Manitowoc 2250 Service Maintenance Manual

Reference Only
Manitowoc Published 07-19-16, Control # 249-01 1-63
2250 SERVICE/MAINTENANCE MANUAL INTRODUCTION
1
Boom Butt Handling Cylinder
See Figure 1-36 and Figure 1-38 for the following.
With the engine running, power is available to the setup
remote control when the cable is connected at the air valve
junction box on the left side of the rotating bed.
Boom Butt Handling Cylinder Extend
When the power button is pressed and the boom butt
cylinder switch is held in the UP (extend) position, an input
signal is sent 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 boom butt handling cylinder extend solenoid HS-15 is
enabled by the PC to shift the solenoid valve in the extend
position. Hydraulic fluid enters the upper accessory valve
and flows through the variable output control valve HS-20
and hydraulic quick disconnect to the lower accessory valve.
Hydraulic fluid exits the valve assembly and flows through
the free-flow check valve section of the counterbalance
valve. Hydraulic fluid then enters the piston end of the boom
butt handling cylinder, extending the cylinder to raise the
boom butt.
Fluid from the rod end of the cylinder is blocked by the
opposite side free-flow check valve section of the
counterbalance valve and flows through the flow-restraining
section with a relief setting of 207 bar (3,000 psi). The
counterbalance valve acts as a deceleration control with a
3:1 pilot ratio. Hydraulic fluid flows through the boom butt
handling cylinder valve to the tank through the hydraulic
quick disconnect.
Boom Hinge Pins Engage
M104188
Auxiliary Pump
Fan Pump
To F a n
Circuit
Upper Accessory Valve
HS-11
HS-10
Lower Accessory Valve
x
Boom Hinge Pins Disengage
M104189
Suction
Manifold
Auxiliary Pump
Fan Pump
To F a n
Circuit
Upper Accessory Valve
HS-11
HS-10
Lower Accessory Valve
x
Variable Output Valve
Variable Output Valve
0 to 57 L/min (0 to15 gpm)
Suction
Manifold
FIGURE 1-37
0 to 57 L/min (0 to15 gpm)
Valve
Disable-Relief
Auxiliary System
Valve
Disable-Relief
Auxiliary System
HS12
HS12

Manitowoc 2250 Specifications

General

Brand	Manitowoc
Model	2250
Category	Construction Equipment
Language	English