1998-08-034 MAC 500
section 2
PARTS REMOVAL AND INSTALLATION
2.1 L
OCTITE
THREAD
LOCK
2.1.1 E
XTENT
OF
APPLICATION
Loctite thread lock is used on all machine screws (this does not include self-tapping or sheet metal screws) to lessen the prob-
lems due to the loosening of screws under transport and with time. The thread lock must be reapplied if the screws are loosened
or removed for service.
Two types of Loctite are in use, and are available from Martin Professional. Set screws securing wheels to motor shafts are
secured with the lighter, green, Loctite 290 (P/N 400533). All other screws are treated with the heavier, blue, Loctite 243 (P/N
400531). Both are available in 10 ml tubes.
2.1.2 M
ETHOD
OF
APPLICATION
Be careful to avoid getting any material on shafts or axles. A needle and syringe makes an idea application tool.
Long set screws: Start the screw and turn it until it contacts the shaft. Back the screw 2 turns, apply a small drop or 2 of Loctite
290 to the threads, and then tighten the screw as you normally would.
Short set screws: Back the set screw out of the adaptor until 2 threads stick out of the shaft. Apply a small drop or 2 of Loctite
290 to the threads, and then tighten the screw within 60 minutes.
Other metric screws: Apply a drop of Loctite 243 (blue) to 3 or 4 threads, or spread a thin stripe with a syringe, before starting
the screw.
2.2 R
EPLACING
T
APTITES
Taptites are not fully round and thus do not have the same strength as regular metric hardware. They are selected, after careful
consideration by R&D, for their excellent thread-cutting abilities.
Taptites shall not be reused in critical locations. Problems can be avoided with the following practice:
Change to metric hardware of the same size when reinstalling used parts originally held with taptites. For the pan/tilt motors,
use M5 x 16 mm allen head bolts, P/N 360855.
Use new taptites when installing new parts. Do not use old taptites to cut new threads! For pan/tilt motors use M5 x 12 mm tap-
tites, P/N 361800.
If the threads in the motors are stripped, use a smaller screw (M4) and a lock nut.
2.3 S
EPARATING
MAIN
ASSEMBLIES
2.3.1 R
EMOVE
HEAD
FROM
YOKE
1. Remove color and gobo modules. Refer to sections 2.4 and 2.6.
2. Disconnect wires from starter.
3. Cut the ties holding wires to the chassis; pull the wires out through the tilt bearings on both sides.
4. Remove the screws holding the head to the tilt bearings and remove the head. These screws are locked with
Loctite and may be difficult to remove - use a screwdriver in good condition.
5. Installation is the reverse of the above.
2.3.2 R
EMOVE
YOKE
FROM
BASE
1. Remove the plastic covers from both arms.
2. Disconnect the lamp wires from the connection block.
3. Clip the tie holding the lamp wires to the wire bundle leading into the head.
4. Unplug all wires leading into the base from both sides of the yoke.
5. Remove the tilt-reset switch wires and cut the tie binding them to the wires leading into the head.
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