slack adjusters use a special NLGI Grade
synthetic polyurea grease and do not require
lubrication for 3 years or 500,000 miles (800
000 km), whichever comes first. The extended-
maintenance slack adjusters are lubricated
during the brake reline service interval. For
service and lubrication instructions, see Group
42 of the Business Class M2 Plus Workshop
Manual.
For slack adjusters with grease fittings and for
operating 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
operating temperatures below –40°F (–40°C) and
above –65°F (–54°C), use an NLGI Grade 2
synthetic oil, 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. 8.
42–08 Air Dryer AD–9, AD–IP,
AD–IS/DRM Check
IMPORTANT: Review the warranty policy before
performing any intrusive maintenance
procedures. An extended-warranty may be
voided if intrusive maintenance is performed
during this period.
Because no two vehicles operate under identical
conditions, maintenance and maintenance intervals
will vary. Experience is a valuable guide in
determining the best maintenance interval for any
one particular operation.
Every 900 operating hours, or 25,000 miles (40 225
km), or 3 months:
1. Check for moisture in the air brake system by
opening reservoir drain valves and checking for
the presence of water. If moisture is present, the
desiccant cartridge may require replacement;
however, the following conditions can also cause
water accumulation and should be considered
before replacing the desiccant:
1.1 An outside air source has been used to
charge the system. This air did not pass
through the drying bed.
1.2 Air usage is exceptionally high and not
normal. This may be due to high air
system leakage.
1.3 In areas where more than a 30-degree
range of temperature occurs in one day,
small amounts of water can temporarily
accumulate in the air brake system due to
condensation. Under these conditions, the
presence of small amounts of moisture is
normal.
NOTE: A small amount of oil in the system is
normal and should not be considered as a
reason to replace the desiccant cartridge. Some
oil at the dryer exhaust is normal.
2. Visually check for physical damage such as
chaffed or broken air and electrical lines and
broken or missing parts.
3. Check mounting bolts for tightness. Tighten to 30
to 35 lbf·ft (41 to 47 N·m).
4. Perform the operational and leakage tests listed
below.
f420012a
10/20/93
1
2
3
4
5
6
7
1. Brake Chamber
2. Clevis
3. Actuator Rod
4. Boot
5. Pressure-Relief Capscrew, Gasket, Pawl Spring,
and Pawl
6. Manual Adjusting Nut
7. Grease Fitting (or plug)
Fig. 8, Meritor Automatic Slack Adjuster
Brakes42
Business Class M2 Plus Maintenance Manual, 02/10/202342/8
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