Lubrication of the Meritor Slack Adjuster

m2+ m 42.07.000

Important: Perform a brake inspection following the instructions in this group before lubricating 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 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  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..

  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. 1, Meritor Automatic Slack Adjuster

Note:
Parent topic: Brakes
Document Number: 0000121030
Manual Publication Date: 2025-02-11
Topic Publication Date: 2024-11-06