US Praxis PRX130 Owner'S Manual Download Page 17 | Manualshive

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US Praxis, Inc. – Copyright 2009

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All rights reserved

17

CONTROLS

 Continued 

Centrifugal clutch:

The engine is equipped with a centrifugal clutch that
is connected to the crankshaft. When the engine
speed increases, the drive for cutting wheel engages
automatically. The centrifugal clutch is
maintenancefree; it is not possible for the user to
make adjustments.

Throttle:

The lever controls engine speed.
With the lever down, the engine runs at idle and functions as start position.
When the engine speed increases, the centrifugal clutch drive automatically engages the cutting
wheel.

Brake:

The lever activates a disk brake on the left wheel when it is pulled backwards. The brake should
always be activated when operating the grinder, when it is parked and when it is being
transported.

NEVER operate a machine with a defective brake.

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Summary of Contents for PRX130

Page 1: ...s Inc Copyright 2009 All rights reserved 1 PRX90 PRX130 OPERATIONS OWNERS MANUAL US Praxis Inc 955 W Prairie Drive Sycamore IL 60178 Toll Free 888 316 8200 Ph 815 899 9700 Fax 815 899 9709 Web www uspraxis com ...

Page 2: ...ine 18 Before you Start 18 Starting the Engine 19 Fuel Valve 19 Choke Control 19 Throttle Grip Handle 19 Starter Handle 20 Grinding the Stump 21 Normal Shutdown 22 Maintenance 24 Maintenance Schedule 24 Cleaning the Filter 25 Replacing the Filter 26 Cleaning the Sludge Reservoir 27 Idle Adjustment 27 Ignition System 28 Cutting Blade 29 Sharpening Cutting Blades 30 Brake Adjustment 31 Two Minute Ru...

Page 3: ...insurance coverage for your new machine You should have all inclusive insurance for liability fire damage and theft Good service Praxis products are sold all over the world and only in specialized retail trade with complete service This ensures that you as a customer receive only the best support and service Before the machine was delivered it underwent inspection and was adjusted by your dealer W...

Page 4: ...sense To obtain extra copies of the operator s manual please contact your dealer or the manufacturer IMPORTANT INFORMATION Do not use the machine until you have read the operator s manual carefully and understand the instructions given All maintenance work or adjustments not described in this manual must be performed by an authorized Praxis service provider The stump grinder can be dangerous if us...

Page 5: ...e machine for removing tree stumps and exposed root systems It is not intended for any other use Ø Check that the machine is in serviceable condition prior to use see the chapter Maintenance and Trouble Shooting Ø Only use the machine in daylight or in other well lit conditions Keep the machine a safe distance from holes or other irregularities in the ground Pay attention to other possible risks Ø...

Page 6: ...posure to vibration Examples of common symptoms include numbness pain muscle weakness change of skin color or an uncomfortable feeling of tingling These symptoms appear most frequently in the fingers hands or wrists IMPORTANT INFORMATION Never use a stump grinder that is damaged or incorrectly adjusted Never use the stump grinder if any component is missing or if it is not properly assembled Check...

Page 7: ...orking properly Ø Make sure no clothing long hair or jewelry can catch in moving machine parts Ø Check that all safety decals are in place See the chapter Location of decals Ø Use mouth protection protective gloves with good grip and protective clothing which you can move unrestricted Also use leg protection to protect your legs from sparks and the cutting tools Ø Never use the machine when barefo...

Page 8: ...ut back to object with a power saw Hence it is appropriate to use personal protective equipment that fulfils requirements for working with both stump grinders and power saws The main difference is that you should wear protective glasses when operating the stump grinder while the wire mesh visor gives sufficient protection when using a power saw Thus when using the stump grinder we recommend using ...

Page 9: ...body parts of your body to gain greater bearing pressure against the stump Ø Smoking open flames or sparks in the vicinity of the machine are strictly forbidden Gasoline is extremely flammable and carelessness in handling can result in personal injury or fire Ø Never use a machine with a deflective muffler Ø In very warm and dry climates stump grinder operation poses a risk of forest fires Ø Stop ...

Page 10: ...g unloading the machine Ø We recommend having two people to lift the machine Ø Activate the parking brake during transport Ø Fasten the machine properly in place with approved fasteners such as tension belts chains or rope Always check that you are in compliance with applicable traffic regulations before transporting the machine Storage Ø Allow the engine to cool before storing the machine Never s...

Page 11: ... 3 M from the location where it was filled Ø Turn off the fuel supply for storage or transport Ø If leaks arise in the fuel system the engine must not be started until the problem has been resolved Ø Check the fuel level before each use and leave space for the fuel to expand because the heat from the engine and the sun can otherwise cause the fuel to expand and overflow Ø Avoid overfilling If you ...

Page 12: ...te your engine warranty Contact your dealer if you have any questions regarding service or guarantee matters Follow all maintenance instructions Ø Do not change the setting of governors and avoid running the engine with overly high RPM If you run the engine too fast you risk damaging the machine components Ø Do not modify safety equipment Check regularly to be sure it works properly The machine mu...

Page 13: ...rd 13 Fuel tank 14 Fuel filler cap Throttle The lever on the engine is normally not used It is connected to the throttle on the handle If the cable should bind or break you can reduce the throttle with the lever on the engine as an emergency measure to slow the engine speed to an idle and stop the cutting wheel Starter The starter is of the magnapull type with spring return To replace the return s...

Page 14: ... the machine is not in use to avoid flooding the carburetor The fuel valve is combined with a sludge reservoir Choke control The choke control opens and closes the choke valve in the carburetor This is only used to start a cold engine The image shows the choke valve open to close move the lever to the left The midway positions can be used When the engine starts the lever can be moved gradually to ...

Page 15: ...lly For this reason always remove the ignition cable shoe from the spark plug To avoid pulling the cable the cable shoe is equipped with a special handle see the illustration Type of spark plug see Technical data Service instructions see Maintenance Electrical system Muffler The engine muffler is equipped with a heat protective cowling Nonetheless it still becomes hot when the engine is running Av...

Page 16: ...ore fueling Keep the fuel and fuel tank clean Avoid filling the machine with dirty fuel Make sure the fuel cap is properly tightened and the gasket is not damaged particularly before washing the machine Use unleaded gasoline with minimum 86 octane rating Never use gasoline mixed with two cycle oil For ethanol and methanol fuel the following applies Maximum allowable ethanol 10 volume Maximum allow...

Page 17: ...ot possible for the user to make adjustments Throttle The lever controls engine speed With the lever down the engine runs at idle and functions as start position When the engine speed increases the centrifugal clutch drive automatically engages the cutting wheel Brake The lever activates a disk brake on the left wheel when it is pulled backwards The brake should always be activated when operating ...

Page 18: ...ction supplement with protective glasses Make sure that you are familiar with safety regulations and shutdown procedures described previously in the operator s manual Make sure that all guards are in place and in good condition Make sure that the blades and cutters are in place and in good condition Make sure that the work area and cutter in particular and free from metallic objects such as wire n...

Page 19: ...r all the way to the right Choke control When starting the engine warm the lever should be in the right position see the illustration When starting the engine cold or partially warm place the lever completely or partly to the left Move the lever back to the right once the engine starts When the engine is cold it may be best to move the lever back in several stages Find the position where the engin...

Page 20: ... when starting the engine Misuse of the starter handle can damage the starter DO NOT twist the starter cord around your hand Pull out the handle slowly until the gears mesh Then give a sharp pull on the starter handle DO NOT pull out the starter cord completely and DO NOT let go of the starter handle when extended Throttle Keep the throttle at idle When the throttle is increased the cutting wheel ...

Page 21: ...front portion of the stump to ground level 8 Raise cutting blade until center of cutting blade is just above top of stump 9 With the cutting blade off to one side advance the machine horizontally by releasing and resetting the brake Advance the machine forward to engage the cutting blade into the stump so that when swept across the stump it will remove 1 2 to 1 of stump with each sweep 10 Sweep th...

Page 22: ...sition 18 Move throttle up to the ENGAGE position 19 Complete cutting stump by repeating step 12 again and again until entire stump is cut to desired depth 20 Stop the machine Normal shutdown Throttle Set the throttle to SLOW DISENGAGE If the engine has been running full out let it run easily for about 30 seconds to one minute at low speed DO NOT let front of unit touch ground until you are sure c...

Page 23: ... Activate the brake by pulling the lever Fuel valve Close the fuel valve Turn the lever all the way to the left see illustration Release the safety presence bar Wait until the blade stops Make sure that the blade is resting against the ground and has stopped completely before doing anything ...

Page 24: ...nufacturer directly 1 First change after 20 hours 2 In dusty conditions maintenance is required at shorter intervals 3 Before each use 4 Performed by authorized service workshop 5 Performed every second year 6 Grease every 4 hours No service operations may be performed on the engine or unit unless The engine is stopped The ignition cable has been removed from the spark plug The machine is securely...

Page 25: ...air channels The air channels may remain in the upper portion or follow along with the housing when removed Clean the components Use water detergent and a washing up brush Dry carefully Refit the components Place the air channels in the cyclone housing Insert cyclone housing into position and make sure it fits in the upper portion DO NOT use force rater coax it into place before fitting the screws...

Page 26: ...ve the foam rubber pre filter and clean using a mild detergent Squeeze it dry with a clean cloth Soak it with new engine oil Wind the filter in an absorbent cloth and squeeze out excess oil 3 Remove the wing nut in the air filter and remove the paper filter Tap the paper filter against a fixed surface to remove dust If the paper filter is still dirty or damaged it MUST be replaced IMPORTANT INFORM...

Page 27: ...re not to misplace the o ring 1 5 Turn the fuel valve to ON and check for leaks If it leaks replace the o ring Idle adjustment Risk for carbon monoxide poisoning Perform the adjustment outdoors 1 Start the engine and run it until it reaches normal working temperature 2 Adjust the throttle to idle position or so that the engine runs at the lowest possible speed 3 Turn the idle screw 1 so that the e...

Page 28: ...ged Clean the spark plug with a steel brush if it is to be reused 4 Measure the electrode gap with a gapping tool The gap should be 0 7 0 8 mm 0 028 0 031 Adjust as necessary by bending the side electrode 5 Reinsert the spark plug turning by hand to avoid damaging the threads IMPORTANT INFORMATION Inadequately tightened spark plugs can caus overheating and damage the engine Tightening the spark pl...

Page 29: ...the cutting teeth and replace or sharpen any damaged or worn blade sections NOTICE Read all the following instructions before beginning to change cutting blade sections 1 Clean all dirt from the cutting blade and mounting flanges 2 Remove all bolts holding cutting blade Be careful not to let a section drop when they become loose 3 Check each section for cracks Replace blade section if it is cracke...

Page 30: ...cutting blade to wear too much before sharpening The cutting blade sections must be removed from the machine before sharpening NOTICE Sharpening carbide cutting teeth requires a special process US Praxis Inc OFFERS A COMPLETE LINE OF SHARPENING ACCESSORIES AND SHARPENING SERVICES Toll Free 888 316 8200 MAINTENANCE ...

Page 31: ...er handle before starting the engine again Cleaning and washing Regular cleaning and washing will increase the machine s life span Make it a habit to clean the machine directly after use before the dirt sticks Check before reusing that the fuel tank lid is properly in place to avoid getting water in the tank Use caution when using high pressure spray because warning decals instruction signs and th...

Page 32: ...lade when they are moving NOTICE To extend belt life proper tension must be maintained A loose belt will cause excessive cutting blade slippage and belt failure A belt that is too tight can cause bearing shaft and belt failure To adjust belt tension loosen the 2 bolts behind clutch Also loosen the 4 engine mounting bolts Turn square head adjusting bolt on frame clockwise to tighten belt counter cl...

Page 33: ... electrodes Short circuit Gasoline or oil on the spark plug Faulty engine switch cable or ignition Serious interior engine damage or faulty valves Open the fuel valve Close the choke with cold engine Turn engine switch to ON Fill with fuel Clean tank sludge reservoir and empty carburetor Fill the tank with fresh fuel Clean tank sludge reservoir fuel lines and carburetor Fill the tank with fresh fu...

Page 34: ...eft on Clogged air filter Carburetor problems Wrong spark plug type Buildup on electrodes Short circuit Faulty ignition unit Clean or replace the air filter Clean tank sludge reservoir and empty carburetor Fill the tank with proper fuel Fill the tank with proper fuel Clean tank sludge reservoir and empty carburetor Fill the tank with proper fuel Open choke valve Clean or replace the air filter Con...

Page 35: ...the centrifugal clutch Make sure the throttle cable is working properly 2 Belt tension is insufficient Adjust belt tension 3 Clutch is worn replace shoes and springs and or clutch bearings 1 Check that the throttle is disconnected 2 Check for damage on the throttle cable 3 Check that the throttle cable is properly mounted on the throttle valve 4 The engine speed is not under 1000 rpm which is requ...

Page 36: ... an engine with fuel in the tank indoors or in poorly ventilated spaces where fuel vapor can come in contact with open flame sparks or a pilot light such as in a boiler hot water tank clothing drier etc Handle the fuel with caution It is very flammable and careless use can cause serious damage to person and property Drain the fuel into an approved container outdoors and far away from open flame NE...

Page 37: ...on 9 Cover the blade and cutters with a thin coat of oil to avoid rust SPECIFICATIONS Model Engine Power Idling speed Spark plug Fuel tank volume Tires Brake Drive Belt Clutch Cutters Cutting depth Length Width Height Weight PRX90 Honda GX270QXC9 9 hp 1250 1550 RPM NK BPR6ES DENSO W20EPR U 6 liters 1 60 US Gal 4 10 4 pneumatic Disk Lever activated Direct 3V Centrifugal clutch 12 cutters with tungs...

Page 38: ...d start the engine 11 Check that the machine and working equipment do not move in neutral 12 Check that all operating instruments 13 Check decals and information attached to the unit 14 Check the engine speed RPM see Technical Data 15 Check for leakage 16 Inform the customer about The need and advantages of following the service schedule The need and advantages of leaving the machine for service E...

Page 39: ...US Praxis Inc Copyright 2009 All rights reserved 39 PARTS LIST PRX90 PRX130 Chassis and Engine Assembly ...

Page 40: ...US Praxis Inc Copyright 2009 All rights reserved 40 CHASSE AND ENGINE ASSEMBLY ...

Page 41: ...6 Flat Washer 8 12 95105 3 8 16 x 1 Bolt 1 13 33893 3 8 Lock Washer 1 14 96005 5 16 Flat Washer 1 15 95813 3 8 16 Nut 1 16 37820 A Spacer 1 17 37820 B Spacer 1 18 95053 5 16 18 x 3 4 Bolt 1 19 33620 5 16 Lock Washer 1 20 95812 5 16 18 Nut 1 21 26076 Square 3 8 16 x 3 Bolt 1 22 95813 3 8 16 Nut 2 23 3002500250 1750 1 4 Key 1 24 VRVC201 3V Sheave with Bushing 1 24 VC 304 Front Shaft Pulley Prior to ...

Page 42: ...US Praxis Inc Copyright 2009 All rights reserved 42 HANDLE ASSEMBLY MODELS PRX90 PRX130 ...

Page 43: ...014 Nylock 10 24 2 9 VC 352 Electrical Wiring 1 10 VC 306 Throttle Cable with Knob 1 11 VC 306 Throttle Cable with Knob 1 12 28794 6 32 x 3 8 Screw 2 13 37010 Nylock 6 32 2 14 VC 307 Brake Lever 1 15 95063 5 16 18 x 2 1 2 Bolt 2 16 33620 5 16 Lock Washer 2 17 95812 5 16 18 Nut 2 18 VC 308 Brake Cable 1 19 95159 7 16 14 x 1 1 2 Bolt 4 20 96006 3 8 Flat Washer 8 21 33894 7 16 Lock Washer 4 22 95814 ...

Page 44: ...US Praxis Inc Copyright 2009 All rights reserved 44 BLADE AND SHAFT ASSEMBLY MODELS PRX90 PRX130 ...

Page 45: ... 24 Nut 4 7 FC 302 A Shaft with Key 1 8 FC 302 B Shaft Flange 1 9 15109 3 8 16 x 1 1 2 Bolt 8 10 33893 3 8 Lock Washer 8 11 95813 3 8 16 Nut 8 12 VC 300 Complete Set of Fasteners Blade 8 Bolts Locks Nuts 1 13 PRX 1000 Stump Grinding Quadrublade 1 PRX 2000 Trencher Grinding Quadrublade 1 PRX 250 1 4 section Stump Grinding Quadrublade 1 PRX 500 1 4 section Trencher Grinding Quadrublade 1 PRX4000 Six...

Page 46: ...US Praxis Inc Copyright 2009 All rights reserved 46 ...

Page 47: ...b 9hp 2 1 VC 325 13 Tire without Hub 13hp 2 2 VC 325H 9 Tire Complete with Hub 9hp 1 2 VC 325H 13 Tire Complete with Hub 13hp 1 3 VC 325B 9 Tire Complete with Brake Hub 9hp 1 3 VC 325B 13 Tire Complete with Brake Hub 13hp 1 4 VC 396 Wheel Bearing 4 5 VC 383 Set Collar 2 6 VC 395 Hub 1 7 VC 397 Hub with Brake Disk 1 PRX90 PRX130 Chassis and Flap Assembly ...

Page 48: ...US Praxis Inc Copyright 2009 All rights reserved 48 ...

Page 49: ...5 16 18 Nut 6 6 FC 319 A Right Side Flap 1 7 FC 319 B Right Side Flap Support 1 8 95055 5 16 18 x 1 Bolt 5 9 33620 5 16 Lock Washer 5 10 95812 5 16 18 Nut 5 11 FC 320 A Left Side Flap 1 12 FC 320 B Left Side Flap Support 1 13 95053 5 16 18 x 3 4 Bolt 4 14 33620 5 16 Lock Washer 4 15 95812 5 16 18 Nut 4 16 FC 321A 9 Small Flap 9hp 1 16 FC 321A 13 Small Flap 13hp 1 17 FC 321B 9 Small Flap Support 9h...

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