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Servicing the Crownwheel and Differential Assembly
Section B
Refer to Sections A, D and E and remove the pinion cartridge, axle arm assemblies,
sungears and brake plates.
Withdraw the brake pistons and discard the “O” rings.
Remove the cap headed screws and brake pipe adaptors retaining the brake cylinders
into the centre casing, mark both the cylinders and casing so that the cylinders can be
refitted in their respective ends of the casing on re-assembly.
Stand the maincase on one cylinder end and carefully withdraw the now upper cylinder, if
necessary the cylinders can be “jacked” out of the casing by fitting two setscrews into the
threaded holes provided in each cylinder.
Lift out the differential assembly and turn the centre casing over, withdraw the remaining
brake cylinder. Note which end of the centre casing the crownwheel is located. Locating
the crownwheel into the opposite end of the casing from which it was removed will result
in the axle rotation being reversed.
Important:
Unless the brake cylinders, differential bearings, differential casing halves or
maincase are to be replaced do not disturb the adjusting ring nuts located in the centre of
the brake cylinders otherwise the differential bearing preload and crownwheel/pinion
backlash will need resetting as described in Section F.
Remove the nuts and bolt securing the crownwheel and the two halves of the differential
casing together, lift off the crownwheel and separate the two halves of the casing
exposing the differential spiders, pinion and wheels.
Examine each component for wear and replace as necessary. Re-assemble taking care
that all components are kept clean, align the indent marks on the casing halves and
torque the nuts and bolts to:-
7.8Kpm (56lbft)
Clean the mating surfaces of the brake cylinders and main casing and coat the surfaces
with one of the recommended sealants. Reassemble one cylinder into its respective end
of the casing and stand the casing on that end. Carefully lower the differential assembly
into the centre casing and install the second brake cylinder. Secure with the cap head
screws and the brakepipe adaptors.
Lubricate the pistons, new seals and cylinders with clean hydraulic oil (not brake fluid)
and assemble the pistons into the cylinders.
Refer to Sections A, D and E and re-assemble the axle.