Troy-Bilt 634K Enginecleaning, Aircleanerservice, Checkingandadjustingre- Versedrivebelttension

moving partsto come to a complete stop, disconnectspark plug wire and move wire awayfrom

,_ WARNING: Beforeinspecting, cleaning or servicing the machine,shut off engine, wait for all spark plug. Failureto follow these instructions can result in serious personal injury or property

damage.

FORWARDCLUTCH

BAIL ADJUSTMENT

If the Forward Clutch Baildoes not func- tion properly,first checkthat the forward drive belt is adjusted properly (see Check- ing and Adjusting Forward Drive Belt Ten- sion). If this fails to correct the problem,

contact Troy-Bilt LLC or your authorized dealerfor service advice.

CHECKINGANDADJUSTINGRE- VERSEDRIVEBELTTENSION

(Model 634A only)

It is important to maintain correct tension on the reversedrive belt. A loose belt will causethe tines andwheelsto slow down - or stop completely - eventhough the en- gine is running at full speed.

Whenchecking belttension, also checkthe belt for cracks, cuts or frayed edgesand replace it as soon as possible.

•Checkbelt tension after the first two hours of break-in operation andafter every 10 operating hours.

To CheckReverse BeltTension:

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

2.Removescrew in plastic belt cover and slide belt cover (which is attachedto for- ward clutch cable) out of the way.

3.Haveanassistant pull the Reverse Clutch Control knob all the way out and hold it inthat position. Measurethe length of the cable wire betweenthe end of the

threaded cableadjuster (A, Figure5-5) and

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

4. Thebelt tension is idealif the cablewire length measuresbetween1/8"to 1/4".If it is lessthan 1/8" (andif there is no reverseac- tion whenthe tiller is running), then make the following adjustments

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

5. Releasethe ReverseClutch Control knob.andthen unthread the inner jam nut (C, Figure 5-6) oneto two turns. Pull the threaded cable adjuster (A, Figure 5-6) to

the left until the innerjam nut (C) touches the bracket.

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

7.Measurethe gap by repeating Step 3.

Readjust as neededby repeating Steps 5 and 6.

8. Reinstall the belt cover.

Figure5-5: Measure cable wire length to checkfor correct reversebelt tension.

Figure5-6: Movethreadedadjuster(,4)toleft toincreasebelt tension.

Replacement Belt Information

If the drive belt needsto be replaced,see your local authorizeddealeror 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 help to en- sure smooth operation and prevent dam- agefrom overheating. Referto the Engine Owner'sManualfor enginecleaning ser- vice intervals and instructions. Besure thatthe muffler is cool beforeservicing the engine.

AIRCLEANERSERVICE

The air 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. Neveroperatethe enginewithout the air cleanerinstalled. In- spect and service the air cleaner more of- ten if operating in very dusty or dirty conditions. Referto the engine Owner's Manualfor air cleanerservice intervals and instructions.

ENGINE OIL SERVICE

Checkthe engine oil level before each use and after every five hours of continuous operation. Runningthe engine when it is low on oil will quickly ruin the engine.

It is recommendedthat you changethe 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 Oil Level:

1.Parkthetiller ona levelareaandshut off the engine.

2.Levelthe engine (use the Depth Regula- tor Leverto adjust the engineangle).

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