42–06 Slack Adjuster
Lubrication
IMPORTANT: Perform MOP 42-05 before lubri-
cating the slack adjusters.
Automatic slack adjusters that have a grease fitting
must be lubricated periodically to ensure proper
brake operation.
WARNING
Failure to lubricate slack adjusters could lead to
dragging brakes or a brake failure, resulting in
property damage, personal injury, or death.
Meritor
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. Extended-
maintenance slack adjusters are lubricated dur-
ing the brake reline service interval. For service
and lubrication instructions, see Group 42 of
the 108SD and 114SD Workshop Manual.
For slack adjusters with grease fittings and for oper-
ating temperatures above –40°F (–40°C), use an
NLGI Grade 1 clay-base grease or an NLGI Grade 1
or 2 lithium-base grease.
For slack adjusters with grease fittings, and for oper-
ating temperatures below –40°F (–40°C) and above
–65°F (–54°C), use an NLGI Grade 2 synthetic oil or
a clay-base grease.
Lubricate the slack adjuster at the grease fitting until
grease is forced past the pressure-relief capscrew or
past the gear splines around the inboard snap ring.
See
Fig. 9.
Haldex
NOTICE
Do not use moly-disulfide-loaded grease or oil.
Both the life and reliability of the slack adjuster
will be reduced if this type of grease is used.
Lubricate the automatic slack adjuster at the grease
fitting. See
Fig. 10. Use standard chassis lubricant
for Haldex slack adjusters.
Gunite
For operating temperatures of –20°F (–29°C) and
higher, use Texaco Multifak EP-2 or Mobil Grease
No. 77.
For operating temperatures between –20°F (–29°C)
and –40°F (–40°C), use Lubriplate Aero grease.
Lubricate a Gunite automatic slack adjuster at the
grease fitting until grease appears on the camshaft,
or flows from the grease relief. See
Fig. 11.
Gunite automatic slack adjusters are produced with-
out a grease relief. During lubrication with a grease
gun, the lubricant is forced through the drilled worm
wheel onto the camshaft. Lubricate the automatic
slack adjuster at the grease fitting until grease ap-
pears on the camshaft. See
Fig. 12.
f420012a
10/20/93
1
2
3
4
5
6
7
1. Brake Chamber
2. Clevis
3. Actuator Rod
4. Boot
5. Pull-Pawl Seal
6. Manual Adjusting Nut
7. Grease Fitting (or plug)
Fig. 9, Meritor Automatic Slack Adjuster
Brakes 42
108SD and 114SD Maintenance Manual, October 2019 42/13
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