move the driveshaft and have it balanced; see
Group 41 of the
Business Class
®
Trucks Service
Manual
.
8. For driveshafts with slip-joints, check that the
yoke plug is not loose or missing. See Fig. 4,
Ref. 2. Replace the yoke plug if needed. If the
yoke plug is missing, the splined shaft may be
hitting the yoke plug and knocking it out; check
the driveshaft for proper length.
41–02 Driveline Lubricating
U-Joint Lubricating
1. Wipe all old grease and dirt from each U-joint
grease fitting. See Fig. 4, Ref. 8.
2. Use a hand-type grease gun, or a high-pressure
gun with a low-pressure adapter, to lubricate the
U-joints.
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-
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
Business Class Trucks Maintenance Manual, January 1998 41/3
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