5. Force lubricant into the upper and lower kingpin
grease fitting caps until new lubricant flows from
between the upper axle beam end and the
knuckle, and between the lower axle beam end
and the knuckle. See
Fig. 4.
6. Remove the chocks from the tires.
33–02 Tie Rod End Lubricating
Detroit Axles
For any Detroit axle that requires lubrication of the
tie-rod ends, wipe the grease fittings clean, then
pump multipurpose chassis grease, NLGI Grade 1
(6% 12-hydroxy lithium stearate grease) or NLGI
Grade 2 (8% 12-hydroxy lithium stearate grease),
into the tie-rod ends until all used grease is forced
out and fresh grease is seen at the ball stud neck.
See
Fig. 5.
Meritor Axles
This procedure applies to all tie rod ends on Meritor
nondrive steering axles.
1. Park the vehicle with the wheels in the straight-
ahead position. Turn off the engine, apply the
brakes, and chock the rear tires.
2. Wipe clean the zerk fitting and the seal or boot.
NOTE: Synthetic lubricants are not approved for
tie rod end lubrication.
3. Using a grease gun, apply a multipurpose
grease, NLGI grade 1 or 2, to the zerk fitting until
all the old grease is purged from the boot.
Discolored old grease should come out of the
purge holes near the boot crimp or bellows area.
Apply grease until all the old grease is purged
from the boot.
NOTE: If using an air pressure grease gun, do
not exceed 150 psi (1034 kPa).
4. If the tie rod end is designed for lube service and
it does not accept grease, perform the following
substeps.
4.1 Remove the zerk fitting.
4.2 Inspect the threaded zerk fitting hole in
the tie rod end, and remove any
obstructions.
4.3 Install a new zerk fitting.
4.4 Apply lubrication to the new zerk fitting.
5. Remove the chocks from the tires.
33–03 Draw Key Nut Torque
Checking
Axles With Unitized Wheel Ends
Check the torque of the nut that holds the draw key
on the side of the knuckle. The torque should be
30 to 45 lbf·ft (41 to 61 N·m). See
Fig. 6.
33–04 Tie Rod End Inspecting
IMPORTANT: If the tie rod end boot is torn or
missing, replace the entire tie rod end. Do not
replace the boot only.
1. Shut off the engine, apply the brakes, and chock
the rear tires.
2. Check the tie rod boot for cracks, tears, or other
damage. If the tie rod boot is damaged, replace
the entire tie rod end.
3. The threaded portion of the tie-rod end assembly
must be inserted all the way into the cross-tube
split for adequate clamping. See
Fig. 7. Replace
the components if this cannot be done. For
instructions, refer to Group 33 of the Business
Class® M2 Plus Workshop Manual.
06/12/2012 f330273
1
2
NOTE: No grease should emit from the tie-rod boot. If
grease emits from the tie-rod boot, the boot is
damaged.
1. Grease Fitting 2. Boot
Fig. 5, Grease Fitting and Boot, Detroit Axle
Front Axle 33
Business Class M2 Plus Maintenance Manual, 02/10/2023 33/3
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