Troy-Bilt 644HMBRONCO, 645AMBRONCO manual Position, Checkingand Adjusting Forwarddrive Belttension

Section5: Maintenance

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

		Clutch Bail all the way upto the bottom of
		the upper handlebars,you will needto
		loosen the belt tension.
OPERATOR	C	Also check the belt for cracks, cuts or
POSITION		frayed edges and replaceit as soon as
		possible.
TINED		• Checkbelt tension after the first two
		A
		hours of initial operation (new belt).
		• Checkbelt tension after every 10
		operating hours.

ENGINE

,'_ DENOTES CUTTING EDGE _3

OF TINE

Figure5-3: Tines,tineholdersandinstallationhardware.

Figure5-4: Liftbail andchecklengthofClutchBailSpringtocheckforcorrectbelttension

(1-7/8").

To CheckForwardBelt Tension:

1. Besure that the engine is stopped and

the spark plug wire is disconnectedand

moved awayfrom the spark plug.

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

turns so it is about halfway upthe

threaded adjustment screw.

3. Lift the Forward Clutch Bail up and

hold it to the bottom of the handlebars.

Measurethe 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 besnugged down againstthe top of

the adjuster (B).

4. If the spring is too short, the belt

tension will betoo loose. If the spring is

too long, the belt tension will betoo tight.

5. To adjust the length of the spring,

releasethe ForwardClutch 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)

steadyto increasethe length of the

spring, or turn clockwise (as viewed from

the operator'sposition) to decreasethe

CHECKINGAND ADJUSTING FORWARDDRIVE BELTTENSION

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 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 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, keepthe Forward Clutch Cable

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