Manitowoc 999 Service And Maintenance Manual

Reference Only
Manitowoc Published 05-16-17, Control # 233-03 5-17
999 SERVICE/MAINTENANCE MANUAL HOISTS
5
SHEAVE, ROLLER, AND DRUM INSPECTION
Perform the following inspections WEEKLY.
1. Check the drum clutches and brakes for proper
adjustment.
2. Check all sheaves, rollers, and drums for the following
conditions:
- Unusual noises
- Freedom of movement—must turn freely by hand.
Wire rope may have to be loosened to perform this
inspection
- Wobble—must turn true with very little side-to-side
or up-and-down play
- Signs of rust (indicating that water may have
entered bearing)
- Grease leaks (indicating a faulty seal or water in
grease)
The above problems indicate bearing damage. If found,
the corresponding sheave, roller, or drum should be
disassembled for further inspection. New bearings
should be installed.
For sheaves not equipped with grease fittings, be sure to
pack new bearings with grease at assembly.
3. For steel sheaves, check depth, width, and contour of
each sheave using a groove gauge as shown in
Figure 5-13
. Replace sheaves that have over or under
size grooves.
4. Replace grooved drums that allow one wrap of wire rope
to contact next wrap as rope spools onto drum.
5. Inspect sheaves to verify they do not contact another
sheave or structural plate work. There should be uniform
clearance between sheaves in a cluster. Repair or
replace worn or damaged sheaves.
6. Re-machine or replace steel sheaves, drums, or rollers
that have been corrugated by the wire rope’s print as
shown in Figure 5-14
.
7. Inspect nylon sheaves for excessive tread diameter
wear at locations E in Figure 5-16
. Measure at three
places to check for uneven wear.
Wear must not exceed the limits given in the table.
Replace worn or damaged sheaves.
FIGURE 5-13
Observe groove to see if contour of gauge
matches contour at bottom of sheave groove.
Proper fitting sheave groove should support wire
rope or 135–150° of rope circumference.
Groove Too Small
Groove Too Large
135°–150°
FIGURE 5-14
“Corrugated” steel sheave,
roller, or drum will cause
wire rope to wear rapidly.

Manitowoc 999 Specifications

General

Brand	Manitowoc
Model	999
Category	Construction Equipment
Language	English