25–01 Clutch Release Bearing
and Release Cross-Shaft
Lubricating
Clutch Release Bearing
CAUTION
Do not over-lubricate the release bearing. Over-
lubricating could contaminate the clutch internally,
causing clutch slippage and eventual clutch
failure.
On clutches with a grease-type release bearing
(
Fig. 1
), wipe the dirt from the grease fitting. Using a
pressure gun and high-temperature grease only, lu-
bricate the release bearing at the grease fitting until
the grease starts coming out of the fitting. Use only a
lithium-based grease that meets NLGI grade 1 or 2
specifications.
NOTE: On clutches with a sealed release bear-
ing, the release bearing is lubricated at the time
of manufacture and requires no additional
grease for the life of the bearing. This type of
release bearing is not equipped with a grease
fitting.
On Sachs hydraulic clutches, never lubricate the
release bearing. The release bearing is made of
plastic with a kind of embedded grease.
Clutch Release Cross-Shaft
The clutch release cross-shaft is equipped with two
grease fittings; one at each side of the transmission
clutch housing. Wipe the dirt from the grease fittings.
Using a pressure gun, lubricate the cross-shaft with
multipurpose chassis grease.
25–02 Clutch (Pull-Type)
Inspecting and
Adjusting
See Group 25 of the
Business Class
®
Trucks Ser-
vice Manual
for clutch (pull-type) inspecting and ad-
justing.
25–03 Hydraulic Fluid Level
Checking
WARNING
Use only approved DOT 3 brake fluid in the clutch
hydraulic system. Do not mix different types of
brake fluid. The wrong fluid will damage the rub-
ber parts of the system, causing loss of clutch
function and the risk of serious personal injury.
CAUTION
Do not allow the fluid level in the reservoir to go
below the MIN mark. If too much air enters, it will
not be possible to bleed the system properly, and
the clutch could be damaged.
If the fluid level is below the MIN mark, fill the reser-
voir with DOT 3 brake fluid until the level reaches the
MAX mark. See
Fig. 2
.
f250081a
05/27/93
Fig. 1, Release Bearing Grease Fitting
Clutch
25
Business Class Trucks Maintenance Manual, June 2002
25/1