HOISTS 2250 SERVICE/MAINTENANCE MANUAL
5-32
Published 07-19-16, Control # 249-01
6. Re-machine or replace steel sheaves, drums, or rollers
that have been “corrugated” by the wire rope’s print as
shown in (Figure 5-30
).
NOTE: Depending on the type of wire rope used, it is
normal for nylon sheaves to show the wire rope
print. Do not re-machine nylon sheaves.
7. Inspect nylon sheaves for excessive tread diameter
wear at location E in Figure 5-32
. Measure at three
positions to check for uneven wear.
Wear must not exceed the limits given in the table.
Replace worn or damaged 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 actually moves to better support the
wire rope as the sheave wears normally.
Nylon sheave properties degrade in temperatures
above 60ºC (140°F).
8. Inspect nylon sheaves to verify they have not separated
and “walked off” the steel inserts or bearings
(Figure 5-31
). The maximum sideways displacement is
3 mm (1/8 in). Replace worn or damaged sheaves.
9. Make sure the sheaves, drums, and rollers are properly
lubricated. Refer to Lubrication
Section 9.
Many sheaves are not equipped with grease fittings, but
are packed with grease at assembly. Repack the
bearings of these sheaves with CraneLUBE 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 need to be
replaced.
FIGURE 5-30
S150
A “corrugated” steel sheave,
roller, or drum causes wire
rope to wear rapidly.
Steel Insert
or Bearing
Nylon
Sheave
Improper
Snap Ring
Engagement
FIGURE 5-31
1/8 in (3 mm)
Maximum Sideways
Displacement
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