STRUCTURALS CD5515-2/YB5515-2 SERVICE MANUAL
11-24 Published 1-20-2017, Control# 483-02
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
frame and the outer race of the bearing is fastened to the
mast. See Figure 11-18.
The rotation of the mast is done by a gearbox which is
mounted below the frame deck. A hydraulic motor connected
to the gearbox provides 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.
Mast Bearing
The bearing is a ball thrust bearing. The outer race rotates
outside of the inner race on a row of steel balls.
Apply grease weekly or every 50 hours of operation,
whichever occurs first. Use a Lithium based, E.P. No. 2
bearing grease, or equivalent.
There are two grease fittings to grease the bearing and they
are directly across from each other. Rotate the mast until the
access hole (Figure 11-19) aligns with the grease fitting.
Apply grease to the bearing. Rotate the mast through several
rotations and then repeat the procedure with the other
grease fitting. The excess grease will extrude out of the
bearing seal.
FIGURE 11-18
a0490
Cross Section of Mast Bearing
Reference Only
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