Manitowoc 2250 Service Maintenance Manual

Reference Only
Manitowoc Published 07-19-16, Control # 249-01 5-13
2250 SERVICE/MAINTENANCE MANUAL HOISTS
5
Removal
See Figure 5-8 for the following procedure.
1. Lower the load block, weight ball, or bucket to the
ground so the wire rope is slack on the drum being
serviced.
2. If equipped with three drums, use the drum selector to
select the desired rear drum, right or left.
3. Fully release the drum working brake (brake pedal up
fully).
4. Turn on Free Fall and turn off the drum park for the drum
being serviced. The drum park brake will release.
5. Using an appropriate wrench, turn the release bolt
counterclockwise 22 to 23 turns to cage the power
spring in the brake actuator (9).
6. Stand clear of the actuator. Turn on the drum park for the
drum being serviced. The park brake will spring apply.
The piston rod (14) may extend slightly when this step is
performed.
7. Tag the air lines for proper identification when
reinstalling the actuator.
8. Disconnect the air lines from the actuator.
9. Remove the rod end pin (16) to disconnect the rod
end (17) from the brake lever (12).
10. Remove the mounting nuts (11) and remove the actuator
from the mounting bracket (10). The actuator weighs
approximately 14 kg (30 lb).
Repair
Follow the instructions in the manufacturer’s service manual
to properly repair the actuator.
Rework
See Figure 5-10 for the following procedure.
Before installing a new or rebuilt actuator, rework it according
to the following steps.
1. Remove the jam nut from the piston rod end.
2. Turn the spring brake release bolt clockwise until tight
and tighten it to 100 Nm (74 lb-ft).
3. Apply at least 6,2 bar (90 psi) of air pressure to the
spring brake port of the actuator.
4. As shown, cut off the piston rod at 48 mm (1-7/8 in) for
standard actuators and 38 mm (1-1/2 in) for clamshell
drum actuators.
5. With air still applied to the actuator, perform step 5
under
Removal
to cage the power spring in the actuator.
6. Exhaust the air from the actuator.
Installation
See Figure 5-8 for the following procedure.
1. Rework the actuator. See Rework
.
2. Install the jam nut (15) and rod end (17) on the piston
rod (14) (see View B). The end of the piston rod must be
flush with the inside of the rod end. Tighten the jam nut
against the rod end.
3. Connect a quick-release valve to the spring brake port of
the brake actuator (9).
4. Attach the actuator to the mounting bracket (10) with the
two flat washers and two mounting nuts (11). Tighten the
nuts to 180 to 210 Nm (133 to 155 lb-ft).
See Figure 5-10
for the remaining steps.
5. Connect the air lines to the proper ports of the actuator
as follows.
a. Connect the air line from the working brake treadle
valve to the service brake port.
The inboard actuator has a nut bushing and
breather installed in place of the air line.
b. Connect the air line from the park brake control
valve to the spring brake port.
6. Pin the rod end to the brake lever.
7. Stand clear of the actuator and turn off the drum park to
release the park brake for the drum being serviced.
8. Using an appropriate wrench, turn the release bolt
clockwise until tight to uncage the power spring in the
actuator. Tighten the release bolt to 100 Nm (74 lb-ft).
9. Turn on the drum park to apply the park brake for the
drum being serviced.
10. Check the brake for proper operation and adjustment.
FIGURE 5-10
48 mm (1-7/8 in)
(split rear)
A467
Cut Off Excess
Piston Rod
Spring Brake Port
(park brake)
Service Brake Port
(working brake)
38 mm (1-1/2 in)
(full front/rear)
NOTE: The mounting studs
are removed for clarity.

Manitowoc 2250 Specifications

General

Brand	Manitowoc
Model	2250
Category	Construction Equipment
Language	English