Troy-Bilt 645AMBRONCO manual Forwardclutch Bailadjustment, ForwardBelt Replacement Information

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Section5: Maintenance

WARNING Before inspecting, cleaning or servicing the unit, shut off engine, wait for all parts to cometo a complete stop, disconnectspark plug wire and move wire away from spark plug. Failure to follow these instructions can result in serious personal injury or propertydamage.

from turning by gripping the upper end of the threaded adjuster (B) with pliers.

6.RepeatStep 3 to measurethe length of the clutch bail spring. Oncethe length is correct, retighten the hex nut against the top of the adjuster.

ForwardBelt Replacement Information

If the drive belt needsto be replaced,see your local authorizeddealer or phonethe factory as instructed on Page2. Referto the Parts List in the back of this manual for correct components Use only OEM (Original Equipment Manufacturer) fre- placement belts. A substitute belt may not perform satisfactorily. The procedure requires average mechanicalability and commonly availabletools.

FORWARDCLUTCH

BAILADJUSTMENT

If the ForwardClutch Bail does not function properly, first check that the forward drive belt is adjusted properly (see "Checking and Adjusting Forward Drive Belt Tension"). If this fails to correct the problem, contact the factory technical service department or your authorized dealerfor service advice.

CHECKINGAND ADJUSTING REVERSEDRIVE BELTTENSION

Maintaining correct tension on the reversedrive belt is important to good performance and long belt life. A loose belt will slip on the engine andtransmis- sion pulleys and causethe tines and wheels to slow down - or stop com- pletely - even though the engine is running at full speed. A loose belt can also result in premature belt wear.

If there is no reverseaction when the

ReverseClutch Control knob is pulled out, then the belt tension is too loose.

When checking belt tension, also check the belt for cracks, cuts or frayed edges and replace it as soon as possible.

*Checkbelt tension after the first two hours of break-in operation (new belt).

-Checkbelt tension after every 10 operating hours.

To CheckReverse Belt Tension:

1.Be sure that the engine is stopped and the spark plug wire is disconnectedand moved awayfrom the spark plug.

2.Removethe screw in the plastic belt cover and slide the cover (which is attachedto the forward clutch cable) out of the way.

3.Havean assistant pull the Reverse Clutch Control knob all the way out and hold it in that position. Measurethe length of the cable wire betweenthe end of the threaded cable adjuster (A, Figure 5-5) andthe end of the Z-fitting (B) to which the cable wire is attached.

4.The belt tension is ideal if the cable wire length measures between1/8" to 1/4". If the length is lessthan 1/8" (and if there is no reverseaction when the tiller is running), then makethe following adjustments. NOTE:If the length is more than 1/4", no adjustment is needed,as long as the reverseaction functions properly.

5.Releasethe ReverseClutch Control knob. Unthreadthe inner jam nut (C, Figure5-6) oneto two turns and pull the threaded cable adjuster (A, Figure5-6) to the left until the inner jam nut rests againstthe bracket.

6.Preventthe inner jam nut (C) from turning and tighten the outer jam nut (D) againstthe bracket. Preventthe outer jam nut (D) from turning and tighten the inner jam nut (C) against the bracket.

7.Measurethe gap by repeating Step 3. Readjust as neededby repeating Steps5 and 6.

8.Reinstall the belt cover.

Figure 5-5: Measure cable wire length to checkfor correctreverse belt tension.

Figure 5-6: Move threaded adjuster (,4) to left to increase belt tension.

Reverse Belt Replacement Information

If the drive belt needsto be replaced,see your local authorizeddealer or phonethe factory as instructed on Page2. Referto the Parts List in the back of this manual for correct components Use only OEM (Original Equipment Manufacturer) fre- placement belts. A substitute belt may not perform satisfactorily. The procedure requires average mechanicalability and commonly availabletools.

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Contents TRtllcBILT Tableofcontents Safety Safety ÷i I÷1 R Inspectunit Tools/MaterialsNeededfor AssemblyLooseParts List Qty. Description IntroductionMove Tiller Off Shipping Platform Attach HandlebarInstall Forward Clutch Cable Install ReverseClutch CableCheck Hardware for Tightness CheckLevelof TransmissionGearOilCheckAir Pressurein Tires Add Motor Oil to EngineFreewheel Wheel Drive PinsTo Placethe Wheels in WHEELDRIVEor To Operatethe Reverse ClutchControl Forward Clutch BailTo Operatethe Forward ClutchBail Travel Position Shallow Deep Settings To Adjustthe HandlebarsGasoline is Highly Flammable and ITS Vaporsare Explosive IntroductionInitial Operation Startingand Stoppingthe EngineStarting the Engine Operatingthe TillerStoppingthe Tiller and Engine Turning the Tiller AroundTilling depths Let the tiller dothe workAvoidtilling soggy,wet soil AvoidmakingfootprintsTilling up and downslopes Tilling acrossslopeswithout usingterracesTilling on slopes Clearing the tinesLoadingand Unloadingthe Tiller Hours Required Maintenance ScheduleProcedure Before Every Each UseTo Checkthe Transmission Gear Oil Level CHECKTIREPRESSUREonCheckhardware Machines equipped with pneumatic tiresTine Inspection Removingand Installing Tine AssembliesRemovingand Installing IndividualTines TinesTo CheckForwardBelt Tension Checkingand Adjusting Forwarddrive BelttensionPosition Reverse Belt Replacement Information Forwardclutch BailadjustmentCheckingand Adjusting Reversedrive Belttension ForwardBelt Replacement InformationEnginecleaning Engineoil ServiceAIR Cleanerservice SparkplugserviceProblem Possible Cause Correction TroubleshootingPartsList Description PartnoMODELS644H & 645A 1918749 Bumper 710-0395 Partno Description Front Description Partno Wheelshaft MODELS644H & 645AMODELS644H & 645A Partno TROY-BILT LLC, P.O. Box 361131, Cleveland, Ohio 44136-0019 TROY-BILT Tiller Lifetime Limited Warranty