SUBSECTION 8C
BOOM HOIST SHAFTS
GENERAL
DISASSEMBLY. To disassemble the boom hoist shaft and
the drum and planetary assembly, proceed as follows (see
This subsection contains the information necessary to re-
move, repair and install the boom hoist shaft assembly.
1. Remove retainer (48) from the planetary drum assem-
BOOM HOIST SHAFT (2100J1132-1 & 5)
bly.
GENERAL. The boom hoist shaft is driven by the worm
2. Pull gear (50) from drum (34). Remove pins (54) from
shaft, which meshes with the worm wheel on the boom
drum (56) and remove the pinions from the drum.
hoist shaft. Chains, sprocketed to the boom hoist shaft, pro-
vide power for the swing shaft and main hoist shaft. When
3. Remove the bearings from drum (34) and (56). Do not re-
replacement of the worm wheel, worm shaft or sprockets is
move seal (38) unless replacement is required.
necessary, the boom hoist shaft must first be removed.
4. Remove seal (45) and bearing (49) from retainer (48).
REMOVAL. To remove the boom hoist shaft, proceed as fol-
INSPECTION AND REPAIR. Before installing the boom hoist
1. Replace all oil seals and O-rings. Any bearing which
1. Remove the third drum material. See Subsection 7B.
shows signs of wear or damage should be replaced.
2. Disconnect and cap all the hydraulic lines to the drum-
NOTE
shaft assembly. Plug all connections where the hydraulic
lines are removed. Also remove any hydraulic lines which
Replacement of seal (38) is necessary only if the seal
might interfere with drum shaft removal.
has been leaking or is damaged.
3. Disconnect and remove all brake bands on the boom
2. Inspect the bushings in pinions (52) for wear or damage.
hoist drum (see Subsection 8D).
3. Inspect worm wheel (30), sprockets (29), gear (50) and
4. Remove the hydraulic swivel from the end of the shaft.
pinions (52) for wear or damage. If they are scored, pitted,
ridged or worn, they should be replaced.
5. Remove nut (39) and washer (40) and spacer (41) from
shaft (33).
4. Inspect the shaft for excessive wear and/or distortion.
6. Remove sleeve (05) and spacer (04).
5. Clean out all lube lines and grease passages to insure
free flow of lubricant.
7. Remove clutch assembly and O-ring (37). Place clutch in
a clean area.
6. Repair or replace any damaged or broken parts. Be sure
all threaded items are clean and that threads are not dam-
8. Support the drum and planetary assembly with a hoist
aged. Studs must be tight before installing parts that are
and slide it off of the shaft. Remove bearing (21) from the
mounted to them.
shaft.
7. Inspect all clutch and brake linings at this time. Replace
9. Remove the chain case cover, loosen both drive chains
the linings, if necessary, before installing them on the drum
and remove the chains from the boom hoist shaft drive
shaft.
sprockets. It is not necessary to disconnect the chains.
8. Inspect the drum cooling fins for cracks or broken fins.
10. Block both ends of the boom hoist shaft and remove the
Repair or replace if necessary.
hardware holding retainers (11 and 27). Remove the
9. Inspect the brake and clutch rims for cracks, scratches,
retainers with shims (07 and 24), gaskets (14 and 17), and
or discoloration. Repair or replace if necessary.
retainers (06 and 23) intact.
11. Lower the shaft enough to disengage worm wheel (30)
from the worm shaft.
ASSEMBLY AND INSTALLATION. To assemble, and install
12. Remove shaft (33) through the opening in the left side
of the chain case.
1. Lubricate all O-rings and seals prior to assembly.