Manitowoc 2250 Service Maintenance Manual

Reference Only
Manitowoc Published 07-19-16, Control # 249-01 1-57
2250 SERVICE/MAINTENANCE MANUAL INTRODUCTION
1
Adapter Frame Pin Cylinders
See Figure 1-32 and Figure 1-34 for the following.
The operating description is for the front adapter frame
connecting pins. Operation of the rear pins is the same,
except different switches are used.
With the engine running, power is available to the jacking
remote control when the cable is connected at the auxiliary
valve junction box on the right side of the rotating bed.
Adapter Frame Pins Engage
When the power button is pressed and the front adapter
frame pin switch is held in the UP (engage) position, an input
voltage is sent through a diode to the PC. The PC sends a
12 V output signal to the auxiliary system’s disable-relief
valve HS-12 that adjusts system pressure to 276 bar
(4,000 psi).
The PC also sends a 12 V output signal to enable the front
adapter frame pins engage solenoid HS-21. Hydraulic pilot
pressure at 24 bar (350 psi) or 21 bar (300 psi) shifts the
valve in the selected direction.
Hydraulic fluid exits the valve sections of the upper
accessory valve and flows to the front left and right frame
connecting pin cylinders piston end, extending the pins to
connect the front of the rotating bed with the adapter frame.
Fluid from the rod end of the pin cylinders flows back through
the upper accessory valve to the tank.
When the power button or front adapter frame pins switch is
moved to the OFF position, the PC sends a 0 V output to
shift the spool of solenoid valve HS-21 to the center position.
Adapter Frame Pins Disengage
When the power button is pressed and the front adapter
frame pin switch is held in the DOWN (disengage) position,
an input voltage is sent through a diode to the PC. The PC
sends a 12 V output signal to the auxiliary system’s disable-
relief valve HS-12 that adjusts system pressure to 276 bar
(4,000 psi).
The PC also sends a 12 V output signal to enable the front
adapter frame pins disengage solenoid HS-22. Hydraulic
pilot pressure at 24 bar (350 psi) or 21 bar (300 psi) shifts
the valve in the selected direction.
Hydraulic fluid exits the valve sections of the upper
accessory valve and flows to the front left and right frame pin
cylinders’ rod ends, retracting the pins to disconnect the front
of the rotating bed with the adapter frame. Fluid from the
piston end of the pin cylinders flows back through the upper
accessory valve to the tank.
When the power button or front adapter frame pins switch is
moved to the OFF position, the PC sends a 0 V output to
shift the spool of solenoid valve HS-22 to the center position.

Manitowoc 2250 Specifications

General

Brand	Manitowoc
Model	2250
Category	Construction Equipment
Language	English