Manitowoc 2250 Service Maintenance Manual

Reference Only
INTRODUCTION 2250 SERVICE/MAINTENANCE MANUAL
1-86
Published 07-19-16, Control # 249-01
Steering Arm Cylinders
See Figure 1-55 and Figure 1-56 for the following.
Steering arms and stop pins must be properly positioned
depending on the swing radius and type of crawler travel or
swing. See Section 4 of Operator Manual for information on
positioning 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 switch. The switch is spring-returned
to the OFF position.
Steering Cylinders Extend (Swing/Crab)
The steering pins must be disengaged first, before the
steering arms can be positioned. Move the stop pins to the
desired steering position. When the steering switch is held in
the UP (swing/crab) position, an input signal is sent to the
programmable controller (PC). A 12 V output signal from the
PC enables the steering solenoid valve HS-42 to extend the
right side and left side steering arm cylinders. Internal pilot
supply pressure of 14 bar (200 psi) enables the selected
spool to shift the steering arm extend 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. An inline relief valve set at
83 bar (1,200 psi) reduces the auxiliary system’s pressure to
the steering arm cylinders.
Accessory system fluid enters the MAX-ER’s accessory
valve and goes through the steering solenoid valve to the
piston end of the steering arm cylinders to extend the
cylinders and move the steering arms to the swing or crab
position.
Return fluid from the rod end of the steering arm cylinders
passes through the MAX-ER’s accessory valve before
returning to the crane’s hydraulic tank through the return line.
Release the steering switch to stop extending the steering
arms when the stop is reached. When the steering arms are
positioned, the steering pins must be engaged.
CAUTION
Machinery Damage!
The wheeled counterweight assembly must be supported
on jacks before changing the wheel position.
Make sure that the strut and draw bar pins are in the
proper positions. Hydraulic cylinders and other wheeled
counterweight trailer components may be damaged.
Extend the jacks to support most of the counterweight
trailer’s load until bulge is out of the tires. Failure to do so
may cause the tires to separate from the rims as the
wheels are positioned.
56MB
56MA
90L
90k
Power
HS
43
HS
52
HS
53
HS
41
HS
40
89J4
89K4
0
15 Amp
CB
5A
8K
RM-11
MAX-ER 2000 Remote
12
HS
HS
42
FIGURE 1-55
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