Checking And Adjusting Reverse Drive Belt Tension; Engine Cleaning; Air Cleaner Service; Engine Oil Service - Troy-Bilt TUFFY 630CN Operator's Manual

WARNING: Beforeinspecting, cleaning or servicing the machine,shut off engine, wait for all
moving parts to come to a complete stop, disconnect spark plugwire and move wire away from
spark plug. Failureto follow these instructions can result in serious personal injury or property
damage.
FORWARD CLUTCH
BAIL ADJUSTMENT
If the Forward Clutch Bail does 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
dealer for service advice.
CHECKING ANDADJUSTING RE-
VERSEDRIVEBELTTENSION
(Models634F/634B only)
It is important to maintain correct tension
on the reverse drive belt. A loose belt will
causethe tines and wheels to slow down -
or stop completely - even though the en-
gine is running at full speed.
Whenchecking belt tension, alsocheck the
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 operation and after every
10 operating hours.
To CheckReverseBelt Tension:
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 attached to for-
ward 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 cable wire between the 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 ideal ifthe cablewire
length measuresbetween 1/8" to 1/4". If it
is less than 1/8" (and if there is no reverse
action whenthe tiller is running),then make
the following adjustments
NOTE:If the length is morethan 1/4",no ad-
justment is needed--as long as the reverse
action functions properly.
5. Releasethe ReverseClutch Control
knob.and then unthreadthe inner jam nut
(C, Figure 5-6) one to two turns. Pull the
threaded cableadjuster (A, Figure 5-6) to
the left until the inner jam nut (C) touches
the bracket.
6. Preventthe inner jam nut (C)from turn-
ing and tighten the outer jam nut (D)
against the bracket. Preventthe outer jam
nut (D) from turning and tighten the inner
jam nut (C) against the bracket.
7. Measure the gap by repeating Step 3.
Readjustas needed by repeating Steps 5
and 6.
8. Reinstall the belt cover.
Figure5-5: Measure cablewirelengthto
check for correct r everse belt tension.
Figure 5-6: Movethreaded adjuster ( ,4)toleft
toincreasebelttension.
ReplacementBelt Information
If the drive belt needsto be replaced, see
your local authorized dealer or 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 and commonly available
tools.
ENGINECLEANING
Keeping the engine clean will help to en-
sure smooth operation and prevent dam-
agefrom overheating. Refer to the Engine
Owner's Manual for engine cleaning ser-
vice intervals and instructions. Be sure
that the muffler is cool beforeservicing the
engine.
AIRCLEANER SERVICE
Theair cleaner filters dirt and dust out of
the air before it enters the carburetor. Op-
erating the engine with a dirty, clogged air
filter can cause poor performance and
damageto the engine. Never operate the
engine without the air cleaner installed. In-
spect and servicethe air cleaner more of-
ten if operating in very dusty or dirty
conditions. Refer to the engine Owner's
Manualfor air cleanerservice intervalsand
instructions.
ENGINEOILSERVICE
Checkthe engine oil level before each use
and after every five 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 10 hours of operation
and even sooner when operating in ex-
tremely dirty or dusty conditions. Refer to
the Engine Owner's Manual for detailed
service instructions.
A. To Checkthe EngineOil Level:
1. Parkthe tiller on a levelarea and shut
off the engine.
2. Levelthe engine (use the Depth Regu-
lator Lever to adjust the engine angle).
2O