Forwardclutch Bail Adjustment | Troy-Bilt 644H specs

Section5: Maintenance

WARNINGBefore inspecting, cleaning or servicingthe 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.

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

6.RepeatStep 3 to measurethe length of the clutch bailspring. 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 Useonly OEM (Original Equipment Manufacturer) fre- placement belts. A substitute belt may not perform satisfactorily. The procedure requires average mechanicalability and commonly availabletools.

FORWARDCLUTCH

BAIL ADJUSTMENT

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 authorizeddealer for 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 wheelsto 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.Besure that the engineis 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 cablewire betweenthe end of the threaded cableadjuster (A, Figure

5-5) and the 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, Figure 5-6) one to two turns and pull the threaded cable adjuster (A, Figure 5-6) 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 Steps 5 and 6.

8.Reinstall the belt cover.

Figure55: Measurecablewirelengthto checkforcorrectreversebelt tension.

Figure5-6: Movethreaded adjuster(A)toleftto increasebelttension.

Reverse Belt Replacement Information

If the drive belt needsto be replaced,see your local authorized dealeror phonethe