Manitowoc 2250 Service And Maintenance Manual

Reference Only
Manitowoc Published 11-06-15, Control # 040-13 1-49
2250 SERVICE/MAINTENANCE MANUAL INTRODUCTION
1
solenoid AS-9. The valve is enabled and shifts to allow
manifold air pressure to release spring applied brake.
Pump EDC continues to tilt swashplate in the up direction as
hydraulic fluid flow is from pump outlet port to motor inlet
port. Fluid then flows from pump ports A to motor port A.
Fluid from motor port B returns to load drum pump ports B.
The PC output voltage to pump EDC’s and the motor PCP is
relative to control handle movement. As control handle is
moved back, pump swashplate angle is increased. When
system pressure exceeds the PCOR (Pressure
Compensating Over-Ride) valve setting of 4,930 psi (340
bar), the valve shifts to direct flow from shuttle valve into
maximum displacement side of servo cylinder. The PCOR
valve over-rides the command from servo PC valve,
increasing motor displacement and output torque and
reducing output speed. When PCOR valve closes, control of
the motor returns to servo PC valve.
The PC is continuously balancing the system pressure and
the motor displacement angle so the motor displacement
goes to minimum when control handle is fully back, if the
motor torque is not too high. The PC monitors motor
displacement and controls motor speed by regulating the
hydraulic fluid flow through the pumps.
RF-20
50 AMP
8P1
10 VDC REGULATED SUPPLY
WA-03
WA-01
LEFT (DRUM 1) CONTROL HANDLE
K1
8
RAISE
5A
F16
3A
LOWER
F11
5A
8E
CRANE DISPLAY
WD-19
WD-20
WC-05
MAIN PUMP CONTROL 1
EDC
B
A
0
GND
MAIN CHARGE
PRESSURE
SENDER
WA-25
WA-22
WE-04
WE-03
8E
0
AS
19
87FA
DRUM 2 PAWL IN
WE-36
WA-04RIGHT (DRUM 2/3) CONTROL HANDLE
RAISE
LOWER
MAIN HOIST
PRESSURE
SENDER
RIGHT REAR
SPEED
SENDER
F
A
B
D
(DRUM 2)
MINIMUM BAIL LIMIT (DRUM 2)
WB-08
MAXIMUM BAIL LIMIT (DRUM 2)
WB-07
WC-06
MAIN PUMP CONTROL 2
EDC
BA
WD-25
MAIN HOIST MOTOR CONTROL
PCP
B
A
WC-26
LEFT ROTATION INDICATOR
AS
20
DRUM 2 PAWL OUT
WE-37
F10
8D
AS
9
WB-27
WC-08
DRUM 2 BRAKE
RIGHT HANDLE DRUM 2 LIGHT
WC-11
F12
5A
8E
WB-22LEFT REAR DRUM
WD-20
LOW AIR PRESSURE
HAS NO FUNCTION
WD-36
AMBER
WC-20
OPT. MAIN PUMP CONTROL
B
A
WC-29
C
D
P/C
GREEN
WD-34
OPT. MAIN MOTOR CONTROL
PCP
BA
AS
10
DRUM 2 CLUTCH
WC-17
AS
8
DRUM 1 CLUTCH
WC-16
AS
12
DRUM 3 CLUTCH
WC-18
CONTROLLER
PROGRAMMABLE
5A
SEAT SWITCH
WB-10
WC-33
RIGHT ROTATION INDICATOR
FIGURE 1-28

Manitowoc 2250 Specifications

General

Brand	Manitowoc
Model	2250
Category	Construction Equipment
Language	English