Manitowoc 2250 Service Maintenance Manual

Reference Only
INTRODUCTION 2250 SERVICE/MAINTENANCE MANUAL
1-84
Published 07-19-16, Control # 249-01
Steering Pin Cylinders
See Figure 1-53 and Figure 1-54 for the following.
Steering pin cylinders disconnect the MAX-ER’s steering
arms from the counterweight trailer to allow positioning of the
steering wheels.
With the engine running, power is available to the MAX-ER’s
remote switch assembly when the power cable (W28) is
plugged into the receptacle on the left side of the
counterweight trailer. When the power button on the MAX-
ER’s remote switch assembly is pressed, power is enabled
to operate the steering pins switch. The switch is spring-
returned to the OFF position. In the OFF position, the
steering pin cylinders solenoid valve has a closed center with
both cylinder ports blocked.
Steering Pin Cylinders Disengage
When the steering pins switch is held in the UP (disengage)
position, an input signal is sent to the PC. A 12 V output
signal from the programmable controller (PC) enables the
steering pins disengage solenoid HS-53. Internal pilot supply
pressure of 14 bar (200 psi) enables the selected spool to
shift the steering pins solenoid valve. The crane’s PC sends
an output signal to shift the crane’s auxiliary system disable-
relief valve HS-12 to block the valve’s bypass. Accessory
system pressure increases to operate the accessory items.
Accessory system fluid enters the MAX-ER’s accessory
valve and flows to the rod end of the steering pin cylinders to
disengage the pins from the right side and left side steering
arms. Return fluid from the piston end of the cylinder passes
through the MAX-ER’s accessory valve before returning to
the crane’s hydraulic tank through the return line. Release
the steering pins switch to lock the steering pins in position.
RM-09
56MB
56MA
8K
90L
90K
Power
42
43
52
53
41
HS
40
CB
8K
89J4
89K4
0
15 Amp
5A
12
HS
HS
HS
HS
HS
HS
MAX-ER 2000 Remote
FIGURE 1-53
89H4
MAX-ER 2000
Programmable
Controller
Auxiliary System
Disable-Relief Valve
Crane
Programmable
Controller
88S
Swing/Crab (steering cylinder extend)
Steering Pins Extend
Steering Pins Retract
Counterweight Strap
Cylinder Extend
Counterweight Strap
Cylinder Retract
Swing/Crab (steering cylinder retract)

Manitowoc 2250 Specifications

General

Brand	Manitowoc
Model	2250
Category	Construction Equipment
Language	English