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-
screws, then loosen the bearing cup capscrews
(at the bearing with the dry seal) to relieve seal
tension. Lubricate the U-joint until the old
grease is purged, then tighten the capscrews to
the above specifications, and bend the tabs of
the lockstrap against a flat side of each cap-
screw. If the bearing will not take grease, re-
place the U-joint assembly; see Group 41 of the
Business Class
®
Trucks Service Manual
.
4. Check the old grease. If it appears rusty, gritty, or
burned, replace the U-joint assembly. See Group
41 of the
Business Class
®
Trucks Service
Manual
.
5. Wipe any excess grease from the seals and
grease fittings.
Slip-Joint Spline Lubricating
1. Wipe all old grease and dirt from the slip-joint
grease fitting. See Fig. 4, Ref. 1.
2. Use a hand-type grease gun or a high-pressure
gun with a low-pressure adapter, to lubricate the
slip-joint. Using lithium 12 hydroxy stearate
grease (NLGI grade 1 or 2, with EP additives),
lubricate until fresh grease appears at the
pressure-relief hole in the yoke plug. Then cover
the relief hole with your finger, while continuing
to lubricate until fresh grease appears at the slip-
joint seal (Fig. 4, Ref. 6). This ensures complete
lubrication of the splines.
3. Wipe any excess grease from the pressure-relief
hole, slip-joint seal, and grease fitting.
Driveline41
Business Class Trucks Maintenance Manual, January 199841/4
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