Troy-Bilt 644H-Bronco, 645A-Bronco manual Position, To Check Forward Belt Tension

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Section 5: Maintenance

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

 

OPERATOR

C

 

POSITION

 

TINE￿

 

 

SHAFT

 

A

 

 

ENGINE

 

 

DENOTES CUTTING EDGE ￿

 

 

OF TINE

 

 

B

C

D

 

Figure 5-3: Tines, tine holders and installation hardware.

5

4

3

A

2

 

 

1

C

B

Figure 5-4: Lift bail and check length of Clutch Bail Spring to check for correct belt tension (1-7/8").

Clutch Bail all the way up to the bottom of the upper handlebars, you will need to loosen the belt tension.

Also check the belt for cracks, cuts or frayed edges and replace it as soon as possible.

Check belt tension after the first two hours of initial operation (new belt).

Check belt tension after every 10 operating hours.

To Check Forward Belt Tension:

1. Be sure that the engine is stopped and

the spark plug wire is disconnected and

moved away from the spark plug.

2. Loosen nut “C” (Figure 5-4) several

turns so it is about halfway up the

threaded adjustment screw.

3. Lift the Forward Clutch Bail up and

hold it to the bottom of the handlebars.

Measure the length of the clutch bail

spring (A, Figure 5-4) with a ruler. If the

belt tension is correct, the length of the

coiled portion of the spring should be

approximately 1-7/8". Nut “C” should

then be snugged down against the top of

the adjuster (B).

4. If the spring is too short, the belt

tension will be too loose. If the spring is

too long, the belt tension will be too tight.

5. To adjust the length of the spring,

release the Forward Clutch Bail. Thread

the hex nut (C, Fig. 5-4) halfway up the

adjustment screw. Turn the screw inside

the spring (A, Figure 5-4) counterclock-

wise (as viewed from the operator’s

position) while holding the adjuster (B)

steady to increase the length of the

spring, or turn clockwise (as viewed from

the operator’s position) to decrease the

CHECKING AND ADJUSTING FORWARD DRIVE BELT TENSION

Maintaining correct tension on the forward drive belt is important to good tilling performance and long belt life. A loose belt will slip on the engine and

transmission pulleys and cause the 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 you find you can not bring the Forward

length of the spring.

NOTE: If you have difficulty holding the adjuster steady by hand, use a pliers or wrench on the adjuster. While you turn the screw, keep the Forward Clutch Cable

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Contents Operator’s Manual Table of Contents Safety Ments or inspectionsKeep children and pets away SafetyUse a deep depth regulator setting Use slower engine speeds Never operate the tiller underOperating Symbols DecalsLoose Parts List Qty. Description AssemblyTools/Materials Needed for Assembly IntroductionAttach Handlebar AssemblyMove Tiller Off Shipping Platform Install Reverse Clutch Cable Install Forward Clutch CableCheck Air Pressure in Tires Check Level Transmission Gear OilCheck Hardware for Tightness Tiller is shipped without oil in the engineForward Clutch Bail Depth Regulator Features and ControlsWheel Drive Pins Reverse Clutch Control Anti-Reverse StakeTo Operate the Forward Clutch Bail Forward Clutch BailReverse Clutch Control To Operate the Reverse Clutch ControlDepth Regulator Lever Features and ControlsHandlebar Height Adjustment Anti-Reverse StakeInitial Operation OperationIntroduction Starting and Stopping the EngineOperating the Tiller Use the Fast throttle speed setting when tillingOperation Starting the EngineFor reverse motion of the wheels and tines Turning the Tiller AroundStopping the Tiller and Engine Avoid tilling soggy, wet soil Let the tiller do the workTilling depths Avoid making footprintsTilling on slopes Tilling across slopes without using terracesClearing the tines Tilling up and down slopesLoading and Unloading the Tiller Every MaintenanceRequired Maintenance Schedule HoursTiller Lubrication MaintenanceTransmission Gear OIL Service Check for OIL LeaksTines Removing and Installing Tine AssembliesRemoving and Installing Individual Tines Tine InspectionPosition To Check Forward Belt TensionReverse Belt Replacement Information Forward Clutch Bail AdjustmentTo Check Reverse Belt Tension Spark Plug Service Engine OIL ServiceAIR Cleaner Service Engine CleaningTroubleshooting TROY-BILT Tiller Lifetime Limited Warranty TROY-BILT LLC, P.O. Box 361131, Cleveland, Ohio 44136-0019