HOISTS 2250 SERVICE/MAINTENANCE MANUAL
5-10
Published 07-19-16, Control # 249-01
See Figure 5-8 for the remaining steps.
6. Check each brake band (6) for proper adjustment as
follows.
NOTE: Check the band adjustment when the linings (7)
are cold for lift-crane work or warm for duty-cycle
work.
a. Lower the load block, weight ball, or bucket to the
ground so the wire rope is slack on the drum being
serviced.
b. If equipped with three drums, use the drum selector
to select the desired rear drum, right or left.
c. Turn on Free Fall for the drum being serviced.
d. Release the drum working brake (brake pedal up
fully).
e. Turn on the drum park for the drum being serviced.
The drum park brake will spring apply.
f. Measure the distance from the bottom of the
actuator (9) to the top of the rod end (17) as shown
in View A.
Check for the following dimension:
- The dimension must be 51 to 63 mm (2 to
2-1/2 in).
g. Readjust the brake when 63 mm (2-1/2 in) is
reached.
If the proper dimension is not obtained, turn off the
drum park to release the brake for the drum being
serviced.
h. Tighten the band adjusting nut (5) one to two flats at
a time.
i. Repeat step 6
f through step 6h until the proper
dimension is obtained.
j. Turn off the drum park for the drum being serviced.
The drum park brake will release.
k. Check for clearance between the brake lining and
drum flange as follows:
- Grasp the brake band at the band adjusting nut.
The band should move back and forth freely by
hand.
- As a further check, the drum should turn freely
when the load line is pulled by hand (clutch and
park brake released). If the drum does not turn
freely by hand and the band is loose, the clutch
may not be releasing. See Inspecting and
Adjusting the Drum Clutch—Standard on page
5-16.
- If necessary, loosen the jam nut (3) at the band
supports (2). Turn the adjusting nuts (3) in the
required direction to provide clearance between
the lining and drum flange. Securely tighten the
jam nuts to lock the adjustment.
l. For an independent drum drive, repeat step 6
d
through step 6k for the brake on the opposite side.
The dimension measured in step 6
f must be
identical for each brake on the drum to provide
balanced braking.
7. Band adjustment is now complete. Select and confirm
the desired operating mode.
CAUTION
Drum Flange Damage!
If the brake lining rubs against the drum flange when the
brake is release, the lining will overheat, possibly resulting
in cracks in the drum flange.
After adjustment procedures, make sure the brake lining
does not rub on the drum flange.
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