Manitowoc 2250 Service Maintenance Manual

Reference Only
Manitowoc Published 07-19-16, Control # 249-01 5-7
2250 SERVICE/MAINTENANCE MANUAL HOISTS
5
Reconnect the electrical cord to the proper block-up limit
switch when the corresponding attachment is reinstalled.
Maintenance
Inspect and test the block-up limit control weekly or every 40
hours of operation as follows.
NOTE: Do not operate the crane until cause for improper
operation and all hazardous conditions have been
found and corrected.
1. Lower the boom onto blocking at ground level and
carefully inspect the following items:
- Inspect each limit switch lever and actuating lever
for freedom of movement. Apply a one-half shot of
grease to the fitting on the actuating lever. Wipe
away any excess grease.
- Inspect each weight for freedom of movement on
the load line.
- Inspect each weight, chain, shackle and connecting
pin for excessive or abnormal wear. Make sure the
cotter pins for the shackles are installed and spread.
- Inspect the entire length of the electrical cords for
damage.
- Make sure the electrical cords are clear of all
moving parts and that the cords are securely
fastened to the boom and jib with metal straps.
- Verify that all plugs are securely fastened.
2. Test the block-up limit control for proper operation using
either of the following methods:
- Boom lowered—Manually lift each weight, one at a
time, with the engine running. The load drum should
not operate in the HOIST direction, and the boom
hoist should not operate in the LOWER direction.
- Boom raised—Slowly hoist each load block and
weight ball, one at a time, against the weight. When
the chain goes slack, the corresponding load drum
should stop hoisting and the boom hoist should not
operate in the LOWER direction.
Adjustment
See Figure 5-5 for the following procedure.
Lower the boom onto blocking at ground level and adjust
each limit switch as follows.
1. Adjust the spring (3) tension so there is enough force to
lift the weight of the chain and rotate the actuating
lever (7) when the weight is lifted.
2. Loosen the set screw (4) in the limit switch lever (9) so
the lever is free to rotate.
3. Manually lift the weight to allow the actuating lever to
rotate upward.
4. Hold the lever at Dimension A.
5. Hold the roller (8) on the limit switch lever against the
actuating lever while performing step 6
.
6. Turn the limit switch shaft (10) clockwise only enough for
the limit switch to click open and hold it. Then securely
tighten the set screw in the limit switch lever.
7. Test the limit switch for proper operation (see
Maintenance
). Repeat the adjustment steps until the
limit switch operates properly.
WARNING
Two Blocking Hazard!
Two blocking can result in failure of sheaves and wire
rope, possibly causing the load to fall, resulting in death or
serious injury.
If the block-up limit control fails to stop the load,
immediately stop the load by moving the drum control
handle to the OFF position or by applying the drum
working brake to prevent two blocking.
Item Description
1Enclosure
2 Elbow with Cord Gripper
3Spring
4Set Screw
5 Adjusting Screw (spring tension)
6 Grease Fitting
7 Actuating Lever
8Roller
9 Limit Switch Lever
10 Limit Switch Shaft
11 Cover
FIGURE 5-5
A1050
1
2
3
4
5
6
7
8
9
10
11
Dimension A
26 mm (1.04 in)

Manitowoc 2250 Specifications

General

Brand	Manitowoc
Model	2250
Category	Construction Equipment
Language	English