SUBSECTION 7B
DRUMSHAFTS
GENERAL
1. Place the hoist drum assembly on a work bench with
clutch drum (39) facing up.
This subsection contains the information necessary to
remove, disassemble, repair, assemble, and install the
2. Remove capscrews and washers (42), then retainer (41).
main drumshaft and third drumshaft.
3. Pull clutch drum (39) from brake drum (37), taking care
not to damage seal (38).
4. Remove pins (35) and pinions (36) from drum (39).
DRUMSHAFT (2100J974)
5. Separate sun gear (34) from drum (39).
REMOVAL. To remove the main drumshaft, proceed as fol-
lows (see Figure 7B-1):
6. Remove seal (46), bearings (47 and 49) and spacer (48)
from drum (39). Do not remove seal (38) unless condition
1. Disconnect and cap all hydraulic lines to the drumshaft
indicates replacement is required.
assembly. Plug all connections where hydraulic lines were
removed. Also remove any other hydraulic lines which
INSPECTION AND REPAIR. Prior to assembly, all drum-
might interfere with the drumshaft removal.
shaft parts should be inspected as follows:
2. Remove the chain case cover, loosen the drive chains.
and lift the chain off the sprocket of the shaft assembly to be
1. Replace all oil seals and O-rings. Any bearing which
removed (see Subsection 4E).
shows signs of wear or damage should be replaced.
3. Disconnect and remove all brake bands on the drum-
shaft assembly. See Subsection 7C.
NOTE
4. Remove hydraulic swivels (01 and 53) from the ends of
Replacement of seal (38) is necessary only if the seal
the shaft.
has been damaged.
5. Remove locknut (52), lockwasher (51) and washer (50)
from shaft (22).
2. Inspect the bushings (54) for wear or damage. Replace if
necessary.
6. Remove the clutch assembly and place it in a clean area.
3. Clean out all lube lines and grease passages to insure
7. Support the drum assembly with a hoist and slide it off
free flow of lubricant.
the shaft. Keep clutch drum (39) facing up.
4. Inspect all the pinions and gears for wear or damage. If
8. Place blocking under shaft (22).
they are scored, pitted, ridged or worn, they should be re-
9. Remove nuts (30). washers (29) and retainers (27). Also,
placed.
remove shims (28).
5. Repair or replace any damaged or broken parts, Be sure
10. Remove bearings (23) from shaft (22). Remove spacers
all threaded items are clean and that threads are not dam-
(21).
aged. Studs must be tight before reinstalling parts that are
mounted to them.
11. Repeat steps 5 through 10, as applicable, and remove
6. Inspect all clutch and brake linings at this time. Replace
the left main drum.
the innings, if necessary, before reinstalling them on the
12. Remove the blocking and push the shaft out of the
drumshaft.
chain case. Support sprockets (20) and remove through the
chain case cover.
7. Inspect the drum cooling fins for cracks or broken fins.
Repair or replace if necessary.
8. Inspect the brake and clutch rims for cracks, scratches,
DISASSEMBLY. To disassemble the hoist drum, proceedas
or discoloration. Repair or replace if necessary.
follows (see Figure 7B-1):
