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17.10 Remove screw (28) from coupling seal disc (33) to release coupling (29). Remove and discard
'O' ring (30) from coupling.
17.11 Remove friction shoe assemblies (7) from drag plate subassembly (16). Remove locknut (36)
from adjuster shaft (37) and unscrew shaft to free trunnions (5,6)
17.12 If required, remove two pivot pins (35) from drag plate subassembly (16). These pins are
secured with Loctite.
17.13 Remove screw (24). Remove four-hole mounting plate (22) complete with brake disc clamp/
thrust bearing guide ring (19) and pan brake/ lower thrust bearing race disc (26).
17.14 Remove eight screws (23) securing pan brake/ lower thrust bearing race disc (26) and brake disc
clamp/thrust bearing guide ring (19) to four-hole mounting plate (22). Drive out two Spirol pins (20).
17.15 Remove thrust race (27) and upper thrust bearing race disc (17) from drag plate subassembly
(16).
17.16 Pull off friction drum (8), complete with omniseal (9) and bearing (10). Discard omniseal. Remove
two dowel pins (21).
17.17 Remove circlip (11) and 'V' ring (12) from brake plunger. Remove and discard 'O' ring (13) from
the boss in the drag plate subassembly (16). Remove self-locking ring (14) and spring (15) from each
pillar of the brake shoe assembly (18) and remove brake shoe assembly from the drag plate
subassembly (16).
Assembly
NOTE: All 'O' rings, seals and spring clips removed during disassembly should be renewed.
Pan drag/brake mechanism
18
To assemble the pan drag/brake mechanism, proceed as follows
18.1 Lightly lubricate face of omniseal (9) with LM grease and instal on friction drum (8), ensuring
omniseal is correctly oriented - open side towards drum top surface. Lubricate bearing (10) with LM
grease and install on friction drum (8).
18.2 Install trunnions (5,6) in friction shoe assemblies (7), ensuring that left-hand-threaded trunnion
(6), indicated by turned ring, is installed in left-hand friction shoe. Install adjuster rod (37) and locknut
(36), noting that the locknut has a left-hand thread. Ensure unthreaded length of adjuster rod is central
to friction shoes.
NOTE: Ensure grease does not contaminate brake surface of brake shoe assembly (18).
18.3 Sparingly lubricate the shaft and pillars of brake shoe assembly (18) with LM grease and install in
the drag plate subassembly (16). Install spring (15) and self-locking ring (14) on each pillar of the brake
shoe assembly. Install 'O'' ring (13) over the boss in the drag plate subassembly (16). Install 'V' ring
(12) and circlip (11) on brake plunger, ensuring 'V' ring is correctly oriented.
18.4 Install assembled friction drum in the drag plate subassembly (16).
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