Grizzly G0866 Скачать руководство пользователя страница 5 | Manualshive

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Grizzly G0866 Скачать руководство пользователя страница 5

Model G0866 (Mfd. Since 11/18)

-3-

Identification

Become familiar with the names and locations of the controls and features shown below to better understand
the instructions in this manual.

Control Panel

Air Regulator/

Filter Valve

Access Door

Conveyor

Feed Motor

Conveyor

Table

Dust Ports

Feed Motor

Gearbox

EMERGENCY

STOP!

Plate

Conveyor

Belt

Table

Elevation

Handwheel

Upper Roller

Oscillation

Timing

Knob

Belt

Tension

Knob

Platen

Height Dial

Platen Height

Gauge

Lock Post

Release

Lever

Drum Height

Adjustment

Bolt

Drum Height

Locking Bolt

Diaphragm Valve

Assembly

Air Fork

& Air Jet

Belt Tracking

Limit Switch

Belt Tension

Limit Switch

Oscillation

Airflow & Speed

Controls

«
...
3
4
5
6
7
...
»

Содержание G0866

Страница 1: ...O PORTION OF THIS MANUAL MAY BE REPRODUCED IN ANY SHAPE OR FORM WITHOUT THE WRITTEN APPROVAL OF GRIZZLY INDUSTRIAL INC CS20266 PRINTED IN TAIWAN V1 03 21 MODEL G0866 37 WIDE BELT SANDER w INDUSTRIAL R...

Страница 2: ...g grinding tool integrity and the usage of personal protective equipment The manufacturer will not be held liable for injury or property damage from negligence improper training machine modifications...

Страница 3: ...ibrating Digital Display 48 Adjusting Belt Tracking Limit Switches 48 Adjusting Oscillation Timing Speed 49 Servicing Platen 51 Checking Replacing Brake Pads 52 Checking Adjusting Table Parallelism 55...

Страница 4: ...de every effort to be exact with the instruc tions specifications drawings and photographs in this manual Sometimes we make mistakes but our policy of continuous improvement also means that sometimes...

Страница 5: ...Door Conveyor Feed Motor Conveyor Table Dust Ports Feed Motor Gearbox EMERGENCY STOP Plate Conveyor Belt Table Elevation Handwheel Upper Roller Oscillation Timing Knob Belt Tension Knob Platen Height...

Страница 6: ...ted to power I Front Sanding Belt Stop Button Turns front sanding belt motor OFF when pressed J Rear Sanding Belt Stop Button Turns rear sanding belt motor OFF when pressed K Conveyor Belt Stop Button...

Страница 7: ...moves the table approximately 0 20 Q Conveyor Table Supports workpiece dur ing operations can be raised and lowered according to workpiece thickness Table Figure 4 Table components O Q N P Digital Co...

Страница 8: ...D AF Y Platen Height Gauge Indicates height of platen above or below sanding drums Z Platen Height Dial Adjusts platen height for three basic types of sanding the initial heavy sanding pass the interm...

Страница 9: ...e Content Machine Weight 3968 lbs Length x Width x Height 72 x 63 x 85 in Must Ship Upright Yes Electrical Power Requirement 220V or 440V 3 Phase 60 Hz Prewired Voltage 220V Full Load Current Rating 7...

Страница 10: ...0 Rear 2800 FPM Conveyor Feed Rate 7 68 FPM Sandpaper Length 75 in Sandpaper Width 37 in Drum Information Infeed Sanding Drum Type Spiral Grooved Rubber Roller Infeed Sanding Drum Size Front 8 7 Rear...

Страница 11: ...ry of Origin Taiwan Warranty 1 Year Approximate Assembly Setup Time 2 Hours Serial Number Location Machine ID Label ISO 9001 Factory Yes Features Dual Drum Motors Amp Meter Load Sensing System Powered...

Страница 12: ...d proof DANGEROUS ENVIRONMENTS Do not use machinery in areas that are wet cluttered or have poor lighting Operating machinery in these areas greatly increases the risk of accidents and injury MENTAL A...

Страница 13: ...moving parts or flying debris Make sure they are properly installed undamaged and working correctly BEFORE operating machine FORCING MACHINERY Do not force machine It will do the job safer and better...

Страница 14: ...ween workpiece and conveyor can result in pinching injuries or possibly getting trapped and pulled into sanding area of machine DO NOT place fingers under bottom of workpiece while feeding it into san...

Страница 15: ...loading the machine during operation and make sure it is connected to a power supply circuit that meets the specified circuit requirements Circuit Requirements for 440V This machine can be converted...

Страница 16: ...ccordance with all applicable electrical codes and ordinances Serious injury could occur if you connect machine to power before completing setup process DO NOT connect to power until instructed later...

Страница 17: ...ed service personnel If at any time during this procedure assistance is needed call Grizzly Tech Support at 570 546 9663 Items Needed Qty Phillips Head Screwdriver 2 1 Schneider LRD325 Overload Relays...

Страница 18: ...U5 U1 V2 V5 U5 U2 V6 V1 V1 V5 U5 U2 V6 V2 U1 U6 U1 V1 V1 V5 U5 U2 V6 V2 U1 U1 V1 Jumper To Electrical Box FRONT MAIN MOTOR 220V W2 V W U W1 W2 W6 V W U W5 W1 U6 W5 W6 U6 V6 Motor Rewired for 440V To...

Страница 19: ...pers as shown in Figure 23 FEED MOTOR 220V W2 W2 W1 FEED MOTOR 440V W2 W2 W1 Motor Rewired for 440V To Electrical Box U2 V2 V1 U1 U2 V2 U2 V2 V1 U1 U2 V2 Figure 23 Feed motor wired for 440V 20 Close f...

Страница 20: ...Cleaner As Needed Shop Rags As Needed Disposable Gloves As Needed Lifting Equipment Rated for at least 4000 lbs 1 Machinist s Precision Level 1 Floor Mounting Hardware As Needed 42 Long 2x4 1 Dust Ho...

Страница 21: ...hese items get lost in packaging materials while unpack ing or they are pre installed at the factory Figure 24 Loose item inventory A B C D E F G H I J K L M N O P Q Box Contents Figure 24 Qty A Flat...

Страница 22: ...g gather the following Disposable rags Cleaner degreaser WD 40 works well Safety glasses disposable gloves Plastic paint scraper optional Basic steps for removing rust preventative 1 Put on safety gla...

Страница 23: ...manual See below for required space allocation Physical Environment The physical environment where the machine is operated is important for safe operation and lon gevity of machine components For bes...

Страница 24: ...Figure 27 Mounting hardware and leveling bolts right side shown x 4 Do not attempt to lift or move this machine without using the proper lifting equipment such as forklift or crane Each piece of lift...

Страница 25: ...ield Anchor Flat Washer Drilled Hole Figure 30 Popular method for anchoring machinery to a concrete floor Anchoring to Concrete Floors Number of Mounting Holes 4 Diameter of Mounting Hardware 1 2 Leve...

Страница 26: ...it until gauge reads 75 PSI Note Rotate knob clockwise to increase air pressure and counterclockwise to decrease 5 Push knob down until it snaps to lock knob 6 With machine connected to air open left...

Страница 27: ...ckwise direction during installation Failure to install sanding belt correctly will result in damage to sanding belt 9 Install sanding belt on upper roller and lower roller starting with upper making...

Страница 28: ...illness Reduce your risk by wearing a respirator and capturing the dust with a dust collection system Figure 38 Dust hoses attached to dust ports 2 Tug each hose to make sure it does not come off Note...

Страница 29: ...ing next step make sure incoming ground wire is connected to correct terminal to ensure machine will be properly grounded see Ground Terminal in Figure 40 An ungrounded or improperly grounded machine...

Страница 30: ...ow The machine is now connected to the power source Connecting to Power Source Figure 42 Disconnecting power from machine Move the disconnect switch handle to the OFF position as illustrated below The...

Страница 31: ...erify power supply is connected to machine with correct polarity by pressing Table Up and Table Down keys respec tively see Figure 45 Test Run Once assembly is complete test run the machine to ensure...

Страница 32: ...test rear main motor and feed motor see Figure 46 Both should run smoothly and without unusual problems or noises Belt should move away from operator and toward sanding drums while feed motor is runni...

Страница 33: ...tion Grizzly Industrial will not be held liable for accidents caused by lack of training To complete a typical operation the operator does the following 1 Examines workpiece to verify it is suitable f...

Страница 34: ...ry Sanding Workpieces The sanding process is influenced by the feed rate sanding depth grit size and material type of sandpaper platen position and oscillation speed We strongly recommend that you exp...

Страница 35: ...001 Down 1mm Wood Hardness Platen Settings 33 FPM Grit Size Hard Soft Max DOC Position 60 0 020 0 030 n a Up 1 5mm 80 0 015 0 025 n a Up 1 5mm 100 0 010 0 015 0 005 Even 120 0 007 0 010 0 005 Even 150...

Страница 36: ...and cost you more money over time Only sand with as slow of feed speeds as necessary to meet your sanding goals In other words avoid running the sander faster than is necessary Increasing feed speeds...

Страница 37: ...t numbers in incre ments of 50 or less Note Sandpaper finer than 180 grit will easily load up or burn workpieces Installing Changing Sanding Belts To install sanding belts 1 Start air compressor 2 DIS...

Страница 38: ...scratch patterns that create a smoother finish Due to the cushioned construction the platen is less likely to leave belt splice or chatter marks 7 Install sanding belt on upper roller and lower rolle...

Страница 39: ...e height handwheel or Table Up button to adjust the sand ing depth during the final sanding pass the platen movement alone will take care of the depth of cut Typically the final sanding pass position...

Страница 40: ...e motors from overloading during sand ing operations They should not be used as the main method for controlling sanding belt mate rial removal rates doing so can result in belt loading burning and eve...

Страница 41: ...H8846 60 Grit H8847 80 Grit H8848 100 Grit H8849 120 Grit H8850 150 Grit H8835 60 Grit 3 Pk H8836 80 Grit 3 Pk H8837 100 Grit 3 Pk H8838 120 Grit 3 Pk H8839 150 Grit 3 Pk Sanding Belts 37 x 75 Sanding...

Страница 42: ...igure 61 Model D2274 Shop Fox 5 Roller Stand order online at www grizzly com or call 1 800 523 4777 Figure 62 Model H4228 Anti Fatigue Mat H4228 Anti Fatigue Mat 24 x 36 Reduce work related aches and...

Страница 43: ...ngs on conveyor belt roller axles and sanding belt axles Page 42 Monthly Check V belt tension damage or wear Clean vacuum dust build up from inside cabi net and off motors Grease table elevation chain...

Страница 44: ...e fittings clean with a rag Attach a flexible grease gun extension to a grease gun Add one or two pumps of grease to the grease fitting located on the conveyor belt roller axles and the sanding belt r...

Страница 45: ...mptying Dust and Water Traps Three collection traps on this sander need to be emptied regularly DO NOT allow any of these traps to become full or you risk serious damage to your machine The air pressu...

Страница 46: ...the Pneumatic System Diagram on Page 66 Adjust regulator to approximately 75 PSI Carefully inspect all air lines for cracks chaf ing or hardening Replace faulty hoses Check air connections for leaks...

Страница 47: ...rcuit is free of shorts Reset circuit breaker or replace fuse 5 Free stuck switch replace 6 Adjust table to correct height replace switch 7 Center sanding belt so it is not touching limit switches adj...

Страница 48: ...ged 1 Clean replace sanding belt Pages 35 44 2 Clean repair pressure rollers Lines across width of workpiece 1 Sanding belt seam open damaged 2 Platen set too low 1 Replace sanding belt Page 35 2 Rais...

Страница 49: ...g belt will not start but conveyor will 1 No air pressure to sander 2 Airflow adjustment valve closed 3 Limit switches engaged 4 Sanding belt not tensioned 1 Connect sander to compressed air system Pa...

Страница 50: ...e stops if the belt travels too far to one side during oscillation see Figure 73 Tools Needed Qty Open End Wrench 12mm 1 Figure 73 Tracking limit switch adjustment bolt 1 of 4 Adjustment Bolt Location...

Страница 51: ...tracks away from air fork and air jet colliding into limit switch proceed to Setting Correct Airflow Figure 75 Oscillation components An adequate stream of air through the air fork gap is essential f...

Страница 52: ...Figure 78 Speed adjustment components 2 Turn speed adjustment knob clockwise to decrease oscillation speed and counterclock wise to increase 3 Tighten lock nut to secure speed adjustment Oscillation s...

Страница 53: ...Install new graphite pad on platen and secure pad with pressure plate and screws removed previously Tip If new pad does not have any mounting holes lay old pad over new pad mark mount ing holes then d...

Страница 54: ...r pressure in machine by opening air valve on regulator see Figure 84 This will cause disc brake assembly to open allowing removal Figure 83 Locations of brake pads on disc brake assembly Outer Brake...

Страница 55: ...rake assembly away from rotor Figure 85 Location of disc brake assembly mounting fasteners Mounting Fasteners 1 of 2 7 Remove 1 cap screw then remove inner brake pad see Figure 88 Figure 89 Location o...

Страница 56: ...e first 18 Close lower right access door 19 Connect air supply to air regulator and machine to power and start sander to test Emergency Stop system to make sure brake works Figure 93 Order of assembly...

Страница 57: ...elevation sprockets 1 of 4 shown Table Elevation Sprocket 1 of 4 Checking Adjusting Table Parallelism Table parallelism has been adjusted at the fac tory and should not require adjustment when the ma...

Страница 58: ...ood block If the measurement of any corner from Step 6 is not exactly the same as the length of the wood block measured in Step 4 the table is not parallel to the frame DO NOT remove wood block Procee...

Страница 59: ...ou want to adjust so only that sprocket can be moved independent of chain 11 Carefully rotate sprocket just enough to posi tion next tooth at marked location from Step 7 then fit chain around sprocket...

Страница 60: ...ble beyond this point 5 Close upper right access door 6 Connect machine to power and make note of workpiece thickness then lower table 0 035 This is how much lower infeed and outfeed pressure rollers...

Страница 61: ...les such as feed rate depth of cut and type of sanding belt can play a big part in determining proper amount of downward pressure exerted by rollers Some experimentation may be necessary to achieve de...

Страница 62: ...a matched set 5 Rotate V belt tension adjustment nuts to raise or lower motors until there is approxi mately 1 2 3 4 deflection when V belts are pushed with moderate pressure then tighten jam nut to s...

Страница 63: ...entric shaft and tube in place for front rubber roller see Figure 108 Figure 108 Eccentric tube cap screws location Cap Screw 1 of 3 Eccentric Shaft Tube Adjustment Nut Jam Nut Main Motor V Belt Figur...

Страница 64: ...er roller pulleys and then loop other end of V belts around motor pulleys see Figure 112 Figure 111 Location of bottom bearing housing hex bolts and washers x 4 11 Remove 8 hex bolts and flat washers...

Страница 65: ...e left adjustment bolt see Figure 114 clockwise 2 Run conveyor belt for 3 5 minutes and recheck tracking 3 Repeat Steps 1 2 as necessary until con veyor belt is properly tracking Note The edge of the...

Страница 66: ...nting screws and remove EMERGENCY STOP push panel assembly 8 Insert two 8 2x4s wooden studs under table for support then have lifting assistant help lift table slightly and move it out of rear of mach...

Страница 67: ...Model G0866 Mfd Since 11 18 65 Figure 117 Conveyor belt removal sequence 1 3 5 6 WARNING DISCONNECT POWER 2 8 7 9 10 Table Guide Tracking Adjustment Bolts 4 Conveyor Belt Removal Sequence...

Страница 68: ...66 Model G0866 Mfd Since 11 18 Pneumatic System Diagram Piston Solenoid Brake Cylinder Switch Regulator Cylinder Fork Diaphragm Manifold 1 Manifold 2...

Страница 69: ...Figure 120 Diaphragm Figure 121 Brakes Solenoid To Solenoid Compressor In To Diaphragm To Manifold 1 From Manifold 1 Figure 122 Piston and cylinder From Manifold 1 From Cylinder Switch To Manifold 1...

Страница 70: ...t at the time of printing but may not match your machine If you find this to be the case use the wiring diagram inside the motor junction box CAPACITORS INVERTERS Some capacitors and power inverters s...

Страница 71: ...pply Input Page 70 3 Control Panel Page 77 11 Electrical Box Page 73 4 EMERGENCY STOP Plate Limit Switch Page 78 12 Table Elevation Motor Page 76 5 Sanding Drum Motors Page 75 13 Table Elevation Limit...

Страница 72: ...veyer Feed Speed Sensor Sanding Drum Motor Sanding Drum Motor Amp Meters Voltmeter Table Elevation Motor Conveyer Feed Motor Sanding Belt Tracking Tension Limit Switches EMERGENCY STOP Plate Limit Swi...

Страница 73: ...Model G0866 Mfd Since 11 18 71 READ ELECTRICAL SAFETY ON PAGE 68 Electrical System Wiring Schematic...

Страница 74: ...G0866 Mfd Since 11 18 READ ELECTRICAL SAFETY ON PAGE 68 Electrical Box Terminal Bars Transformer Amperage Gauges Relays Fuses Relay Contactors Contactors Power Supply Terminals Figure 123 Inside elect...

Страница 75: ...Model G0866 Mfd Since 11 18 73 READ ELECTRICAL SAFETY ON PAGE 68 Electrical Box Wiring Schematic 220V Figure 124 Location of 220V power supply terminal on transformer 220V Terminal...

Страница 76: ...74 Model G0866 Mfd Since 11 18 READ ELECTRICAL SAFETY ON PAGE 68 Electrical Box Wiring Schematic 440V Figure 125 Location of 440V voltage conversion terminal on transformer 440V Terminal...

Страница 77: ...1 Motor Junction Box 2 Access Panel To Electrical Box FRONT MAIN MOTOR 220V W2 V W U W1 W2 W6 V W U W5 W1 U6 W5 W6 U6 V6 Motor Rewired for 440V To Electrical Box W2 W1 W2 W6 W5 W1 U6 W5 W6 Motor Rewir...

Страница 78: ...tion box Figure 129 Feed motor junction box W3 W5 W1 W2 TABLE ELEVATION MOTOR 440V W3 W1 W2 TABLE ELEVATION MOTOR 220V W5 Motor Rewired for 440V To Electrical Box U2 V2 V3 V5 V1 U1 U5 U3 U2 V2 V3 V5 V...

Страница 79: ...Model G0866 Mfd Since 11 18 77 READ ELECTRICAL SAFETY ON PAGE 68 Control Panel Meters Wiring Figure 131 Back of control panel Figure 130 Back of 1st amp meter...

Страница 80: ...Limit Switches Sensors Wiring Figure 132 Belt tension and tracking limit switches Figure 133 Table elevation limit switches and conveyer feed speed sensor Belt Tension Limit Switch Belt Tracking Limit...

Страница 81: ...ure 134 EMERGENCY STOP plate limit switch Figure 135 Table elevation proximity switch Air Pressure Limit Switch Wiring Air Pressure Limit Switch To Electrical Box Figure 136 Air pressure limit switch...

Страница 82: ...LATEN REMOVAL TOOL 10 P08660010 WRENCH 8 X 10MM OPEN ENDS 2 P08660002 LIMIT SWITCH TIP CERAMIC 11 P08660011 WRENCH 12 X 14MM OPEN ENDS 3 P08660003 TOOL BOX 12 P08660012 WRENCH 17 X 19MM OPEN ENDS 4 P0...

Страница 83: ...1141 1102 1107 1106 1104 1108 1105 1109 1114 1115 1116 1118 1113 1110 1112 1111 1117 1134 1106 1104 1103 1101 1126 1140 1138 1139 1121 1123 1310 1122 1311 1308 1301 1 1313 1306 1305 1304 1303 1301 130...

Страница 84: ...R FAN 1110 P08661110 PULLEY 2 GROOVE 1141 3 P08661141 3 MOTOR JUNCTION BOX 1111 P08661111 CAP SCREW 3 8 18 X 1 1 4 1301 P08661301 BRAKE CALIPER 1112 P08661112 LOCK WASHER 3 8 1301 1 P08661301 1 BRAKE...

Страница 85: ...2107 2406 2105 2106 2111 2410 2408 2407 2406 2401 2406 2404 2334 2403 2405 2402 2409 2329 2324 2337 2335 2336 2338 2306 2340 2317 2307 2310 2311 2321 2320 2332 2319 2318 2312 2313 2309 2314 2308 2307...

Страница 86: ...06 SPROCKET WHEEL 2333 P08662333 HEX BOLT 1 2 12 X 4 1 2 2301 P08662301 ELEVATION GEARBOX 2334 P08662334 PROXIMITY SWITCH PLATE 2302 P08662302 WORM GEAR WHEEL 2335 P08662335 HEX BOLT 1 4 20 X 1 2 2303...

Страница 87: ...4 X 1 1 2 3109 P08663109 GEARBOX 3144 P08663144 HEX BOLT 1 2 13 X 5 5 16 3111 P08663111 GEARBOX PLUG 3145 P08663145 LOCK WASHER 10 3112 P08663112 MOUNTED BEARING UCF205 3150 P08663150 SENSOR PLATE 311...

Страница 88: ...UT 5 16 18 4302 P08664302 PISTON BRACKET OUTER 4108 P08664108 HEX BOLT 5 16 18 X 1 1 4 4303 P08664303 ROLL PIN 3 X 27 4109 P08664109 LOCK WASHER 5 16 4304 P08664304 PISTON BRACKET INNER 4201 P08664201...

Страница 89: ...4 5115 5119 5120 5116 5121 5122 5123 5112 5118 5117 5127 5128 5129 5110 5111 5207 5208 5139 5205 5106 5206 5204 5214 5209 5210 5211 5201 5212 5208 5118 5117 5304 5303 5306 5305 5302 5301 5308 5310 531...

Страница 90: ...0 X 1 2 5305 P08665305 PHLP HD SCR 10 24 X 1 2 5115 P08665115 BEARING HOUSING LEFT FRONT 5306 P08665306 GRAPHITE RETAINER PLATE 5116 P08665116 BEARING HOUSING PAD RUBBER 5307 P08665307 PLATEN GEARBOX...

Страница 91: ...6129 6118 6119 6120 6114 6130 6131 6131 6116 1 6131 6112 6132 6130 6131 6325 6111 6113 6116 6326 6117 6137 6115 6110 6104 6306 6131 6323 6327 6139 6205 6208 6204 6203 6207 6206 6128 6131 6132 6203 62...

Страница 92: ...1 LIMIT SWITCH TUBE PLASTIC 6302 P08666302 ECCENTRIC ROD 6117 P08666117 LIMIT SWITCH MOUNTING BRACKET 6303 P08666303 CAP SCREW 1 2 12 X 3 1 2 6118 P08666118 AIR FORK JET 6304 P08666304 FLAT WASHER 1 2...

Страница 93: ...9 P08667109 DOOR RIGHT LOWER FRAME 7102 P08667102 REGULATOR DOOR 7110 P08667110 FLAT WASHER 1 4 7103 P08667103 PHLP HD SCR M6 1 X 12 7111 P08667111 FRONT PROTECTION PLATE 7104 P08667104 DOOR LEFT UPPE...

Страница 94: ...106 8105 8117 8111 8115 8112 8114 8134 8110 8109 8104 8118 8115 8126 8135 8136 8107 8108 8129 8139 8140 8131 8128 8137 8138 8130 8133 8109 8111 8112 8134 8122 8123 8143 8143 1 8143 2 NO NC 1L1 3L2 5L3...

Страница 95: ...BOARD DP 515 8109 P08668109 CURRENT SENSOR RCT75 5 8134 P08668134 CONTACTOR SCHN LC1D09M7 AC220V 8110 P08668110 TRANSFORMER 350VA 440 8135 P08668135 AMP METER ANALOG 75 5A 8111 P08668111 CONTACTOR SC...

Страница 96: ...2 9120 9132 9131 9113 9112 9111 9114 9115 9133 9134 9119 9136 9138 9117 9116 9137 9135 9115 9116 9125 9118 9128 9127 9101 IN 9105 9106 9107 9104 9103 9102 9110 9129 9108 9109 9125 9121 9140 9139 9113...

Страница 97: ...I 7 9 220V 9131 P08669131 FLEXIBLE HOSE 6 X 1600MM 9110 P08669110 T CONNECTOR 1 4N X 1 4T MALE 9132 P08669132 FLEXIBLE HOSE 6 X 750MM 9111 P08669111 CONNECTOR 9133 P08669133 FLEXIBLE HOSE 6 X 650MM 91...

Страница 98: ...ure to do so could seriously damage machine NOTICE On junction boxes REF PART DESCRIPTION REF PART DESCRIPTION 9201 P08669201 POSITION PLATE NOTICE LABEL 9211 P08669211 STOP REMOVE BELTS HANG TAG 9202...

Страница 99: ...rty or for incidental contingent special or consequential damages arising from the use of our products The manufacturers reserve the right to change specifications at any time because they constantly...

Страница 100: ......

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