Manitowoc 2250 Service Maintenance Manual

Reference Only
Manitowoc Published 07-19-16, Control # 249-01 2-37
2250 SERVICE/MAINTENANCE MANUAL HYDRAULIC AND AIR SYSTEMS
2
Adjustment
See Figure 2-41 for the following procedure.
1. Shut down the crane.
2. Discharge the system air pressure.
3. Disconnect the crane source air line piping at the
pressure switch that needs adjustment.
4. Remove the cover screw (4 or 9) and pressure switch
cover (8).
5. Connect a calibrated pressure source with a gauge to
the 1/4” NPT fitting on the air sensor inlet, ensuring there
are no air leaks.
6. Connect one lead of the tester to either the normally
closed (N/C) terminal or the normally open (N/O)
terminal of the limit switch, depending on the circuit
application. Ground the other lead of the tester.
7. Connect the DC voltage power supply to the common
(COM) terminal of the limit switch.
8. If the pressure switch is wired N/C, proceed as follows.
a. Turn the switch adjustment screw (5) all the way in
and then out until it just touches the plunger.
b. Increase air pressure to the specified point. The
tester light should go off.
c. Turn the switch adjustment screw in until the tester
light comes on.
9. If the pressure switch is wired N/O, proceed as follows.
a. Turn the switch adjustment screw all the way in.
b. Increase air pressure to the specified point.
c. Turn the switch adjustment screw out until the tester
light comes on.
10. Always recheck set points after adjustments are made.
11. Disconnect the DC voltage power supply, calibrated air
supply, and tester.
12. Reinstall the air pressure switch.
13. Start the crane and allow the system to reach operating
pressure. Activate the corresponding circuit to test and
confirm the pressure switch trip point.
4
3
P2487_1
673356
Item Description
1 Drum 3 (left rear) Pressure
Switch
2 Drum 2 (rear/right rear)
Pressure Switch
3 Drum 1 (front) Pressure Switch
(not shown)
4 Cover Screw (typical)
5 Switch Adjustment Screw
Left Side of Crane
1
FIGURE 2-41
IMG_6844
Item Description
6 Has No Function
7 Has No Function
8 Pressure Switch Cover
9 Cover Screw (typical)
10 Low System Air Pressure
Safety Switch
Left Side of Crane Under Cab
6
7
9
8
10
2
5

Manitowoc 2250 Specifications

General

Brand	Manitowoc
Model	2250
Category	Construction Equipment
Language	English