INTRODUCTION 2250 SERVICE/MAINTENANCE MANUAL
1-70
Published 11-06-15, Control # 040-13
Crawler Frame Pins Disengage
When power button is pressed and left crawler frame pins
switch is held in the up disengage position, an input signal is
sent to the PC. The PC sends a 12 volt output signal to
auxiliary system disable relief valve HS-12 that adjust
system pressure to 3,500 psi (241 bar).
The left crawler frame pins solenoid HS-3 is enabled by the
PC to shift the solenoid valve in the disengage position.
Hydraulic fluid exits the valve assembly and flows to rod end
of left crawler frame pin cylinders, disengaging the pins from
crawler frame. Fluid from piston end of cylinders flows
through valve assembly through hydraulic quick disconnect
and to tank.
When power button or left crawler frame pins switch is
released, the PC sends a 0 volt output to shift spool of
solenoid HS-3 to center position.
LEFT CRAWLER FRAME PINS ENGAGE
RF-39
AUXILIARY SYSTEM
RELIEF VALVE
HS-12
AUXILIARY PUMP
FAN PUMP
TO FAN
DISABLE
CIRCUIT
UPPER ACCESSORY VALVE
HS-2
HS-3
LOWER ACCESSORY VALVE
x
LEFT CRAWLER FRAME PINS DISENGAGE
RF-40
AUXILIARY SYSTEM
RELIEF VALVE
HS-12
AUXILIARY PUMP
FAN PUMP
TO FAN
DISABLE
CIRCUIT
UPPER ACCESSORY VALVE
HS-2
HS-3
LOWER ACCESSORY VALVE
x
VARIABLE OUTPUT VALVE
0 TO 15 gpm (57 l/min)
VARIABLE OUTPUT VALVE
0 TO 15 gpm (57 l/min)
HS-13
HS-14
HS-13
HS-14
SUCTION
MANIFOLD
SUCTION
MANIFOLD
X
X
FIGURE 1-41
(PAST PRODUCTION)
(PAST PRODUCTION)
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