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18.5 Install two dowel pins (35) in the drag plate subassembly (16). Do not use any adhesive on pins.
18.6 Fit dummy lid (3354-930TL) to drag plate subassembly (16). Using a screwdriver in the slot in
adjuster rod (37), tighten friction shoes so that they centralize around friction drum (8).
18.7 Install 'O' ring (30) on coupling (29) and install in coupling seal sleeve (33). Install drag coupling
screw (28) in coupling seal sleeve, ensuring point engages in groove in coupling (29). Install 'O' ring
(34) in face of coupling seal disc, using LM grease to retain 'O' ring.
18.8 Screw coupling (29) onto adjuster rod (37), ensuring that drag coupling screw (28) engages in
slot in drag plate subassembly (16). Secure coupling seal sleeve (33) with wave washer (32) and circlip
(31).
18.9 Adjust coupling (29) so that drag coupling screw (28) is central in groove in coupling, then lightly
tighten locknut (36).
18.10 Remove drag coupling screw (28) and unscrew and remove coupling (29). Apply Loctite 638 to
thread of coupling (29) and refit to previous position. Tighten the locknut to a torque of 5.65 Nm
(50 lbf in.) and refit drag coupling screw (28).
18.11 Remove dummy lid.
18.12 Turn assembly upside-down. Install upper thrust bearing race disc (17) on drag plate
subassembly (16), using LM grease to retain disc. Lightly lubricate thrust race (27) with LM grease and
install on drag plate subassembly (16).
NOTE:
Do not allow grease to contaminate the braking surfaces of the brake disc (26).
18.13 Install pan brake/lower thrust bearing race disc (26) and brake disc clamp/thrust bearing guide
ring (19) on four-hole mounting plate (22). Secure lightly with eight screws (23), then install two Spirol
pins (20), ensuring pins are underflush with top face of guide ring (19). Tighten screws (23).
NOTE: Pins (21) must be a tight fit in both four-hole mounting plate and friction drum.
18.14 Install assembled four-hole mounting plate onto thrust race (27) on drag plate subassembly (16)
and secure lightly with screw (24). Install two dowel pins (21), ensuring pins are underflush with lower
face of four-hole mounting plate (22).
NOTE: Screw (24) is tightened during final assembly of the head.
18.15 Turn assembly right way up. Fill drum enclosure with 60ml of Vinten fluid No. 3.
18.16 Install three 'O' rings (38) in recesses in drag plate subassembly (16).
18.17 Install 'O' ring (4) in groove in lid/rivet bush assembly (1) and secure lid/rivet bush assembly to
drag plate subassembly (16) using three screws (39) and Loctite 222E.
18.18 Install bonded seal (3) and screw (2) in lid/rivet bush assembly (1).
18.19 Position brake reaction plate (25) over four-hole mounting plate and align holes in reaction plate
with those in drag plate subassembly.
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