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Balance mechanism
7 To remove the balance mechanism (Fig 6.2):
7.1 Remove the platform (Para 3).
7.2 Remove the balance mechanism guide pin (Para 4).
7.3 Remove the tilt unit assembly (Para 5).
7.4 Remove three screws (33) which secure mechanism housing cover (30) to the mechanism
housing and lift out the mechanism housing cover complete with bearing (17).
7.5 Remove thrust bearing (23).
7.6 Remove three screws (27) which secure adjustment slide sleeve (21) in the mechanism housing.
From within the mechanism housing, push the adjustment slide sleeve out until the locating Spirol pin is
disengaged and remove the sleeve. Ensure that the mechanism housing and balance mechanism are
not damaged during removal of the adjustment slide sleeve.
7.7 Using circlip pliers, remove circlip (18) from the boss of RH side plate (15) and allow it to rest on
the end face of the boss.
7.8 Using hand pressure, push the balance assembly bodily into the mechanism housing to displace
RH side plate (15) outwards until the boss which projects through bearing (17) is level with the inner
face of the bearing.
7.9 Tilt the RH side plate counter-clockwise when looking on the open side of the mechanism
housing and lift the balance assembly out of the mechanism housing.
7.10 Remove two shim washers (40) from the balance assembly and circlip (18) from the mechanism
housing.
8 Disassembly of the balance mechanism is self evident (Fig 6.2), but the trunnion pins of spring actuator
(Part No. 3364-908SP) must not be removed. If the spring actuator is damaged or faulty it must be replaced.
NOTE: It is not necessary to remove the balance mechanism for access to the pan drag
mechanism.
WARNING!: Ensure that the mechanism housing and balance mechanism are not
damaged during removal of the adjustment slide sleeve.
WARNING!: Assembly of the balance mechanism requires special tools. Do not
dismantle unless necessary.
The spring actuator assembly (3364-908SP) requires special equipment for assembly
and should not be dismantled. If faulty, it must be replaced.
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