Manitowoc 2250 Service And Maintenance Manual

Reference Only
Manitowoc Published 11-06-15, Control # 040-13 1-71
2250 SERVICE/MAINTENANCE MANUAL INTRODUCTION
1
Air System Components
Counterweight/Back Hitch Pins
See Figure 1-37 and Figure 1-42 for the following procedure.
Power is available to setup remote control when the cable is
connected at air valve junction box on left side of rotating bed
and engine is running.
Counterweight/Back Hitch Pins Extend
When power button is pressed, power is enabled to operate
counterweight upper pins switch, counterweight lower pins
switch, or back hitch pins switch.
Each pin switch is spring-returned to extend position. In this
position, counterweight upper pins extend normally closed
solenoid AS-5, counterweight lower pins extend normally
closed solenoid AS-3, or back hitch pins extend normally
closed solenoid AS-1, are enabled. Air flows through the
normally closed solenoid to piston end of pin cylinder.
Cylinders move the pins into engagement while air from rod
end of cylinder exhausts to atmosphere.
Counterweight/Back Hitch Pins Retract
When power button is pressed and the counterweight upper
pins switch is held in the up retract position, an input signal
is sent to the PC. The PC sends a 0 volt output signal to
disable counterweight upper pins normally closed solenoid
AS-5 and a 12 volt output signal to enable counterweight
upper pins normally open solenoid AS-6. Air then flows
through the normally open solenoid to rod end of
counterweight upper pin cylinders. the cylinders then retract
to move pins out of engagement while air from piston end of
cylinder exhausts to atmosphere.
When power button or selected pin switch is released, the
PC sends a 0 volt output signal to disable counterweight
upper pins normally open solenoid AS-6 and a 12 volt output
signal to enable counterweight upper pins normally closed
solenoid AS-5.
RF-41
MAIN AIR MANIFOLD
BACK HITCH
BACK HITCH
PIN CYLINDER
AS-2
AS-1
PIN CYLINDERS
P
P
E
A
E
A
EXTEND
BACK HITCH
PIN CYLINDER
RETRACT
AIR MANIFOLD
RF-42
MAIN AIR MANIFOLD
PIN CYLINDER
AS-6
AS-5
PIN CYLINDERS
P
P
E
A
E
A
EXTEND
COUNTERWEIGHT
PIN CYLINDER
RETRACT
AIR MANIFOLD
BACK HITCH PIN CYLINDERS EXTEND
COUNTERWEIGHT UPPER PINS RETRACT
UPPER
COUNTERWEIGHT
UPPER
COUNTERWEIGHT
UPPER
FIGURE 1-42

Manitowoc 2250 Specifications

General

Brand	Manitowoc
Model	2250
Category	Construction Equipment
Language	English