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4.4 ACTUATOR ASSEMBLY
4.4.1 Actuator Components - Handling
Carriage or leadscrew parts (Figure 2-25) are not field
replaceable units; if they are defective, change the
complete actuator assembly. Handle and store all parts
of the actuator assembly with extreme care. In
particular, keep the leadscrew, follower wheels, linear
ball slides, drive disk, and drive tire free of damage or
contamination.
4.4. 1. 1 Removal
If data is to be recovered from the fixed disk, do this
before actuator removal, if possible; otherwise, refer to
1.5 to attempt recovery after actuator replacement.
A T-handle wrench, part 46094 7, is· held at branch
offices to facilitate actuator screw removal where
enclosures make entry to the base of the 5444 difficult.
1. Turn off power.
2. Remove drive belt (see 4.2.7). This action allows the
idler to retract and give access to hexagon socket
screws that hold actuator.
3. Disconnect plugs 13, 14, and JS from de box.
4. Ensure that carriage is fully retracted then remove
read/write head arms (see 4.7.1.4).
5. Disconnect head-load cable (see 4.8.1.2).
6. Open CE panel (on de box cover) and hinge back to
2-22
(5/70)
allow room for actuator assembly to be withdrawn.
Remove motor upper oiling spout from drive motor.
7. Remove
three
actuator holding screws (using
T-handle wrench, part 460947), slightly lift actuator
assembly to bring its locating dowel clear of base
casting, and carefully withdraw assembly.
8. Protect assembly m a dust-proof bag while out of the
machine.
4.4.1.2 Replacement
Only actuator assemblies with adjustable layshafts are
supplied to the field for replacement.
Note: The carriage inner limit stop shaft on the actuator
casting (see Figure 2-25) is factory-set to track
207~
and
should only be moved during conversion for a 5444
Model
1
(see 4.4.2) or during actuator alignment on a
Model
1
(see 4.4.1.3).
1. Check that read/write head arms are removed and
that carriage is fully retracted.
2. Make sure that mating faces of actuator and base
casting are clean. Insert actuator assembly through
casting and locate by the dowel (see Figure 2-26).
3. Hand tighten the three socket holding screws. Use
T -handle wrench, part 46094 7, if necessary.
4. Refit upper oiling spout on drive motor, with the
hollow facing downwards.
5. Proceed with alignment, see 4.4.1.3.
Carriage
Inner Limit Stop Shaft
Figure 2-25.
Actuator Carriage Assembly
[07478]
Lead screw
Follower Wheel
Rollers (2)
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