Grove Published 01-29-2015, Control # 512-01 8-73
TMS700E SERVICE MANUAL UNDERCARRIAGE
Testing Pilot Operated Check Valve for Leakage
1. Fully extend and set the outriggers.
2. Remove the piston side cylinder hose from the
suspected leaking jack cylinder (see Figure 8-70). Oil
will flow until the cavity in the cylinder port block empties.
Once the port block cavity empties, oil should stop
flowing from the piston side port.
a. If oil stops flowing
, the cylinder’s pilot operated
check valve is sealing properly.
b. If oil continues to flow
out the piston port, the
cylinder’s pilot operated check valve is leaking.
If oil flow is not noticed from either port, the cylinder and pilot
operated check valve are functioning properly, and any
cylinder contraction during normal operation can be
attributed to thermal contraction of the oil.
OUTRIGGER SYSTEM VALVES
Description
There are five valve assemblies responsible for controlling
the outrigger system, the integrated outrigger valve, the front
and rear outrigger control manifolds, and the pilot operated
check valves.
NOTE: For a more detailed description and maintenance
of the valves, refer to Valves, page 2-19.
Pilot Operated Check Valve
The pilot operated check valves are located in the outrigger
jack port blocks. The check valve provides two functions; the
first function is a holding valve, the second function provides
a thermal relief of the jack.
Integrated Outrigger Valve
The integrated outrigger valve is mounted on the front face of
the carrier frame rear cross member. The valve consists of
an enable solenoid valve, a three position four-way solenoid
controlled directional control valve, a main relief valve, and
two thermal relief valves.
Outrigger Control Manifold
The front and rear outrigger control manifolds are located
inside the frame on the respective outrigger box. The rear
manifold consists of four 12 volt solenoid valves and
assembly mounting hardware. The front manifold consists of
five 12 volt solenoid valves and assembly mounting
hardware.
Center Front Jack Circuit Relief Valve
The center front jack circuit relief valve is mounted on the
front outrigger box next to the front outrigger control
manifold. The valve prevents over pressurization of the
center front jack circuit.
CENTER FRONT JACK CYLINDER
Description
The center front jack cylinder has a 8.9 cm (3.5 in) diameter
bore and is the double acting type. The cylinder is pinned
into a tube which is welded onto a special crossmember on
the front end of the carrier frame. A port block is welded to
the end of the cylinder rod and a pilot operated check valve is
threaded into the port block. Internal seals are used within
the cylinder to prevent internal and external leakage. A wiper
ring is on the cylinder barrel to wipe dirt from the rod as it is
retracted.
The cylinder weighs approximately 57 kg (126 lb).
Maintenance
NOTE: Refer to Cylinders, page 2-52 for disassembly and
assembly of the cylinder.
See Figure 8-71 for cylinder installation.
Removal
1. Remove the screws, washers, lockwashers, and nuts
securing the tilt plate. Remove tilt plate.
2. Remove the bolts, lockwashers, and nuts securing the
float pad to the cylinder ball and remove the float pad.
3. Remove the washer and nut securing the cylinder tube
cap to the cap bracket.
4. Tag, disconnect, and cap the hydraulic lines to the
cylinder.
5. Place a jack capable of supporting the weight of the
cylinder at the base of the cylinder barrel. Jack up the
cylinder just enough to relieve any pressure on the
cylinder retaining pin.
6. Remove the two cotter pins securing the cylinder
retaining pin and remove the cylinder retaining pin and
cylinder cap bracket.
CAUTION
When performing step number 2, remove hose to adapter
connection slowly. Trapped pressure may exit between
the outrigger cylinder and the work port pilot operated
check valves in the outrigger selector valve.
Reference Only
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