Manitowoc 2250 - Page 70

Reference Only
INTRODUCTION 2250 SERVICE/MAINTENANCE MANUAL
1-54
Published 07-19-16, Control # 249-01
pressure. This allows the valves to open when the pressure
in the rod end of the cylinders is approximately 69 bar
(1,000 psi).
The restraining section of the counterbalance valves open,
controlling fluid flow out of the jacking cylinders. Fluid then
exits the counterbalance valves and flows out of the upper
accessory valve before returning to the tank through the
return manifold. If more power is needed to extend the jacks,
engine speed can be increased with the remote engine
speed switch in the remote start junction box on the right side
of the rotating bed.
When the power button or jacking switch is moved to the
OFF position, the PC sends a 0 V output to shift the spool of
solenoid valves HS-25 and HS-27 to the center position.
RF-25
50 Amp
8P1
K1
8
5A
F13
15A
8SR
Crane Display
WD-19
WD-20
Front Adapter Frame Pins Engage
0
Ground
Controller
Programmable
Power
Left Front Jack Extend
Controller
Programmable
Front Adapter Frame Pins Disengage
Rear Adapter Frame Pins Engage
Rear Adapter Frame Pins Disengage
Left Front Jack Retract
Right Front Jack Extend
Right Front Jack Retract
Left Rear Jack Extend
Left Rear Jack Retract
Right Rear Jack Extend
Right Rear Jack Retract
HS
24
HS
26
HS
29
HS
31
HS
32
Ringer Jacks Power
HS
22
HS
23
HS
28
HS
30
Level Alarm
R
10 V Regulated Supply
WA-01
F16
3A
87FA
Level Sensor X
0
Level Sensor X
0
WC-36
WB-11
WA-20
WA-33
HS
21
HS
25
HS
27
WC-27
HS
12
Auxiliary System Disable-Relief Valve
FIGURE 1-32