Meritor TM Series Service Manual page 31

5 Drum Replacement
NOTE:
Detail of the Meritor CVA service tools refered to in this
section can be found in Section 12 Service Tools.
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.
BRAKE DRUM REMOVAL
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 Technical Sales Department.
Remove the Hub/Drum assembly and axle end fixings as described
in Section 4 Hub Service & Replacement.
With the hub and drum assembly removed from the axle, place
the back face of the drum onto a firm flat surface (so that the
studs are pointing vertically upwards). Using the wheel bolt
removal tool (Meritor CVA part number MST 3211), drive out the
wheel bolts (Fig. 5.1).
The brake drum can now be liffted clear of the hub.
Fig. 5.1
Meritor HVS TM Series Axle
31
REPLACEMENT OF BRAKE DRUM
Invert the hub and locate the drum onto the hub spigot and rotate
to align the bolt holes.
CAUTION
: Ensure all mating surfaces are clean,
dry and free from burrs prior to assembly.
If reusing the original hub, care should be taken to align the
serrations on the bolt with the channels previous cut in the hub.
Using the wheelbolt driving tool (Meritor CVA part number MST
3210) drive each bolt until the head is fully seated against the
drum flange (Fig. 5.2). Fit the wheel bolts in a diagonal sequence.
CAUTION
: Ensure that there is NO gap between the
hub flange and wheel bolt head after assembly.
Fig. 5.2
Refit the Hub/Drum assembly and axle end fixings as described in
Section 4 Hub Service & Replacement.
Refit the road wheel and adjust the brakes.
Remove the axle safety stands and lower the vehicle to the
ground.