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NOTE: If a low-pressure adapter is not used
with the high-pressure gun, the U-joints may not
receive enough lubricant.
3. Using lithium 12-hydroxy stearate grease (NLGI
grade 1 or 2, with EP additives), lubricate until
new grease can be seen at all four U-joint seals.
IMPORTANT: Fresh lubricant must be seen es-
caping from
all four
bearing cup seals of each
U-joint.
On full-round yokes, if most of the grease being
added to a U-joint can be seen escaping from
just one of the U-joint seals, bend the tabs of
the lockstrap away from the heads of the bear-
ing cup capscrews, then check the torque on
the bearing cup capscrews at that seal. Tighten
the bearing cup capscrews as follows:
• 5/16–24 capscrews: 24 lbf·ft (32 N·m)
• 3/8–24 capscrews: 37 lbf·ft (50 N·m)
Bend the lockstrap tabs up, against a flat side of
each capscrew. 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 exam-
ine the seal for damage. If the seal is damaged,
replace the complete U-joint assembly.
If grease does not appear at one of the seals,
use a screwdriver to pry the U-joint trunnion
away from the non-purging seal, or tap the
driveshaft or yoke with a plastic or rawhide mal-
let (on the side opposite the dry seal), while
continuing to apply gun pressure. If grease still
does not appear, bend the tabs of the lockstrap
away from the heads of the bearing cup cap-
f410012a
05/27/93
Attempt to bend the sleeve yoke and splined shaft back
and forth.
Fig. 2, Slip-Joint Spline Wear Checking
f410110b
06/13/96
A
A
B
C
C
D
A. Measurement: 3" (76 mm)
B. Measurement: 0.015" (0.38 mm)
C. Measurement: 0.020" (0.51 mm)
D. Measurement: 0.025" (0.635 mm)
Fig. 3, Driveshaft Runout Specifications
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. 4, Slip-Joint and U-Joint Lubricating
Driveline 41
Acterra Maintenance Manual, March 2000 41/3