TRUCK SERVICE MANUAL
DON'T NEGLECT DRIVE SHAFT LUBRICATION
Lack of adequate or proper lubrication is among the
most common causes of U-Joint and drive shaft failure!
Proper servicing of the drive shaft is an essential part of
vehicle maintenance and should not be overlooked in routine
IN THE VEHICLE OR APPLICATION
To insure proper lubrication of all four bearing
assemblies on universal joints, it is essential that mechanics
add lubricant until it appears at all journal cross bearing seals
(Fig. 10). This assures removal of dirt particles and other
contaminants that may find their way into the bearings and
indicates to the mechanic that the bearings are fully
lubricated. Do not assume that bearing cavities have been
filled with new lubricant unless flow is noticed around all four
bearing seals! Journal cross seals are designed to relieve.
However, if all the seals do not "pop" when being lubed, move
the driveshaft laterally in all four directions and pull or push on
the drive shaft in the direction opposite to the journal cross
seal not relieving while lube gun pressure is being applied to
the alemite fitting. An increase in line pressure may also be
DRIVE SHAFT ASSEMBLY
Factory assembled drive shafts are lubricated at the
plant prior to shipment. However, shipping, handling and
installation of the drive shaft assembly into the vehicle usually
results in some loss of lube. Therefore, it is recommended
that all universal joints be relubricated after installation of the
drive shaft prior to putting vehicle in service.
JOURNAL AND BEARING KITS
Replacement universal joint kits contain only enough
grease to provide needle bearing protection during storage. It
replacement kit prior to assembly, into the drive shaft yokes.
Each journal cross lube reservoir should be fully packed with
a recommended grease and each bearing assembly should
also be wiped with the same grease; filling all the cavities
between the rollers and applying a liberal grease coating on
the bottom of each race. After the kits are installed into the
driveshaft yokes and prior to placing into service, they should
be relubed, through the zerks, using the same grease.
For center bearings, slip joints and universal joints
use IH 251 HEP grease or equivalent NLGI #2 multi-purpose
Relubrication cycles for driveshaft universal joints
and slip splines will vary with service requirements and
operating conditions. Refer to Operator's Manual.
SLIP JOINT LUBRICATION
Relube spline at intervals prescribed in Operator's
Manual. Apply grease gun pressure to lubrication zerk until
lubricant appears at pressure relief hole in welch plug at
sleeve yoke end of spline (Fig. 11). At this point, cover
pressure relief hole with finger and continue to apply pressure
until grease appears at sleeve yoke seal (Fig. 12). This will
insure complete lubrication of spline.
CTS-2730 Page 10
PRINTED IN UNITED STATES OF AMERICA