Manitowoc Published 06-24-16, Control # 241-01 4-93
2250 OPERATOR MANUAL SETUP AND INSTALLATION
LOWER BOOM POINT SHEAVES
General
See Figure 4-50 for the following information.
The lower boom point of the #44 or #44A boom with heavy lift
top is equipped with nine sheaves (three clusters with three
sheaves).
Each sheave cluster is retained on a separate shaft with a
spanner nut. The sheave clusters are supported by saddles
and retained in the lower boom point with a bolt and elastic
stop nut.
The outer two sheave clusters must be removed before the
crane can be operated with some boom lengths. See the
Capacity Chart to determine which boom lengths require
removal of the outer sheave clusters.
Removing Outer Two Sheave Clusters
See Figure 4-50 for the following procedure.
Perform the following steps prior to installing the boom top
when assembling the boom and prior to lengthening the
boom to a length that requires the outer two sheave clusters
to be removed.
1. Position the boom top or boom so the rope guards are
just touching the ground.
2. Remove the screws fastening the outer two rope guards
to the boom top.
3. Raise the boom top or boom until the lower boom point
is clear of the rope guards.
4. Remove and store the rope guards.
5. Position the boom top or boom so the center rope guard
is just touching the ground.
6. Remove the elastic stop nut and bolt.
7. Push or pull both outer sheave clusters from the lower
boom point and store them.
8. Install a spacer on both sides of the lower boom point in
place of the sheave clusters.
9. Install an equal thickness of shims on both ends of both
spacers to limit the side play to 0.762 mm (0.030 in).
10. Install a bolt with flat washers and securely tighten the
elastic stop nut.
Installing Outer Two Sheave Clusters
See Figure 4-50 for the following procedure.
Perform the following steps to install the outer two sheave
clusters:
• Prior to installing the boom top when assembling the
boom
• After shortening the boom to a length that allows
use of the outer two sheave clusters
1. Position the boom top or boom so the center rope guard
is just touching the ground.
2. Remove the elastic stop nut and bolt.
3. Remove the spacer and shims from both sides of the
lower boom point and store the spacer and shims.
4. Install an outer sheave cluster in the saddles on both
sides of the lower boom point.
5. Install an equal thickness of shims on both ends of both
sheave clusters to limit the side play to 0.762 mm
(0.030 in).
6. Install a bolt with flat washers and securely tighten the
elastic stop nut.
7. Assemble a rope guard over both sheave clusters.
8. Securely fasten rope guards to the boom top with
screws, lockwashers, and nuts provided.
Greasing Sheave Bearings
Carefully hand pack each sheave bearing with N.G.L.I. EP
#2 grease at assembly.
Make sure to also fill cavities between the bearing and seals
with grease.
Adjusting Bearing End Play
See Figure 4-50 for the following procedure.
Perform the following steps when assembling a sheave
cluster.
1. Assemble three sheave assemblies to the shaft.
2. Clean the threads of the shaft and spanner nut with
solvent.
3. Apply Loctite TL277 or equivalent thread-locking
adhesive to the threads of the shaft.
4. Install a spanner nut and tighten to 68 to 136 Nm (50 to
100 ft-lb) to remove all bearing end play on the shaft.
WARNING
Tipping Crane Hazard!
Prevent possible injury. The rear of the crane will tip
forward when the boom is raised if the following step is
not performed.
Do not attempt to raise the boom until the outer two
sheave clusters have been removed. Refer to the boom
lengths specified on Capacity Chart.
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