11-51
5540F/YB5515 SERVICE MANUAL STRUCTURALS
BEARING, MAST AND RELATED PARTS
General
The mast is fastened to the main frame of the crane through
a bearing. The inner race of the bearing is fastened to the
mast and the outer race of the bearing is fastened to the
frame. See Figure 11-121.
The rotation of the mast is done by a gearbox which is
mounted below the frame deck. A hydraulic motor connected
to the gearbox provided power for rotation of the mast.
The bearing is filled with grease through two grease fittings
on the inner race of the bearing. A slotted hole in the mast
plate allows access to the inner race and the grease fittings.
C - The brake will not hold a load with
the control lever in neutral.
1. Excessive system back pressure
act in on the brake release port.
2. Friction brake will not hold due to
worn or damaged brake discs.
3. Brake clutch is slipping.
1. Same as Remedy 2 of possible
cause B2.
2. Same as Remedy 3 of Possible
Cause A2.
3. Improper planetary gear oil may
cause the brake clutch to slip.
Drain old gear oil and flush winch
with a suitable solvent.Thoroughly
drain the solvent and refill winch
with recommended planetary oil.
See Section 3.
D - The winch runs hot.
1. Excessively worn or damaged
internal winch parts.
1. Disassemble winch to inspect/
replace worn parts.
E - Winch “chatters while raising rated
load.
1. Hydraulic oil flow to motor may be
too low.
2. Hoist control being operated too
quickly.
1. Hydraulic pump not operating
efficiently.
2. Conduct operator training as
required.
F - The wire rope does not spool
smoothly on the drum.
1. Improper wire rope being used.
2. The winch may have been
overloaded, causing permanent
set in the wire rope.
1. Use only wire rope purchased
from Grove.
2. Replace wire rope.
Trouble Possible Cause Remedy
Reference Only
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