Manitowoc 2250 Service And Maintenance Manual

Reference Only
INTRODUCTION 2250 SERVICE/MAINTENANCE MANUAL
1-64
Published 11-06-15, Control # 040-13
Lower Accessory System Components
General
Lower accessory system components include boom hinge
pin cylinders, boom handling cylinders, rigging winch motor,
and crawler pin cylinders. During normal operation the lower
accessory solenoid valves are “motor spooled” where both
cylinder ports and tank port of valve spool section are
connected in center position and open to tank.
The auxiliary pump is the hydraulic pressure source to
operate the upper and lower accessory system components.
Hydraulic fluid from auxiliary pump flows through auxiliary
system disable relief valve HS-12. Hydraulic fluid enters
upper accessory valve and flows through variable output
control valve HS-20 and hydraulic quick disconnect to the
lower accessory valve.
The auxiliary system disable relief valve HS-12 is controlled
by the PC. During normal operation the relief valve is open
and excess supply flow from auxiliary pump is dumped
through valve to tank. When a component of either
accessory system is enable, an input signal is sent to the PC.
The PC sends a 12 volt output signal to auxiliary system
enable relief that adjust system pressure to 3,500 psi (241
bar).
When a lower accessory system switch is enabled the PC
sends a variable 0 to 12 volt output signal to variable output
control valve HS-20. The variable control valve output is
adjustable from 0 to 15 GPM (57 L/min) with speed control
rotary switch on setup remote control.
Boom Hinge Pins
See Figure 1-37 and Figure 1-38 for the following procedure.
Boom hinge pins cannot be disengaged until cylinder lock
cover is open, on front of rotating bed.
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.
Boom Hinge Pins Engage
When the power button is pressed and the boom hinge pins
switch is held down in the engage position, an input signal is
sent to the PC. The PC sends a 12 volt output signal to
auxiliary system disable relief valve HS-12 that adjust
system pressure to 3,500 psi (241 bar).
Boom hinge pins engage solenoid HS-10 is enabled by the
PC to shift the solenoid valve in the engage position.
Hydraulic fluid enters upper accessory valve and flows
through variable output control valve HS-20 and hydraulic
quick disconnect assembly to the lower accessory valve.
Hydraulic fluid exits the valve assembly and flows to piston
end of hinge pin cylinders, engaging the pins to connect the
boom to adapter frame. Fluid from rod end of cylinders flows
through valve assembly through hydraulic quick disconnect
and to tank.
When power button or boom hinge pins switch is released,
the PC sends a 0 volt output to shift spool of solenoid HS-10
to center position.
Boom Hinge Pins Disengage
When power button is pressed and boom hinge pins switch
is held in the up disengage position, an input signal is sent
to the PC. The PC sends a 12 volt output signal to auxiliary
system disable relief valve HS-12 that adjust system
pressure to 3,500 psi (241 bar).
Boom hinge pins engage solenoid HS-11 is enabled by the
PC to shift the boom hinge pin solenoid valve in the
disengage position. Hydraulic fluid enters upper accessory
valve and flows through variable output control valve HS-20
and hydraulic quick disconnect assembly to the lower
accessory valve.
Hydraulic fluid exits the valve assembly and flows to rod end
of hinge pin cylinders, disengaging the pins from boom and
adapter frame. Fluid from piston end of cylinders flows
through valve assembly through hydraulic quick disconnect
and to tank.
When power button or boom hinge pins switch is released,
the PC sends a 0 volt output to shift spool of solenoid HS-10
to center position.

Manitowoc 2250 Specifications

General

Brand	Manitowoc
Model	2250
Category	Construction Equipment
Language	English