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52.7 Remove brake housing body-tilt (99) with tilt brake shaft (103), shim (104), and brake segment
assembly (6). Remove brake flange assembly (101) via the access hole.
52.8 Remove snap ring (83).
52.9 Withdraw tilt drag unit assembly (100) and remove bearing shield (66).
53 If it is required to service the tilt drag unit assembly in situ refer to Para 51. Precautions must be taken
to prevent fluid contamination of other components.
Dismantle
54 To dismantle the tilt drag unit assembly continue as follows (Fig 6.5):
54.1 Support the assembly over a shallow tray to catch the lubricating fluid.
54.2 Unscrew and remove M2.5 Posidriv countersunk head bleed screw (156).
54.3 Unscrew and remove eight M3 socket countersunk head screws (155) from the periphery of top
plate (154). Remove top plate (154) anticipating possible fluid loss as this is done.
54.4 Remove omniseal (153) and inspect for deterioration.
54.5 Remove the drag unit from tilt drag housing (141).
54.6 Unscrew and remove four M5 socket button head screws (14) and remove friction shoe carrier-
lower (152).
54.7 Remove friction shoe carrier-top (142) from drag actuator shaft (149).
54.8 Remove ’O’ rings (148) and inspect for deterioration.
54.9 Further dismantling of the tilt drag unit, if necessary, is self-evident.
Assemble
55 The tilt drag unit assembly is assembled as follows:
55.1 Lightly apply white bearing grease to all moving contact surfaces particularly ’O’ rings (148),
friction shoe assembly (144) pivot blades, friction shoe pivots (143), and omniseal (153). Lubricate
each end of actuator rods (151) with Vinten Fluid No. 3.
55.2 Reassemble any parts of the tilt drag unit dismantled at Para 54.9.
55.3 Fit ’O’ rings (148) into the internal grooves of friction shoe carrier-top (142).
55.4 Ensure spirol pins (111) in the outer face of friction shoe carrier-top (142) project 3.5mm.
55.5 Fit friction shoe carrier-top (142) over drag actuator shaft (149) locating dowel (147), and friction
shoe pivots (143) correctly into the carrier (142).
55.6 Locate friction shoe carrier-lower (152) over spirol pins (111) and friction shoe pivots (143),
secure friction shoe carrier-lower (152) with four M5 socket button head screws (14) removed at Para
54.6. Secure screws with Titanine.
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