Manitowoc 2250 - Steering Cylinders Retract (Straight)

Reference Only
INTRODUCTION 2250 SERVICE/MAINTENANCE MANUAL
1-90
Published 11-06-15, Control # 040-13
Steering Cylinders Retract (Straight)
The steering pins must be disengaged first, before steering
arms can be positioned. Move the stop pins to desired
steering position. When steering switch is held in the DOWN
straight position, an input signal is sent to the PC. A 12-volt
output signal from PC enables the steering solenoid valve
HS-43 to retract right side and left side steering arm
cylinders. Internal pilot supply pressure of 200 psi (14 bar)
enables selected spool to shift the steering arm retract
solenoid valve.
The crane PC sends an output signal to shift crane auxiliary
system disable valve HS-12, to block valve bypass.
Accessory system pressure increases to operate accessory
items. An in line relief valve set at 1,200 psi (83 bar) reduces
the auxiliary system pressure to steering arm cylinders.
Accessory system fluid enters MAX-ER accessory valve and
goes through steering solenoid valve to the rod end of the
steering cylinders to retract steering cylinders and move
steering arms to straight position. Return fluid from piston
end of cylinders pass through MAX-ER accessory valve
before returning to crane hydraulic tank through return line.
Release steering switch to stop retracting steering arms
when stop is reached. When the steering arms are
positioned, the steering pins must be engaged.
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 1-56
89H4
MAX-ER 2000
PROGRAMMABLE
CONTROLLER
AUXILIARY SYSTEM
DISABLE 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