Troy-Bilt 644H Checkhardware, Tillerlubrication, Checkforoil Leaks, Transmissiongearoil Service

Section5: Maintenance

WARNINGBefore inspecting,cleaning or servicing the unit, shut off engine, wait for all i_

parts to come to a complete stop, disconnectspark plug wire and movewire away from spark ..,Lol plug. Failure to follow these instructions can result in serious personal injury or MI propertydamage.

TILLERLUBRICATION

Proper lubrication of the tiller is an essential part of maintenance. After every 10 operating hours, oil or grease the lubrication points shown in Figures 5-1 and 5-1A and described below.

Usea good quality lubricating oil (#30 weight engineoil is suitable) and a quality general purpose grease (with a metal lubricant, if available).

•Removewheels, clean wheel shaft (A, Fig. 5-1) and apply thin coating of grease to the shaft.

•Greaseback, front and sides of depth regulator lever (B, Fig. 5-1).

•Removetines, clean tine shafts (C, Fig. 5-1). Inspectfor rust, rough spots or burrs (look around holes). Fileor sand smooth, coat ends of shaft with grease.

•Oil the threads on the handlebarheight adjustment screws and the handlebar attaching screws (D, Fig. 5-1).

•ShiftingMechanism. Lightlyoil pivot pointsfor smooth operation(E,Fig.5-1A).

D

CHECKFOROIL LEAKS

Before each use, checkyour tiller for signs of an oil leak- usually a dirty, oily accumulation either on the unit or on the floor where it has beenparked.

A little seepagearound a cover or oil seal is usually not a causefor alarm. However, if the oil drips overnight then immediate attention is neededas ignoring a leakcan result in severetransmission damage.

If a cover is leaking,try tightening any loose screws. If the screws aretight, a

new gasket or oil seal may be required. If the leak is from around a shaft and oil

seal,the oil seal probably needsto be replaced. Seeyour authorizeddealer or contact the factory for service or advice.

IMPORTANT:Never operatethe tiller if the transmission is low on oil. Checkthe oil level after every 30 hours of operation and wheneverthere is any oil leakage.

CHECKHARDWARE

Checkfor loose or missing hardware after every 10 operating hours. Tighten or replace hardware before using the tiller. Besure to check the screws underneath the tiller hood (lift the hood flap) that securethe transmission cover andthe depth regulator lever to the transmission.

TRANSMISSIONGEAROIL SERVICE

Checkthe transmission gear oil level after every30 hours of operation or whenever you notice any oil leak. Operatingthe tiller when the transmission is low on oil can result in severedamage.

A. To Checkthe Transmission

Gear Oil Level:

1. Checkthe gear oil levelwhen the trans-

mission is cool. Gearoil will expand in

warm operating temperatures and this

expansionwill provide an incorrect oil

level reading.

2. With the tiller on level ground, adjust

the Depth RegulatorLever up or down to

the notch that makes the tiller level..

3. Removethe oil fill plug (A, Fig. 5-2)

from the transmission housing and look

into the oil fill hole. You will see the main

drive shaft on one side of the hole.

4. The gear oil level is correct if the gear

oil is approximately half way up the side

of the drive shaft.

5. If the gear oil level is low, add gear oil

as described next. If the gear oil level is

okay, securely replacethe oil fill plug.

IMPORTANT:Do not operate the tiller if

the gear oil level is low. Doing so will

result in severedamageto the transmis-

sion components.

6. If adding only a few ounces of gear

oil, use API rated GL-4or GL-5transmis-

	CHECKTIRE PRESSURE(on
	machines equipped with
	pneumatictires)
A	C
Figure5-1	Checkthe air pressure in both tires.
	Deflateor inflate both tires evenlyfrom
	15-to-20 PSi (pounds per square inch).
	Besure that both tires havethe sameair
	pressure or the unit will tend to pull to
	one side.
	NOTE:Your tiller may not beequipped
	with pneumatic tires, eliminating the need
Figure 5-1A	for air pressure checks.

sion gear oil having a viscosity of SAE

140, SAE85W-140 or SAE80W-90. If

refilling an empty transmission, use only

GL-4transmission gear oil having a

viscosity of SAE85W-140 or SAE140.

NOTE:Do not use automatic transmission fluid or engine oil in the transmission.

7. While checking frequently to avoid overfilling, slowly add gear oil into the oil fill hole until it reachesthe halfway point on the drive shaft.

8.Securely replacethe oil fill plug.

2O