Brakes (with controlled back off)
Axles are fitted with brake controlled back off to maintain a
constant clearance of 0.6mm (0.02in) within the brake pack.
It is important that only one side at a time is dismantled to
prevent damage to the bearings and preserve the
crownwheel and pinion backlash setting.
!
WARNING
A raised and badly supported machine can fall on you.
Position the machine on a firm, level surface before
raising one end. Ensure the other end is securely
chocked. Do not rely solely on the machine hydraulics or
jacks to support the machine when working under it.
Disconnect the battery, to prevent the engine being
started while you are beneath the machine.
GEN 1-1
Dismantling
1 It is recommended that the axle be removed from the
machine when dismantling the rear axle brakes.
2 Remove bolts 1. Use a heavy duty socket to unscrew
them.
3 Jack the axle arm off the drive head, using the drive
head securing bolts. Remove all traces of gasketing
from the mating faces.
4 There are two counterplates 2, one at each end of the
brake pack, which are not secured to the plate carrier 3.
If the plates are to be re-used, note their positions and
which way round they are then withdraw the brake
pack.
5 Remove the circlip 4. If the brake pack is to be re-used,
note the positions of the plates before removing them.
6 Wear limit of friction plates is to the depth of the cross
hatching A. Check all plates for flatness and damage.
(Some scoring of the counterplates is normal.) Renew
the brake pack complete if worn or damaged. Do not
renew individual plates.
7 Remove the three reaction pins 5. Inspect for damage.
Note: If new brake and friction plates are being fitted new
brake back off pins and tension bushes must also be fitted.
Failure to do so could result in the brake being permanently
on.
8 Before removing the brake housing and piston
assembly support the differential with a drive shaft or
other suitable support, as shown at 6.
91 - 2
Section F Transmission
9803/3280
Section F
91 - 2
Issue 1
Rear Axle - PD70, SD80
9 Match mark the brake piston housing 7 and the drive
head. Undo four capscrews 9 and remove the brake
housing and piston assembly.
Note: Do not disturb nut 10 otherwise the bearing pre load
will have to be reset.
11 Remove circlips 11, remove back off pins 12, tension
bushes 13 and springs 14.
12 Remove brake piston 15 from brake housing 7.
13 Remove and discard seals 16 and 17. Inspect the
housing bore for damage and scoring. Nicks or cuts in
the seals may be responsible for loss of brake fluid.
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