Manitowoc 2250 Service Maintenance Manual

Reference Only
HOISTS 2250 SERVICE/MAINTENANCE MANUAL
5-26
Published 07-19-16, Control # 249-01
ADJUSTING THE DRUM PAWL
General
This section applies only to the ratchet and pawl provided on
the 1,9 m (73 in) wide front and rear drums.
The pawl limit switches must be properly adjusted to ensure
proper operation of the drums.
When either pawl is engaged, the corresponding limit switch
closes the electrical circuit to the crane’s programmable
controller. This action prevents the corresponding drum from
being operated in the LOWER direction.
When either pawl is disengaged, the corresponding limit
switch opens the electrical circuit to the programmable
controller. This action allows the corresponding drum to be
operated in the LOWER direction.
If the operator attempts to operate either drum in the
LOWER direction with the corresponding pawl engaged, the
operating limit alert comes on and PAWL IN appears on the
digital display.
The pawl limit switches are factory set and do not require
periodic adjustment. Either limit switch must be adjusted if
parts are replaced and checked if the corresponding drum is
not operating properly.
Adjusting the Limit Switch
See Figure 5-24 for the following procedure.
1. Loosen the screw (4) so the lever (3) is free to rotate on
the shaft (5).
2. Disengage the corresponding pawl (1). It may be
necessary to hoist slightly before the pawl disengages
the ratchet (6).
3. Rotate the lever and hold it so the roller (2) is against the
pawl.
4. Turn the shaft, not the lever, counterclockwise until the
limit switch (7) clicks open, and hold the shaft.
5. Make sure the roller is against the pawl and securely
tighten the screw in the lever to lock the adjustment.
6. Check for proper operation as follows.
a. Engage the pawl and try to operate the drum. The
drum should not operate in the LOWER direction.
b. Disengage the pawl and try to operate the drum.
The drum should operate in the LOWER direction.
7. Readjust the limit switch if required.
Return Spring
See Figure 5-24 for the following procedure.
Adjust the eyebolt (12) so the return spring (13) has enough
tension to fully engage and hold the pawl (1) against the
ratchet (6).
CAUTION
Moving Machinery Hazard!
To make adjustments, the engine must be running and the
drum and pawl must be operated. This creates a condition
in which, if care is not exercised, minor injury or
equipment damage may occur.
Stay clear of the drum and pawl while either is being
operated. Maintain constant communication between the
operator and the adjuster so the drum and pawl are not
operated while the adjuster is in contact with parts.

Manitowoc 2250 Specifications

General

Brand	Manitowoc
Model	2250
Category	Construction Equipment
Language	English