Grove Published 11-10-2014, Control # 524-00 8-37
RT880E SERVICE MANUAL UNDERCARRIAGE
3. Remove the cylinder cap.
4. Place a jack capable of supporting the weight of the jack
cylinder at the base of the cylinder barrel. Jack up the
cylinder just enough to relieve any pressure on the cylin-
der retaining pin.
5. Remove the cotter pins securing the cylinder retaining
pin and remove the cylinder retaining pin and cylinder
cap retaining bracket.
6. Jack the jack cylinder up just enough to insert the retain-
ing pin back into the cylinder. Insert the retaining pin into
the lugs on the cylinder and secure the pin in place with
the cotter pins.
7. Fasten a nylon strap onto the cylinder retaining pin and
use an adequate lifting device to lift the jack cylinder out
of the tube on the beam assembly.
Installation
1. Apply grease (EPMPG) to the ID of the jack cylinder
support tube.
2. If removed, install wear ring in groove in bottom of sup-
port tube and in groove at top on jack cylinder.
3. Place a jack beneath the cylinder tube on the outrigger
beam. Using the same method as described under
Removal, lower the jack cylinder into the cylinder tube
on the outrigger beam until the retaining pin is just above
the tube. Position the jack so that it will support the cylin-
der in this position. Remove the lifting device from the
cylinder.
4. Remove the retaining pin and cotter pins from the cylin-
der.
5. Lower the jack until the holes in the cylinder rod align
with the holes in the outrigger beam.
6. Apply anti-seeze compound to the retaining pin. Secure
the cylinder and cylinder cap retaining bracket to the
support tube with the retaining pin and cotter pins.
7. Install the cylinder cap.
8. Install the fittings in the cylinder ports and connect the
hoses as tagged during removal.
Functional Check
1. Activate the hydraulic system.
2. Extend and retract the jack cylinder.
3. Check for smooth operation of the cylinder.
4. Check all hydraulic connections and hoses for evidence
of leakage.
Outrigger Jack Cylinder Internal Leak Test
Use the following procedure to troubleshoot and diagnose an
internal leak, a leaking pilot operated check valve or a
thermal contraction on an outrigger jack cylinder.
Checking Cylinder for Internal Piston Seal Leak
1. Fully extend and set the outriggers.
2. Remove the rod side cylinder hose from the suspected
leaking jack cylinder (see Figure 8-36). Oil will flow until
the cavity in the cylinder port block empties. Once the
port block cavity empties, oil should stop flowing from
the rod side port.
Check for the following conditions:
CAUTION
Use a nylon strap to remove the cylinder. This will ensure
the retaining pin is not damaged.
DANGER
Perform the following procedures with the crane
positioned on a firm level surface with outriggers fully
extended and set, and the crane in the travel position
Remove hoses from one cylinder at a time.
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.
FIGURE 8-36
Piston Port
Rod Port
6432
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