Drive Motor Assembly - IBM System/34 Maintenance Manual

10-100 DRIVE MOTOR ASSEMBLY
Reinstalling the Drive Motor Assembly
Removing the Drive Motor Assembly
The drive motor assembly includes the following
field-replaceable units; the motor, the pulley, and the
motor mounting bracket.
1. Set Power to
0
(operator panel).
2. Set CB1 off (see paragraph 05-310 for the
location of CB 1).
DANGER
CB1 must be off to remove AC voltage from
this circuit.
3. Loosen the two screws e and e and remove the
belt guard
O.
4. Lift the motor
41»
against the belt tensioner spring
CD.
When the pin
0
in the shaft. is free of the-
opening
e,
turn the shaft 90 degrees to hold the
spring. Lower the motor until the belt supports it.
5. Remove the two screws
0
and the belt tensioner.
6. Remove the screw. and the cover
G
from TB 1.
7. Disconnect the two system wires
e
and the AC
ground wire
e.
8. Remove the pivot pin clip
e
from the motor
bracket pivot pin.
9. Take the weight of the drive motor in your left
hand, remove the belt
0,
and push
the
motor
toward the disk enclosure uritil the pivot pins
0
are free of their holes. Lift out the motor
assembly.
Note: The motor pivot bushings
G
could fall off
as the motor is removed.
10. Remove and inspect the motor bushings
G.
If
they are damaged, install new bushings.
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
14
10-100
Check that the motor pivot bushings
G
are not
damaged and are in the pivot holes.
Guide the motor assembly pivot pins
0
into their
holes and slide the assembly away from the disk
enclosure.
Reinstall the pivot pin clip
e.
Lift the motor
41»
against the force of the belt
tensioner spring
CD,
reinstall the belt
0
on the
pulleys, and lower the motor until the belt is tight.
Note: Reinstall the smooth side of the belt against
the pulleys and center the belt.
Ensure that the pin in the shaft is holding the belt
tensioner spring (see step 4 of Removing the Drive
Motor Assembly).
Locate the two screws
0
in the belt tensioner
assembly but do not tighten.
Adjust the belt tension.
a. Locate the belt tensioner with no gap at
G
and
tighten the screws
O.
b. Lift the motor against the belt tensioner spring
CD
and turn the shaft. 90 degrees to place
the pin
0
in the opening
e.
c. Lower the motor.
Note: The belt tensioner bracket. must overlap
the motor bracket
e.
Connect the two system wires
e
and the AC
ground wire
e.
Locate the screw. through the TB 1 cover
G
and tighten the screw.
Reinstall the belt guard
0
and tighten the screws
eande·
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