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14 To assemble the pan unit (Fig 6.3):
14.1 Degrease four screws (1).
14.2 Install bearing (11) in constant drag assembly (12), ensuring that it is fully seated.
14.3 Ensure that both faces of pan brake disc (10) are free from grease and position the pan brake
disc and pan brake clamp (9) on boss of constant drag assembly (12), ensuring that it is fully seated.
Rotate both components to align holes for screws and Spirol pins, noting that there is only one position
in which all the holes are aligned.
14.4 Secure pan brake disc (10) and pan brake clamp (9) to constant drag assembly (12) with six
screws (7). Do not tighten the screws at this stage.
14.5 Install two Spirol pins (8) through pan brake clamp (9) and pan brake disc (10) into constant drag
assembly (12) ensuring that ends of Spirol pins are driven flush to surface of clamp. Tighten six screws
(7). Ensure both faces of pan brake disc are free from grease.
14.6 If removed, install dowel pin (32) in seating for pan brake plate (32) in underside of mechanism
housing (6) using Loctite 601.
14.7 If separated, assemble steel ball (35) into pan brake cup (33) using Loctite 415.
14.8 Ensure that the end face of pan brake cup (33) is free from grease. Apply a small quantity of
white bearing grease to the bore for the pan brake cup in the underside of mechanism housing (6) and
install the pan brake cup with the steel ball inwards.
14.9 In constant drag assembly (12), identify the single 3.3mm (0.130in.) diameter hole which lies
between two of the six 3.3mm (0.130in.) diameter holes for the fixing screws. Pass a 2.5mm hexagon
wrench through this hole so the end appears close to the pan brake disc.
14.10 Position screw (36) in the countersink of pan brake plate (31). Holding the screw by the thread,
slide the chamfered corner of the pan brake plate between the pan brake disc and the pan top plate
and engage the socket in the screw head on the hexagon wrench.
14.11 Locate the constant drag assembly on the pan axis spigot, turn it to align the thread of screw (30)
with the hole in the underside of the mechanism housing and start the screw. Guide the pan brake plate
onto dowel pin (32) and push bearing (11) in the constant drag assembly onto the pan axis spigot whilst
turning screw (30) into the mechanism housing.
14.12 Ensure that bearing (11) is fully seated and tighten screw (30).
14.13 If constant drag assembly (12), labyrinth (14) or spacer (28) has been replaced it will be
necessary to check that the thickness of shim pack (27) is correct. Otherwise, examine the shims for
damage and replace as necessary. Do not use any shims that are not completely flat. Use a micrometer
to measure the thickness of an undamaged area of the old shim and select a replacement of the same
thickness.
14.14 To adjust the thickness of the shim pack:
14.14.1 Fit the 3 mm setting piece to the shim setting tool (T61463) and fully tighten the screw,
Zero the dial indicator. Remove the setting piece.
14.14.2 Ensure that spacer (28) is positioned on the pan axis spigot, with the counterbore
towards the constant drag assembly, then install the mechanism housing in the shim setting tool.
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