Manitowoc 2250 Service And Maintenance Manual

Reference Only
HOISTS 2250 SERVICE/MAINTENANCE MANUAL
5-14
Published 11-06-15, Control # 040-13
5. With air still applied to actuator, perform removal step 6
to cage power spring in actuator.
NOTE: For independent drum drive, with air still applied to
actuator, cage power spring in actuator with a 3/4
in. (19 mm) deep-socket wrench, turn release bolt
counter-clockwise 22 to 23 turns.
6. Turn off and exhaust air from actuator.
Rework – Past Production Actuators
See Figure 5-10 for the following procedure.
Before installing a new or rebuilt actuator, rework it according
to the following steps:
1. Remove jam nut from piston rod.
2. Install brake release bolt and washer hand tight and then
torque bolt to 20 to 25 ft-lb (27 to 34 N•m).
3. Apply at least 90 psi (6,2 bar) air pressure to spring
brake port of actuator.
4. Cut off piston rod at dimension given in Figure 5-10
for
past production actuators.
5. With air still applied to actuator, perform removal step 6
to cage power spring in actuator.
NOTE: For independent drum drive, with air still applied to
actuator, cage power spring in actuator as follows:
• Unsnap dust cap from top of actuator.
• Turn release bolt counterclockwise until bolt
and washer are removed.
6. Turn off and exhaust air from actuator.
Installation
See Figure 5-7 for the following procedure.
1. Perform rework steps.
2. Install jam nut and rod end on piston rod as shown in
Figure 5-7
, View C. End of piston rod must be flush
with inside of rod end. Tighten jam nut against rod end.
3. Connect quick-release valve to spring brake port of
actuator.
4. Attach actuator to support with mounting plate, two flat
washers, and two nuts; tighten nuts to 133 to 155 ft-lb
(180 to 210 N•m).
5. Connect air lines to proper ports of actuator
(Figure 5-10
):
a. Air line from working brake treadle valve to service
brake port (outboard actuator only).
Inboard actuator has a nut bushing and breather
installed in place of air line.
b. Air line from parking brake control valve to spring
brake port (port with quick-release valve).
6. Pin rod end to brake lever.
7. Stand clear of actuator. turn off drum park to release
parking brake for drum being serviced.
8. Un-cage power spring in actuator, as follows:
Current Production:
a. Using a 3/4 in (19 mm) deep-socket wrench, turn
release bolt clockwise until tight and torque to 74 ft-
lb (100 N•m).
Past Production:
a. Unsnap dust cap from top of actuator.
b. Install brake release bolt and washer (Figure 5-7,
View B) hand tight and then torque bolt to 20 to 25
ft-lb (27 to 34 N•m).
9. Turn on drum park to apply parking brake for drum being
serviced.
10. Check brake for proper operation and adjustment.
Brake Release Adjustment
Perform following adjustment only if a new or rebuilt actuator
or regulator has been installed or if a new lining or band has
been installed.
NOTE: Corresponding drum brake must be properly
adjusted before performing brake release
adjustment.
1. Read precautionary steps given after heading.
2. Lower load block, weight ball, or bucket to ground from
drum being serviced so wire rope is slack

Manitowoc 2250 Specifications

General

Brand	Manitowoc
Model	2250
Category	Construction Equipment
Language	English