spots The lateral radial high spots correspond to the lateral and radial first harmonic rim runout amounts on t...

Page 101: ...ead and rim areas including bead seat hump balcony and drop center are vital in achieving proper seating of the tire bead to the wheel assembly Aggressive acceleration or braking should be avoided for the first 500 miles to prevent tire to wheel slippage x Rim Safety Hump Design Hangs Up Tire Bead During Bead Seating Some types of wheels use a square safety hump that may further inhibit uniform ti...

Page 102: ...ufacturer AWD and 4WD drivetrains can vary greatly in their sensitivity to unequal tire diameters Consult the vehicle owner s manual for vehicle manufacturer s recommendations when replacing less than four tires If 4x4 or AWD vehicles manufacturer s recommendations are not available a good rule of thumb is that all tires should be within 0 30 diameter of each other IMPORTANT It is important to not...

Page 103: ... of vehicle pull and obtain the best straight ahead steering stability Pull or drift caused by the lateral forces can be systematically minimized offset or eliminated Performing a StraightTrak LFM Procedure Mount the tire wheel assembly centered on the shaft of the GSP9720JLR Use care to make sure the wing nut is well tightened Choose the appropriate balancing procedure for the particular type of ...

Page 104: ...ut is stored in memory for use on the Vehicle Plan View screen After wheel comes to a complete stop raise the safety hood Perform any tire wheel Force Matching required to reduce radial Road Force disturbances Apply the appropriate balance weight Press the Tire Tags softkey to number the tire wheel assembly The screen will default to tag 1 Press OK to accept tag 1 and continue Attach the correspon...

Page 105: ... vehicle plan view will reappear Refer to Vehicle Plan View page 98 The vehicle plan view will show suggested placement of the tire wheel assemblies so that the net lateral force produced by tire conicity exerted on the steer axle of the vehicle is minimized Press Exit to return to the balance screen Mount the fourth tire wheel assembly on the GSP9720JLR and perform Forcematching if needed and bal...

Page 106: ...heel assemblies are mounted on the vehicle as currently shown on the screen Direction will be to the right plus or to the left minus and further indicated by an arrow Magnitude is measured in pounds lbs or Newtons N and is further indicated by the length of the directional arrow While on the Vehicle Plan View pressing from the lower row of softkeys will keep the same amount of lateral pull but rev...

Page 107: ...ext sequential tag and pressing OK or by rotating the control knob to a previous Changing Tag Numbers before pressing OK A measured and tagged tire wheel assembly can be replaced by mounting a different tire doing the lateral force measurement procedure and then tagging the new tire wheel assembly with the same number as the assembly that is being replaced The new tire data will replace that of th...

Page 108: ...e vehicle that will yield the least vibration will be shown This positioning will place the tire wheel assembly with the greatest amount of road force on the passenger side of the rear axle farthest from the driver The tire wheel assembly with the second highest road force will be placed on the driver s side of the rear axle and the tire wheel assembly with the lowest road force will be placed on ...

Page 109: ...ernate Placements softkey Determining Tire Conicity Outliers Locating one or more tires with a large difference in conicity may be achieved by using the Show Details graph Locate one or more outliers by looking for high net pull examples when mixing tires Printout The printout serves both the technician and the customer If the GSP9720JLR is not equipped with a printer it is recommended that the te...

Page 110: ...sembly This is considered normal due to the green bar tolerance allowable during automatic inflation NOTE If the wing nut appears to be tight remove the wing nut and then clean and lubricate the spindle threads Refer to Spindle Hub Face and Shaft Maintenance page 131 4 7 Diagnosis Explanation Screen Limits Disabled After the Road Force Measurement and rim runout measurements have been taken the GS...

Page 111: ...you may select to Show Details The Details popup screen will present a charted depiction of each measured component and compare the measured data to the limits Components that are not within limits but are unlikely to cause vibration are shown in yellow Components that are not within the limits and may cause vibration will be shown in red NOTE Passenger car limits are more sensitive than light tru...

Page 112: ...up screen Show Runout Plots may be selected From this screen a graphic depiction of the measured data multiple harmonics road force and runout may be viewed Refer to Harmonics T I R Data Plots page 106 104 x Road Force Measurement Procedures GSP9720JLR Wheel Balancer Operation Instructions ...

Page 113: ...long as power is left on Imbalance condition static vs dynamic and balance weight types are printed Split and Spoke weight values are printed as the single weight equivalent better indication of imbalance since weight angles are not printed Tire runout and rim runout are not printed on the main printout page If this information is desired printing while in service mode will produce an additional p...

Page 114: ...o select to see plots of multiple harmonic vibrations for the assembly tire or rim Each time Show Next Harmonic is selected the next harmonic amount will be highlighted in color and the corresponding harmonic curve such as a twice per revolution wave representing the second harmonic will be plotted on the graph and sized according to the highlighted amount Viewing Multiple Revolutions The runout p...

Page 115: ...t from view This makes it easier to examine individual data or print a specific plot From the second menu row selections for multiple harmonics and multiple revolutions of data are available You may select to see any combination of data harmonics and revolutions desired For instance the plot below shows the four revolutions for the first harmonic for assembly loaded road force data 4 REVOLUTIONS O...

Page 116: ...amount will be highlighted in color and the corresponding harmonic curve will be plotted on the graph and sized according to the highlighted amount RIM SECOND HARMONIC BLUE From the first menu row you may select Show Load Roller to return to the load roller screen viewed prior to selecting the Show Rim key From the first menu row you may select Exit to return to the Current Runout Road Force scree...

Page 117: ...ce was measured columns 1 and 2 The Show More Statistics key can be selected to show second harmonic third harmonic and T I R results for all spins Column 5 rim average data will not be shown in these cases If the GSP9720JLR is equipped with StraightTrak LFM there will be a page of lateral force statistics following the T I R results Clear Data can also be selected key is only available in Service...

Page 118: ...110 x Road Force Measurement Procedures GSP9720JLR Wheel Balancer Operation Instructions ...

Page 119: ...llation Remove the rear cover from the support assembly for the LCD display by removing the six 8 screws Set the rear cover and attaching hardware aside Insert to program cartridge into the cartridge jack located on the side of the board within the support assembly Verify that program cartridge is fully seated PROGRAM CARTRIDGE INSTALLED SECURITY KEY INSTALLED GSP9720JLR Wheel Balancer Operation I...

Page 120: ...tkeys on the Logo primary screen As the set up features are individually highlighted by selecting n or p the equipment components for each set up procedure are shown in yellow on the illustrated GSP9720JLR Change set up features by selecting Set Up Selected Item The gray box at the top of the item set up menu displays the current setting for each feature The blue box in the middle of the set up sc...

Page 121: ...to automatically rotate the wheel to the next weight or ForceMatch Mark positions Pressing the START key may still be used for this function Balance Checkspin Enables or disables the load roller during balance verification spins When enabled the load roller will automatically disabled as necessary Weight Units Use Weight Units to select English or Metric units for displaying wheel weights NOTE Bal...

Page 122: ...pted Inflation Station Enables or disables the program to automatically prompt the user to set tire pressure Prompted Centering Checks Enables or disables the program to automatically prompt the user to perform a centering check on each wheel Runout Road Force Limits Selects the amount of road force and runout needed to exceed limits P Limits The control knob changes the P passenger tire limits Pu...

Page 123: ...cturers and are a conservative average Limits are used with the GSP9720JLR as a point of reference so that diagnostic messages guide the operator in decision making processes Do not use these limits as the only basis for a tire or wheel replacement It is up to the manufacturer of the tire or wheel to determine what is defective and what is acceptable if warranty returns become a concern Road force...

Page 124: ...the Static and Couple force limits will change to reflect those values Main Selections Setting Up the Weight Units Selects the corrective weight units as ounces or grams Setting Up the Ounce Round Amount Selects the amount to which ounce weights are rounded Ounce Round Amount options include 0 05 ounces and 0 25 ounces Setting Up the Gram Round Amount Selects the amount to which gram weights are r...

Page 125: ...ts and should not be changed except by qualified personnel for very specific reasons Force Limits can be adjusted for the up and down static force and the side to side couple force Any changes to the limits can be reset by selecting the Set Factory Defaults softkey Weightsaver Residual Goal Weightsaver residual goal is the percent of the shimmy force limit intentionally left in the assembly to sav...

Page 126: ... Enables the load roller or disables if no load roller is present HammerHead Setup options for the HammerHead option Road Force Audit Mode Enables Road Force Audit While in service mode select Quickmatch Select the last option which is Enabled with Road Force Save setup and return to balance screen 118 x Equipment Information GSP9720JLR Wheel Balancer Operation Instructions ...

Page 127: ... a reset is performed It provides a quick way to check the calibration of the force sensors used for balancing NOTE Quick Cal Check does not check the calibration of the Dataset arms or load roller The weight used for calibrating the balancer and the inner Dataset arm is stored on the back of the monitor support GSP9720JLR Wheel Balancer Operation Instructions Calibration and Maintenance x 119 ...

Page 128: ...Menu Select Calibrate from the Logo screen The Calibration Procedures primary screen contains a list box of calibration procedures As the procedures are individually highlighted by selecting n or p the equipment components to be calibrated for each procedure are illustrated on the GSP9720JLR image Select Show Calibration Data to view the specific details of each calibration procedure Calibration c...

Page 129: ...n weight and install calibration weight in the same hole on the opposite side of the faceplate by threading calibration weight clockwise into the hole Lower hood and press the green START button If calibration succeeds the LCD will display a Calibration Complete message If calibration fails such as if the weight was placed incorrectly during the procedure the GSP9720JLR will keep previous balancer...

Page 130: ...ming this procedure Press OK when calibration tool is installed Rotate the calibration tool slowly by hand clockwise until the GSP9720JLR beeps NOTE You may have to rotate the tool up to 1 1 2 turns Position the calibration tool parallel to the floor Tap the foot pedal once or press OK NOTE To verify that the tool is parallel to the floor measure from both ends of the calibration tool to the floor...

Page 131: ...hed tone will sound to advise that the step has NOT been entered Stabilize the arm and re enter the step Place the inner Dataset arm at upward position 2 Tap the foot pedal once or press Enter Cal Step Place the inner Dataset arm at upward position 3 Tap the foot pedal once or press Enter Cal Step GSP9720JLR Wheel Balancer Operation Instructions Calibration and Maintenance x 123 ...

Page 132: ...allel to the spindle shaft on the hub using the hub mounting slot as shown Place the inner Dataset arm at the position 7 Tap the foot pedal once or press Enter Cal Step Place the inner Dataset arm at the position 8 Tap the foot pedal once or press Enter Cal Step Place the inner Dataset arm at the position 9 Tap the foot pedal once or press Enter Cal Step Inner Dataset arm calibration is complete O...

Page 133: ...the calibration tool on the spindle shaft using the spindle shaft slot closest to the end of the calibration tool and hold in an upright position flat against the hub NOTE The calibration tool should be in full contact with the hub face but will allow a gap to exist between the tool and the hub face GSP9720JLR Wheel Balancer Operation Instructions Calibration and Maintenance x 125 ...

Page 134: ... by pulling the locator pin out of the locator slot and rotating the ball 180 degrees Secure the locking screw Place the calibration tool on the hub using the hub mounting slot as shown Place the outer Dataset arm ball in the hole for position 4 Tap the foot pedal once or press Enter Cal Step Place the outer Dataset arm at position 5 Tap the foot pedal once or press Enter Cal Step Place the outer ...

Page 135: ...nter the step Position the calibration tool on the spindle shaft using the middle spindle shaft slot Place load roller at position 2 Tap the foot pedal once or press Enter Cal Step Position the calibration tool on the spindle shaft using the spindle shaft slot closest to the center of the tool Place load roller at position 3 Tap the foot pedal once or press Enter Cal Step Reconnect the load roller...

Page 136: ...nter Cal Step to continue If the optional reference gauge is not available select Skip Cal Step Attach the inflation station hose to a wheel assembly with a verified inflation of at least 15 psi Select Enter Cal Step to proceed with test 128 x Calibration and Maintenance GSP9720JLR Wheel Balancer Operation Instructions ...

Page 137: ...e sole purpose of conveying information to the Hunter Service Representative The service representative may request information from these screens to diagnose service concerns The ability to convey diagnostic data to the representative prior to service expedite repair to the equipment Begin each highlighted diagnostic procedure by selecting Begin Selected Test To exit a diagnostic procedure select...

Page 138: ...clockwise movement Visual controls that are available are zoom pan left and pan right 6 3 Diagnostic Procedures Service Mode Enabled Loaded Runout Air Components Service Mode Only Measures forces exhibited by the air bag and inflation station Install a wheel assembly close the hood and select the desired option from the menu Motor Drive Service Mode Only Tests rpm s and torque of the motor drive c...

Page 139: ...es other than those specified herein may result in hazardous radiation exposure This Laser Product is designated as Class 1M during all procedures of operation Never look directly into the laser Doing so may cause serious injury Do not intentional use a reflective device to enhance or re direct the laser Do not operate the laser if the cover or seal is damaged There is no required maintenance or s...

Page 140: ... serviceable parts The unit should never be opened or modified 6 6 Mounting Cone Maintenance Keep the mounting cones clean and lubricated Lubricate with a coating of light lubricant with Teflon such as Super Lube by Loctite Do not use cones in any way that is not described in this operation manual This could cause damage to the mounting cone and not allow for proper mounting of the wheel 132 x Cal...

Page 141: ...e Mounting Error Brake Component Wear or Failure Drivetrain or Engine Component Wear or Failure Vehicle Component Characteristics Combination of Some or All Factors Factors not detected by the GSP9720JLR Series Road Force Measurement System A vibration that occurs one time for every revolution is defined as a first harmonic vibration GSP9720JLR Wheel Balancer Operation Instructions Theory of Opera...

Page 142: ... second harmonic vibration Because there are two vibrations per revolution the second harmonic vibration occurs at twice the frequency of a first harmonic vibration Multiple harmonic vibrations may also occur For instance the third order vibration causes a three times per revolution vibration Multiple harmonic vibrations may occur at any harmonic factor dependant only upon the number of vibration ...

Page 143: ...ped tire wheel assembly can be balanced about its axis but an egg shaped tire wheel loaded against a surface would not give a smooth ride The GSP9720JLR reduces diagnostic time by identifying vibrations that would not be detected by the normal balancing procedure Road Force Measurement also detects loaded and free measured runout force variation of the tire and balancer mounting error allowing sup...

Page 144: ... Refer to Rim Runout Measurements page 63 When the rim runout data is entered the GSP9720JLR extracts and displays the first harmonic force variation contribution of the tire and of the rim Refer to Harmonic Vibrations page 133 The GSP9720JLR allows the first harmonic of the tire to be matched opposite of the first harmonic of the rim to decrease the first harmonic vibration The tire and or rim ma...

Page 145: ...heel with the effects of the tire s overall stiffness Eccentricity when stated in terms of runout alone does not quantify the actual force because the force is dependent on the stiffness of the tire being measured Runout does not necessarily create the same force from tire to tire For example two tires with the same runout will differ in their ability to create vibration when a stiff tire sidewall...

Page 146: ...en unloaded runout is measured Unloaded runout measurement can not indicate how much force is being created as a result of the runout since the tire stiffness can not be measured Tire shoulders and other areas not measured may amplify or diminish the runout and forces when measured under load Summarization Force The forces generated by a tire and wheel must be measured by placing a tire under load...

Page 147: ... is not as valuable as tire force variation when it comes to analyzing the causes of tire ride disturbances In the past when trying to resolve tire wheel vibration concerns service facilities were unable to measure tire force variation The size and expense of the factory machines were cost prohibitive In order to compensate for this lack of field service technology many automotive and tire manufac...

Page 148: ...ift from a straight line Frequently the cause of this pull is excessive difference in lateral force between the tires on the steer axle This optional feature measures the lateral forces of the tire wheel assembly and suggests placement of each tire wheel assembly relative to the other tire wheel assemblies on the vehicle so that vehicle pull due to tire lateral forces may be minimized or eliminate...

Page 149: ...and reduction in wandering Reduction of driver fatigue due to pull When should StraightTrak LFM be used Tire mounting and balancing processes Tire rotations Alignment services How is StraightTrak LFM used Determine minimum lateral force offset on a steer axle to reduce eliminate tire related pull conditions The least net tire pull in most cases will yield the best results Diagnose residual pull sy...

Page 150: ... the same vehicle It is the net difference between the two tires on the steering axle that make the difference between a vehicle that rolls straight and one that drifts or pulls Conicity in tires may be caused when the radial belts vary from exact placement in the center of the tire carcass during construction The sidewall to which the belts are placed closer will be stiffer and thus taller than t...

Page 151: ... in a tire or a mismatched set of tires Another common factor that can affect steering pull or drift in relation to the tires is the variation in air pressure of the two tires when compared side to side on a given axle Tire pressure measurement is prompted with a pop up screen before every load roller measurement GSP9720JLR Wheel Balancer Operation Instructions Theory of Operation x 143 ...

Page 152: ...144 x Theory of Operation GSP9720JLR Wheel Balancer Operation Instructions ...

Page 153: ...ze or always remain seated improperly unless the tire is demounted lubricated and remounted However the load force and its relatively short duration will not necessarily solve defective mounting of the tire bead seat to the rim seat Blinding and Rounding Blinding is a set amount if imbalance required before an indication of imbalance is displayed Rounding sets the weight increments to specific amo...

Page 154: ...re s radial force variation with the low spot of rim runout to decrease rolling vibration in the wheel assembly Forced Vibration Vibrates when energy is applied Free Vibration Continues to vibrate after the outside energy stops Frequency The number of disturbances that occur per unit of time Front Coning When the wheel requires the cone to center the wheel on the balancer s shaft from the front Al...

Page 155: ...curs twice per cycle P P SUV LT P Tires refers to passenger tires LT Tires refers to light truck tires and P SUV Tires refers to P Rated sport utility vehicle tires Patch Balance Method of balancing that balances weighted rubber patches applied to the inside of a tire PAX A specifically designed wheel tire assembly that does not use the traditional rim lip bead design PAX assemblies require adhesi...

Page 156: ...wheel assembly as would be found from an actual road test of a vehicle The GSP9720JLR is equipped with a load roller to take the Road Force Measurement The load roller places up to 1400 pounds of force on the spinning tire and automatically measures the effects of loaded runout and tire stiffness to emulate tire wheel assembly force variation Loaded runout of rim and tire stiffness calculated equa...

Page 157: ...l Indicated Reading T I R Data measurements taken by the load roller measured in lbs or kg or Dataset Arms measured in inches or millimeters representing the actual runout measured The T I R data represents the difference in value between the highest and lowest value measured Transference Path The object s that transfers the frequency Vibration A shaking or trembling which may be heard or felt Wei...

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