four
bearing-cap seals of each U-joint. On full-
round yokes equipped with a bearing cup, if most
of the grease being added to a U-joint can be
seen escaping from just one of the U-joint seals,
check the torque on the capscrews at that seal.
4.
Tighten the bearing-cup capscrews 43 lbf·ft (58
N·m). If the capscrews were already tight, or all
of the U-joint seals still do not purge, remove the
bearing cup at that seal, and examine the seal
for damage. If the seal is damaged, replace the
complete U-joint.
5.
If grease does not appear at one seal, use a pry-
ing tool to pry the U-joint trunnion away from the
non-purging seal, or tap the driveshaft or yoke
with a plastic or rawhide mallet on the side oppo-
site the dry seal, while continuing to lubricate. If
grease still does not appear, loosen the cap-
screws at the bearing with the dry seal, to relieve
seal tension. Lubricate the U-joint until new
grease is seen at the seal, then tighten the cap-
screws to the correct torque specifications. If the
bearing will not take grease, replace the U-joint.
Refer to
Group 41
of the vehicle Workshop
Manual for replacement instructions.
6.
Check the purged grease. If it appears rusty,
gritty, or burned, replace the U-joint.
7.
Wipe the purged grease from the seals, and any
excess grease from the grease fitting.
Slip Joint Spline Lubrication
NOTE: Vehicles equipped with Meritor RPL Se-
ries drivelines do not require periodic lubrication.
1.
If equipped with a grease fitting, wipe all old
grease and dirt from the slip joint grease fitting.
See
2.
Use a hand-type grease gun or a high-pressure
gun with a low-pressure adapter, to lubricate the
slip joint. Add multipurpose chassis grease
(lithium 12-hydroxy stearate, NLGI Grade 2, with
EP additives) until it appears at the pressure-
relief hole in the yoke plug. Then cover the relief
hole with your finger, while continuing to apply
gun pressure until new grease appears at the
slip joint seal. See
. This ensures complete
lubrication of the splines.
3.
Wipe the purged grease from the pressure-relief
hole and slip joint seal, and any excess grease
from the grease fitting.
f410050a
10/20/93
1
1
2
3
3
3
4
5
6
7
8
A
A. After grease appears, cover the pressure-relief hole
while continuing to lubricate.
1.
Slip Joint Grease Fitting (with grease gun attached)
2.
Yoke Plug
3.
Grease
4.
Half-Round Yoke
5.
Yoke Plug Pressure-Relief Hole
6.
Slip Joint Seal
7.
Full-Round Yoke
8.
U-Joint Grease Fitting
Fig. 6, Slip Joint and U-Joint Lubrication
Driveline
41
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