Manitowoc Published 05-03-17, Control # 228-03 5-15
16000 SERVICE/MAINTENANCE MANUAL HOISTS
8. Inspect nylon sheaves to verify they have not separated
and “walked off” steel inserts or bearings as shown in
Figure 5-12
. Maximum sideways displacement is 3 mm
(1/8 in). Replace worn or damaged sheaves.
NOTE: Depending on the type of wire rope used, it is
normal for nylon sheaves to show the wire rope
print. Do not remachine nylon sheaves.
NOTE: Nylon sheaves cannot be accurately inspected
using conventional methods such as sheave
gauges.
Due to the characteristics of nylon sheaves, the
nylon material will actually move to better support
the wire rope as the sheave wears normally.
Nylon sheave properties will be degraded in
temperatures above 60° C (140° F).
9. Make sure sheaves, drums, and rollers are properly
lubricated according to the instructions in the lubrication
guide provided with the crane (see Section 9).
NOTE: Many current production sheaves are not equipped
with grease fittings, but are packed with grease at
assembly. Repack the bearings of these sheaves
with Crane LUBE EP #2 grease when the sheaves
are overhauled.
Due to application and design variations, it is not
possible to give specific grease repacking intervals
or the life expectancy of components.
NOTE: For some sheaves, the seals are an integral part of
the bearing. Therefore, if a seal is damaged during
repacking, the complete bearing may have to be
replaced.
FIGURE 5-12
Item Description
1 Nylon Sheave
2 Improper Snap Ring Engagement
3 Steel Insert of Bearing
4 1/8 in (3 mm) Maximum Sideways Displacement
1
3
2
4
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