Manitowoc 2250 Service And Maintenance Manual

Reference Only
Manitowoc Published 11-06-15, Control # 040-13 1-43
2250 SERVICE/MAINTENANCE MANUAL INTRODUCTION
1
When a travel control handle is moved in reverse direction,
an input voltage of 5 volts or less is sent to the PC. The PC
sends a variable plus 0 to 2.8 volt output that is applied to
selected travel pump EDC. The PC sends a 12 volt output to
enable travel brake solenoid valve HS-1. Travel brake
solenoid valve is enabled to release both left and right
crawler brakes, before selected travel pump(s) strokes.
The travel pump EDC tilts the motor swashplate in the
reverse direction. Hydraulic fluid flow is from pump port of
selected travel pump through swivel to motor port. The PC
sends an input voltage to selected travel pump EDC that is
relative to selected control handle movement.
Travel motors are variable displacement and shift internally
with an adjustable spring in each motor P/C (Pressure/
Compensator) valve, preset at 3,915 psi (270 bar). Travel
motors are in minimum displacement (low torque, high-
speed) position when starting. When crawler begins to
move, a high system pressure shifts the PCOR (Pressure
Compensated Over-Ride) spool placing travel motor in
maximum displacement (high torque, low speed) position for
breakaway torque.
As travel control handle nears neutral position, the PC
compensates for hydraulic system leakage or changing
engine speed. The PC sends a 0 volt output to pump EDC to
move swashplate to center position. After travel control
handle command is off for a preset time, a 0 volt output is
sent to disable travel brake solenoid valve HS-1. Travel
brake solenoid valve shifts to block pilot pressure to brakes
and opens a line to tank. Brakes apply.
RF-15
50 AMP
8P1
87FA 10 VDC REGULATED SUPPLY
WA-07
WA-01
CONTROL HANDLE
K1
8
REVERSE
5A
F16
3A
FORWARD
F12
5A
8T
F10
5A
8D
CRANE DISPLAY
WD-19
WD-20
WC-23
LEFT TRAVEL PUMP
EDC
B
A
0
GND
LEFT TRAVEL
PRESSURE
SENDER
RIGHT TRAVEL
PRESSURE
SENDER
WA-28
WA-27
SWING/TRAVEL ALARM
WD-35
HIGH SPEED TRAVEL SWITCH
WA-06CONTROL HANDLE
REVERSE
FORWARD
LEFT TRAVEL
RIGHT TRAVEL
WC-15
RIGHT TRAVEL PUMP
EDC
B
A
WB-01
TRAVEL DETENT
WB-15
HS
35
HS
1
TWO-SPEED TRAVEL
WC-32
WB-19
WC-10
TRAVEL BRAKE
PROGRAMMABLE
CONTROLLER
FIGURE 1-23

Manitowoc 2250 Specifications

General

Brand	Manitowoc
Model	2250
Category	Construction Equipment
Language	English