SUBSECTION 8D
BOOM HOIST BRAKES
NOTE
16. Connect the cables to lever (50) with pins (22 and 45)
and adjust the other pawl linkages as described in Subsec-
If difficulty is encountered when pushing pin (57)
tion 8F.
through the operating mechanism, connect the hy-
draulic line and operate the cylinder to align bracket
17. After testing and adjustments are completed, replace
(70) with the pin.
any panels or sheet metal removed.
7. Place spacer (01) and pawl (56) in alignment and push
the pin all the way into the support bracket on the chain
ADJUSTMENTS. To adjust the boom hoist brakes when the
case.
bands have been removed, proceed as follows:
8. Pull assembly pin (71) from bracket (70) of the drum
1. To adjust the spring set boom hoist brake, proceed as fol-
brake operating mechanism. Again it may be necessary to
actuate the cylinder to free the pin.
A. With the brake set (hydraulic pressure released from the
9. Insert rod end (61) into pin (57) and secure with locking
cylinder) tighten the brake band adjusting nut until the
capscrew (62).
brake spring length is 7-3/8".
10. Hook spring (17) into the bracket of upper band (05). In-
B. Test the adjustment by releasing and setting the brake
stall pin (21) and attach the other spring (17) to it.
and remeasuring the spring length.
11. Attach studs (18) to springs (17). Install washers (19)
and nuts (20); then, tighten the nuts to ensure the return of
the piston in the cylinder (see step 2A under the following
2. To adjust the boom hoist planetary brakes, proceed as
topic, ADJUSTMENTS).
12. Install adjusting bolts (10 and 77) from the bottom
bands, springs (09 and 76), spacers (08 and 75) and nuts (07
A. Using the jam nuts on top of the support bracket, adjust
and 74).
the return springs so that the support bracket is firmly
resting on the support pin.
13. Adjust the boom hoist and planetary brakes as de-
scribed under the following topic, ADJUSTMENTS.
B. With the brake applied (hydraulic pressure applied),
14. Remove the caps and plugs from all hydraulic lines and
check the planetary brake cylinder piston extension.
connections. Attach the hydraulic lines.
This dimension should be approximately 1/2 inch. Ad-
just to this dimension using the adjusting bolt at the
15. Bleed the hydraulic cylinders to remove any air in them
band split.
and the lines. See the bleeding procedure in Subsection 5A.
NOTE
C. Operate the brake several times to be sure the bands do
not drag when the brake is released (hydraulic pressure
The springs at either ends of the pawls were adjusted
released). Repeat steps 1 and 2 if necessary.
in step 1.
8D-5