Grove Published 11-22-2016, Control # 345-12 2-53
RT9130E-2 SERVICE MANUAL HYDRAULIC SYSTEM
SOLENOID VALVES
Description
There are seven solenoid valves utilized in the crane
hydraulic system. When the solenoid is energized, the
plunger assembly forces the spool or poppet to shift, causing
the valve to open, close, or change it’s port flow paths. De-
energizing the solenoid allows spring force to shift spool or
poppet to its normal position. The oil cooler motor control
and the telescope rod drain solenoid valves are normally
closed two position two way solenoid valves. The outrigger
boost solenoid is a normally open two position two way
solenoid valve. The park brake, axle disconnect, and the
telescope two stage relief solenoid valves are two position
three way.
Oil Cooler Motor Control Solenoid Valve
The oil cooler motor control solenoid valve mounted on the
outside of the left superstructure side plate, is a normally
closed two position two way. When the solenoid is energized,
the valve opens to direct oil flow to the reservoir. When the
return manifold temperature reaches 120° F (49° C) power is
removed from the solenoid and the valve spring returns,
blocking the tank port and directing pressurized oil to the
cooler motor.
Cold Air Charge Fan Control Solenoid Valve
The oil cooler motor control solenoid valve mounted on the
outside of the left superstructure side plate, is a normally
closed two position two way. When the solenoid is energized,
the valve opens to direct oil flow to the reservoir. When the
return manifold temperature reaches 120° F (49° C) power is
removed from the solenoid and the valve spring returns,
blocking the tank port and directing pressurized oil to the
cooler motor.
Telescope Rod Drain Solenoid Valve
The telescope rod drain solenoid valve, mounted in-line off of
the telescope work port hydraulic tubing, is a normally closed
two position two way. When the solenoid is energized, the
valve opens to drain trapped pressure from the rod side of
the telescope cylinders to the reservoir. Trapped pressure is
directed from the rod sides of the cylinder via shuttle valve.
Outrigger Boost Solenoid Valve
The outrigger boost solenoid valve, mounted in-line off the
outrigger/rear steer valve is a normally open two position two
way. Excess flow from pump No. 2 and No. 3 is directed
through the valve to the reservoir in its de-energized
position. When the solenoid is energized, the valve closes
and directs pressurized oil to the inlet of the outrigger/rear
steer/box pin removal valve to boost the outrigger circuit
speed.
Parking Brake Solenoid Valve
The parking brake solenoid valve, mounted off of the carrier
right hand side rail, is a two position three way. In its de-
energized position, the inlet port is blocked and the parking
brake actuators are drained to the reservoir. When the
solenoid is energized, the reservoir port is blocked and
pressurized oil is directed to the actuators engaging the
parking brake.
Axle Disconnect Solenoid Valve
The axle disconnect solenoid, mounted off of the carrier right
hand side rail, is a two position three way. In its de-energized
position, the inlet port is blocked and the disconnect actuator
is drained to the tank. When the solenoid is energized, the
reservoir port is blocked and pressurized oil is directed to the
actuator.
Telescope Two-Stage Relief Solenoid Valve
The telescope two stage relief solenoid valve, mounted in-
line off of the pressure reducing sequence valve, is a two
position three way. In its de-energized position, the two stage
port relief in the center/outer mid section of the main
directional control valve is drained to the reservoir limiting
the center mid telescope cylinder to 2500 psi (1724 kPa).
When the solenoid is energized, pressurized oil is directed to
the relief valve to shift it to limit the outer mid telescope
cylinder to 3000 psi (2069 kPa).
Cross-Axle Differential Lock Solenoid Valve
The optional cross-axle differential lock solenoid valve
mounted off of the carrier right hand side rail, is a two
position four way. In its de-energized position, pressurized oil
is directed to disengage the actuator port and the engaged
actuator port is drained to the tank on both axle differentials.
When energized, the valve ports reverse, directing
pressurized oil to the engaged actuator port and drain the
disengage actuator port on both axle differentials.
Maintenance
NOTE: Valve Maintenance is limited to the removal of the
cartridges and replacing the solenoid coils and/or
seals.
Removal
1. Tag and disconnect the hydraulic lines from the valve.
Cap or plug all openings.
2. Tag and disconnect the electrical lines from the valve.
3. Remove the nuts and washers securing the valve to the
frame or sub plate and remove the valve.
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