Western Star 47X 2020, Maintenance Manual

Page: 128 / 166

000 km), whichever comes first. The extended-
maintenance camshaft bushings are lubricated
during the brake reline service interval. For ser-
vice and lubrication instructions, see
Group 42
of the 47X and 49X Workshop Manual .
For camshaft brackets with grease fittings, use an
NLGI Grade 1 or Grade 2 multipurpose chassis
grease. Lubricate the camshaft bushings through the
grease fitting on the camshaft bracket or the spider
until new grease flows from the inboard seal. See
Fig. 6 . Follow the steps below for proper greasing.
WARNING
If grease leaks out under the camhead, the cam-
shaft bracket grease seal is worn or damaged. See
Group 42 in the
47X and 49X Workshop Manual
for grease seal replacement instructions. If this
seal is not replaced, the brake linings could be-
come contaminated with grease. The stopping dis-
tance of the vehicle will be increased, which could
result in personal injury or property damage.
Steer Axle S-cam Tube Greasing
1. Park the vehicle on a level surface, shut down
the engine, and set the park brake.
2. Chock the drive-axle tires.
3. Chock steer-axle tires.
4. Grease the S-cam tubes.
Drive Axle S-cam Tube Greasing
1. Park the vehicle on a level surface, shut down
the engine, and set the park brake.
2. Chock the front tires.
3. Chock one drive tire.
4. Cage the drive tire park-brake chamber opposite
of the tire that is chocked.
5. Grease the S-cam tube on the caged park-brake
chamber side only.
6. Uncage the park-brake chamber.
7. Move the drive tire chock to the other side of the
axle and chock the other set of tires.
8. Cage the drive-tire park-brake chamber opposite
of the tire that is chocked.
9. Grease the S-cam tube on the caged brake side
only.
10. Uncage the park-brake chamber.
11. If equipped with more than one drive-axle, repeat
this process for the remaining drive-axle.
42–08 Meritor Slack Adjuster
Lubrication
IMPORTANT: Perform a brake inspection follow-
ing the instructions in this group before lubricat-
ing the slack adjusters.
WARNING
Failure to lubricate slack adjusters could lead to
dragging brakes or a brake failure, resulting in
property damage, personal injury, or death.
NOTE: If equipped with an extended-
maintenance Q Plus
™
brake system, the slack
adjuster will not have a grease fitting. These
slack adjusters use a special NLGI Grade syn-
thetic polyurea grease and do not require lubri-
cation for 3 years or 500,000 miles (800 000
km), whichever comes first. The extended-
maintenance slack adjusters are lubricated dur-
ing the brake reline service interval. For service
f420011a 10/07/2016
1
2
3
A
A. Grease Exit
1.
Brake Chamber
2. Slack Adjuster
3. Non-Pressure-Relief
Grease Fitting
Fig. 6, Camshaft Bracket Lubrication
Brakes
42
47X and 49X Maintenance Manual, August 2020
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