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to overhaul, repair or replace components on these heads. The special tools and consumable materials
required for work on Vision SD12 heads are listed in Section 3 - Tools and Materials.
Disassembly
Platform
3 To remove the platform (Fig 6.2):
3.1 Remove platform slide (1) (See “Operation checks” on page 15).
3.2 Remove graphic (37).
3.3 Remove one screw (36) and four screws (4), noting that all these screws are secured with
Loctite. Carefully lift the LH side of the platform and retain the platform slide release spring (35) which
will be released as the platform is lifted.
3.4 Turn the platform slide clamp lever (12) upwards and separate the platform from RH side plate
(15).
3.5 Remove the platform slide release (34) by feeding it up through the hole in the platform.
Balance mechanism guide pin
4 To remove the balance mechanism guide pin (Fig 6.2):
4.1 Turn the balance knob (24) counter-clockwise until it is unloaded.
4.2 Prise up a corner of balance graphic (26), remove it completely and discard it.
4.3 Using circlip pliers, remove Spirol ring (25) from the groove in mechanism housing (16) and allow
it to rest on the neck of balance knob assembly (24).
WARNING!: To prevent damage to socket screw heads, use the correct hexagonal
wrenches and ensure they are in good condition
WARNING!: The labyrinth assembly (3364-44), the constant drag assembly (3364-45)
and the spring actuator (part no. 3364-908SP) require special equipment for assembly
and should not be dismantled. Any faulty assembly must be replaced. If the labyrinth
assemblies, constant drag assemblies or spacers (3364-300) are replaced, it will be
necessary to adjust the thickness of the pan shim pack (Para 14.14) or tilt shim pack
(Para 17.18). This requires the use of shim setting tool (T61463).
WARNING!: Before attempting to remove the tilt unit assembly or the RH side plate, the
balance mechanism guide pin must be removed to release the preload on the balance
mechanism. Failure to release the balance mechanism preload may result in serious
damage to the head.
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