Troy-Bilt 634FM, 634BM manual Forwardclutch, Bailadjustment, Enginecleaning, Aircleanerservice

WARNING: Beforeinspecting, cleaning or servicing the machine,shut off engine, wait for all moving partsto come to a complete stop, disconnect spark plug wire and move wire awayfrom spark plug. Failureto follow these instructions can result in serious personalinjury or property damage.

FORWARDCLUTCH	5.	Releasethe ReverseClutch Control
BAILADJUSTMENT	knob.and then unthread the inner jam nut
If the ForwardClutch Bail does not func-	(C, Figure 5-6) oneto two turns. Pull the
	threaded cableadjuster (A, Figure 5-6) to
tion properly,first checkthat the forward
	the left until the innerjam nut (C) touches
drive belt is adjusted properly (see Check-
	the bracket.
ing and Adjusting Forward Drive Belt Ten-	6.	Preventtheinnerjam nut(C)fromturn-
sion). If this fails to correct the problem,
	ing and tighten the outer jam nut (D)
contact Troy-Bilt LLC or your authorized
	againstthe bracket. Preventthe outer jam
dealerfor service advice.
	nut (D) from turning and tighten the inner
CHECKING AND ADJUSTING RE-	jam nut (C) againstthe bracket.
VERSE DRIVE BELT TENSION	7. Measurethe gap by repeating Step 3.
	Readjustas neededby repeating Steps 5
(Models 634F/634B only)
	and 6.
It is important to maintain correct tension	8.	Reinstall the belt cover.

on the reversedrive belt. A loose belt will causethe tines andwheelsto slow down -

or stop completely - even though the en- gine is running at full speed. Whenchecking belt tension, alsocheckthe belt for cracks, cuts or frayed edges and replace it as soon as possible.

• Check belt tension after the first two hours of break-in operationand after every 10 operating hours.

To CheckReverseBelt Tension:

1. Stop engine, wait for all parts to stop moving anddisconnect spark plug wire.

2. Removescrew in plastic belt coverand

ReplacementBelt Information

If the drive belt needsto be replaced,see your local authorized dealeror refer to the Parts List for ordering information. Use only a factory-authorized belt as an "over- the-counter" belt may not perform satis- factorily. The procedure requires average mechanicalability andcommonly available tools.

ENGINECLEANING

Keepingthe engineclean will helpto en- sure smooth operation and prevent dam- agefrom overheating. Referto the Engine Owner'sManual for engine cleaning ser- vice intervals and instructions. Besure thatthe muffler is cool beforeservicing the engine.

AIRCLEANERSERVICE

Theair cleaner filters dirt and dust out of the air before it enters the carburetor. Op- erating the enginewith a dirty, clogged air filter can causepoor performance and damageto the engine. Neveroperate the enginewithout the air cleaner installed. In- spect and servicethe air cleaner more of- ten if operating in very dusty or dirty conditions. Referto the engine Owner's Manualfor air cleanerservice intervalsand

slide belt cover (which is attached to for- ward clutch cable) out of the way.

3. Havean assistant pull the Reverse Clutch Control knob all the way out and

Figure5-5: Measurecablewirelengthto checkfor correctreversebelt tension.

instructions.

ENGINEOILSERVICE

Checkthe engineoil level before each use

hold it inthat position. Measurethe length of the cable wire betweenthe end of the

threadedcableadjuster (A, Figure5-5) and

the end of the Z-fitting (B) to which the ca- ble wire is attached.

4. The belt tension is idealifthe cablewire length measuresbetween1/8" to 1/4". If it is lessthan 1/8" (and if there is no reverse actionwhenthe tiller is running),then make the following adjustments

NOTE:Ifthe lengthis morethan 1/4",noad- justment is needed--as long as the reverse actionfunctions properly.

Figure5-6: Movethreadedadjuster(,4)toleft toincreasebelttension.

andafter everyfive hours of continuous operation. Running the engine when it is low on oil will quickly ruin the engine.

It is recommendedthat you change the motor oil after every 10hours of operation and even sooner when operating in ex- tremely dirty or dusty conditions. Referto the EngineOwner'sManual for detailed service instructions.

A. To Checkthe Engine 0il Level:

1.Parkthe tiller on a levelareaand shut off the engine.

2.Levelthe engine (use the Depth Regu- lator Lever to adjust the engineangle).

2O