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(2) Make sure power to the hoist is off and
locked out.
(3) Remove the four (4) bolts attaching the
fan shroud to the motor and remove the
fan shroud. See Figure 5-9.
(4) Carefully roll the large O-ring from the
groove over the air gap back toward the
magnet body. Do not excessively stretch
this O-ring.
(5) Measure the air gap using feeler gages.
If the air gap exceeds the maximum
value shown in Table 5-1, the air gap
must be reset.
(6) To measure the thickness of the friction
disk, it is necessary to remove the brake
body from the motor end bell. Remove
the three (3) brake mounting bolts and
draw the brake body away from the
friction disk. Carefully set the brake body
down on the motor shaft directly in front
of the fan. Draw the friction disk away
from the end bell and measure the
thickness over the friction surfaces. If the
friction disk thickness is less than the
minimum shown in Table 1, it must be
replaced. See Section IX, Figure 9-10. If
the friction disk thickness is within the
allowable, reassemble the brake body to
the motor end bell and torque the
mounting bolts to the value shown in
Table 5-1. Whenever the friction disk is
replaced, it is necessary to reset the air
gap.
Hoist "B" Frame "C" Frame
Mounting Bolt
Torque
18 ft-lbs. 18 ft-lbs.
Nominal Air Gap
0.016 in. 0.016 in.
Maximum Air Gap
0.031 in. 0.035 in.
Minimum Brake
Disk Thickness
0.453 in. 0.472 in.
Table 5-1. Motor Brake Data.
(7) To reset the air gap, begin by releasing
the (3) mounting bolts 1/2 turn. Turn the
hollow spacer bolts into the magnet body
approximately 1/4 turn. Retighten all
three mounting screws. Measure the air
gap at a minimum of three places around
the circumference. Threading the hollow
spacer bolts into the magnet body will
decrease the air gap while backing these
spacer bolts out of the magnet body will
increase the air gap. Repeat this step as
necessary until the required air gap is
achieved. The air gap must be the same
all the way around the brake. Once the
air gap is correct, torque the mounting
bolts to the value shown in Table 5-1.
(8) Replace the large O-ring over the air gap
and reassemble the fan shroud to the
motor.
(9) Test hoist per Section V, Paragraph 5-13
to ensure proper brake operation.
c) Brake Disassembly
.
(1) Lower hook block to the floor and relieve
all load from ropes.
(2) Make sure power to the hoist is off and
locked out.
(3) Remove the four (4) bolts attaching the
fan shroud to the motor and remove the
fan shroud. See Figure 5-9.
(4) Remove the snap ring behind the plastic
fan. Carefully remove the fan from the
motor shaft. Remove the snap ring in
front of where the fan was mounted.
(5) Disconnect the two wires from the
terminal block on the magnetic body.
(6) Remove the three mounting bolts that
attach the brake body to the motor end
bell and remove the brake body from the
motor. Remove the friction disk from the
motor shaft.
(7) Clean and inspect all components and
working surfaces. Replace all damaged
or worn components as necessary.
Measure friction disk thickness and
replace if less than the minimum
thickness shown in Table 5-1.
d) Brake Re-assembly
.
(1) Install the friction disk on the splined hub.
The friction disk must slide on the splined
hub and seat against the end bell of the
motor.
(2) Install the brake body to the motor end
bell using the three (3) mounting bolts.
The air gap must be reset as described in
Section V, Paragraph 5-10.b. Torque the
mounting bolts to the values shown in
Table 5-1. Install the large O-ring in the
groove over the air gap. Ensure this O-
ring is not pinched in the air gap.