UNDERCARRIAGE GRT880 SERVICE MANUAL
8-32
Published 10/19/2017, Control # 618-00
Extension Cylinder
Description
Two outrigger extension cylinders are utilized within each
outrigger box assembly. The extension cylinders provide the
force for the outrigger beam’s horizontal movement. The
cylinder weighs approximately 53.2 kg (117.3 lb).
Maintenance
NOTE: Refer to Cylinders in Hydraulic System, page 2-1
for Disassembly and Assembly of the cylinder.
Removal
1. Extend the outrigger beam until the second side access
hole is exposed (see Figure 8-30). Shut off the engine.
2. Remove the cotter pin and clevis pin securing the rod
end of the extension cylinder to the outrigger beam.
3. Remove the cotter pin and clevis pin securing the piston
end of the extension cylinder to the outrigger box.
4. Pull the extension cylinder from the outrigger beam until
the hydraulic hoses on the rod end of the cylinder can be
accessed. Tag and disconnect the hoses from the rod
end of the cylinder. Cap or plug all openings.
5. Remove the cylinder.
Installation
1. Place the cylinder in the beam.
2. Position the extension cylinder so the hydraulic ports on
the rod end of the cylinder can be accessed. Connect
the hydraulic hoses to the ports as tagged during
removal. Verify the piston side of the extension cylinder
is connected to the solenoid valve bank to prevent
damage.
3. Push the cylinder into the outrigger beam. Align the
cylinder rod with the clevis in the beam. Apply anti-seeze
to the clevis pin and secure in place with the clevis pin
and cotter pin.
4. Align the cylinder piston with the clevis in the outrigger
box. Apply anti-seeze to the clevis pin and secure in
place with the clevis pin and cotter pin.
Functional Check
1. Activate the hydraulic system. Fully extend and retract
the outrigger.
2. Observe the operation of the outrigger beam. If hydraulic
lines are reversed, stop immediately and connect lines
properly per instructions. Verify no jack cylinder hose is
trapped by full outrigger beam retraction. If any is, stop
immediately and install lines properly to avoid trapping.
3. Check the hydraulic connections and hoses for any
evidence of leakage. Make repairs as needed.
Outrigger Monitoring System (Optional—
Standard in North America)
Description
The Outrigger Monitoring System (OMS) aids the operator in
accurately programming the Rated Capacity Limiter (RCL)
by automatically identifying the horizontal position of each
outrigger beam. The OMS uses four sensors, one per
outrigger beam, to indicate when an outrigger beam is
positioned to one of three pre-defined locations, including
fully retracted, mid-extend, and fully extended.
If the crane is setup on outriggers and “On Outriggers” is
chosen when programming the RCL, then the OMS indicates
to the RCL the horizontal position of each of the four
outrigger beams. Based on this information, the RCL will
default to the most conservative outrigger beam
configuration; that is, if three outriggers are fully extended
and one is retracted, the RCL will select retracted as the
outrigger configuration. A confirmation of this outrigger
configuration is all that is needed. Refer to the Rated
Capacity Limiter Operator’s Handbook for detailed
instructions.
Removal
1. Remove outer access cover plate from outrigger box.
2. Remove OMS string potentiometer connector (see
Figure 8-31) from attaching point on outrigger beam.
NOTE: Avoid free-release of cable to prevent damage to
the OMS string potentiometer.
3. Disconnect electrical harness connector and secure to
avoid damage.
4. Remove two nuts, four washers, and two bolts securing
OMS string potentiometer mounting bracket to outrigger
box.
5. Remove four nuts, eight washers, and four bolts
securing OMS string potentiometer to mounting bracket.
Reference Only
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