Manitowoc 2250 Service Maintenance Manual

Reference Only
INTRODUCTION 2250 SERVICE/MAINTENANCE MANUAL
1-78
Published 07-19-16, Control # 249-01
Backhitch Pins
See Figure 1-48 for the following.
The backhitch pins are retracted from the telescopic
backhitch strap during assembly or disassembly. With the
engine running, power is available to the mast backhitch pins
remote switch when the power cable (W29) is plugged into
the receptacle at the bottom of the main junction box on the
left side of the crane. The mast backhitch pins remote switch
is operative only if the crane is in Standard or Setup mode.
Backhitch Pins Extend/Retract
Each backhitch pin cylinder is spring-returned to the
extended position. In this position, the backhitch pins
normally closed air solenoid AS-1 is disabled and normally
opened air solenoid AS-2 is also disabled. This allows air
flow from the manifold through AS-1 to the piston end of the
pin cylinders. When the power ON button and retract OUT
buttons are pressed and held, the backhitch pins air
solenoids AS-2 and AS-1 are both enabled to retract the
backhitch pins. Air then flows through solenoid AS-2 to the
rod end of the backhitch pin cylinders. The backhitch pin
cylinders then retract to move the pins out of engagement,
while air from the piston end of the cylinders exhausts to the
atmosphere through the air solenoid AS-1.
8K
60M
N/O
N/C
0
AS-2
AS-1
15 Amp
CB
5A
8K
RM-04
Mast Backhitch
Pin Cylinder
AS-2
AS-1
Mast Backhitch
Pin Cylinder
Mast Backhitch
Pin Disengage
Mast Backhitch
Pin Engage
P
E
A
A
E
P
From Main
Air Manifold
Manifold
Manifold
Mast Backhitch Pins Remote
To MAX-ER Remote
P
R
Electrical Circuit
Air System
RM-03
FIGURE 1-48

Manitowoc 2250 Specifications

General

Brand	Manitowoc
Model	2250
Category	Construction Equipment
Language	English