Grove Published 11-22-2016, Control # 345-12 8-23
RT9130E-2 SERVICE MANUAL UNDERCARRIAGE
OUTRIGGER CIRCUIT
Description
The outrigger circuit consists of four extension cylinders, four
jack cylinders, an integrated outrigger/rear steer valve, front
and rear outrigger control manifolds, pilot operated check
valves and four Outrigger Monitoring System (OMS)
(Optional—Standard in North America) string
potentiometers. The front two extension cylinders are
mounted in the front outrigger beams and the rear two
extension cylinders are mounted in the rear outrigger beams.
The front and rear outrigger beams are mounted in their
respective outrigger boxes; in turn a jack cylinder is mounted
on the end of each outrigger beam. The integrated outrigger/
rear steer valve is mounted on the front face of the carrier
frame front cross member. The front and rear outrigger
control manifolds are mounted on the inside center of their
respective outrigger box. An OMS string potentiometer (if
equipped) is mounted inside each outrigger box. The
potentiometer is connected by a cable to the outrigger beam
to monitor the beam’s position—fully retracted, mid-extend,
or full extended.
The outrigger selector controls are located in the cab on the
front console. Both the integrated outrigger valve and the
manifold solenoid valves are electrically actuated from these
controls. The solenoid switches must be held depressed to
actuate the solenoid valve. The integrated outrigger valve
switch is spring loaded to the off position. The console is
labeled with switch positions.
A sight bubble level is mounted on the right side of the cab by
the right side controls. The sight bubble level provides the
operator with a visual indication of crane level attitude.
Theory Of Operation
The appropriate Extension/Jack Switch must be depressed
before the Outrigger Extend/Retract Switch is depressed.
Depressing one of the outrigger selector switches causes
that solenoid valve to open. As the Outrigger Switch is
moved, the integrated outrigger valve spool shifts allowing
flow to either the extend or retract line as applicable. If the
Outrigger Switch is in the EXTEND position, the flow
continues through the open solenoid valve to the piston side
of the cylinder. If the jack is to be extended, the flow first
unseats the cylinder check valve then extends the cylinder.
The oil from the rod end flows through the integrated
outrigger valve, and then to the reservoir.
When the Outrigger Switch is in the RETRACT position, the
flow through the selector valve is directed to the rod side of
the cylinder. The oil in the piston side flows through the open
solenoid back to the integrated outrigger valve. If a jack
cylinder is to be retracted, pilot pressure from the
pressurized retract line unseats the cylinder check valve
allowing oil to flow from the piston side through the open
solenoid valve to the integrated outrigger valve. The
integrated outrigger valve directs the flow to the reservoir.
The integrated outrigger/rear steer valve contains three relief
valves. The main relief is set at 3500 psi (24,133 kPa).
Thermal relief protection is provided on the extend side by a
4000 psi (27,580 kPa) relief valve. Thermal relief protection
is provided on the extend side by a 4000 psi (27,580 kPa)
relief valve.
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