Drum Removal; Drum Fitment; Re-Adjust Brakes - Meritor LM Series Maintenance Manual

5 Drum Replacement 5 Drum Replacement

DRUM REMOVAL

The following procedures can be performed either with the road
wheel and brake drum assembled to the hub or with the road
wheel and brake drum removed. In the latter instance follow the
procedure below.
Raise the vehicle enough to get clearance to remove the wheel
and tyre. Support the axle with safety stands. Remove the wheel
and tyre.
WARNING
: Do not work under a vehicle supported
only by jacks. Jacks can slip or fall over and cause
serious personal injury. Support the vehicle with safety
stands, block the wheels to prevent the vehicle from moving.
DE-ADJUST BRAKES
Using the manual adjustment nut on the slack adjuster fully de-
adjust the brake. Follow the appropriate procedure for the type of
automatic slack adjuster fitted. Instructions are available through
the Meritor Inc. Technical Sales Department.
Use two suitable M12 x 1.75 screws to jack the brake drum face
from the hub. The screws should be tightened evenly to prevent
the drum from jamming on the hub spigot (Fig. 5.1).
NOTE
: It is adviseable to grind a lead onto the threaded end of
the M12 scews to prevent any possible binding in the brake drum.
The brake drum can then be lifted clear of the hub.
Fig. 5.1
Meritor Inc. LM & LC Series Axle
37

DRUM FITMENT

Replace the brake drum by fitting over the ten wheel studs. To
assist with future drum removal, ensure the two threaded jack –
off holes in the drum flange are aligned with the two bosses on
the hub flange (Fig. 5.2).
Ensure the drum is fully seated on its location spigots.
Fig. 5.2
WARNING
: The brake drum is not positively
secured to the hub and is loose on the axle until the road
wheel is replaced and wheel nuts secured.
If the trailer is to be moved or left unattended prior to
replacement of the road wheel, ensure the brake drum is
temporarily secured by fitting a minimum of two wheel nuts
diametrically opposite to each other.
Refit the road wheel.
Remove the axle safety stands and lower the vehicle to the
ground.