Manitowoc Grove GRT8120 User Manual

Grove Published 3-22-2021, Control # 702-02 4-21
GRT8120 OPERATOR MANUAL OPERATING PROCEDURES
4
5. Fully extend the four outrigger jacks.
6. Begin the automatic level process using the Outrigger
Extend/Retract Switch and the Operator Display Module
(refer to Leveling the Crane Using Auto-level, page
4-104).
The crane will react in the following manner:
a. Briefly extend all four jacks
b. Briefly retract all four jacks
c. Begin adjusting by lowering two jacks at once until
level position is reached.
d. There may be several long pauses after lowering for
the inclination sensor to stabilize – keep holding the
buttons through these.
7. Auto-level process is complete when crane is
out-of-level by less than 0.1 degrees and the Auto-level
Indicator (1, Figure 4-101) flashes.
Outrigger Monitoring System (OMS) (Optional—
Standard in North America and European Union
Countries)
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.
Outrigger setup is the same for cranes equipped with OMS;
refer to Setting the Outriggers Manually, page 4-19.
If crane is setup on outriggers and “On Outriggers” is
selected when programming the RCL, then the OMS
indicates to the RCL the horizontal position of each of the
four outrigger beams. If the outrigger beam configuration
programmed by the operator does not match that which is
detected by the Outrigger Monitoring System, an outrigger
beam over-ride warning screen will appear (refer to
Outrigger Span, page 4-161). The RCL does not lock-out the
crane or select a different load chart based on the outrigger
beam position that is identified by the OMS.
Stowing the Outriggers
1. Enable the outrigger functions by doing the following:
- Shift transmission to neutral
- Engage the Parking Brake.
- Engage four-wheel drive
- Disable all crane functions
- Fully lower cab
2. Retract the four outrigger jacks using the Outrigger
Extend/Retract Switch and the Operator Display
Module.
Refer to Extending/Retracting Individual Outrigger
Jacks, page 4-102 to operate individual outrigger jacks.
Refer to Extending/Retracting the Outrigger Jacks - x4,
page 4-103 to operate the four jacks at the same time.
Retract the four outrigger jacks until they have adequate
clearance to remove the outrigger pads.
3. Release locking levers and allow outrigger pads to drop
to the ground.
4. Continue to retract jacks until all four jacks are fully
retracted.
5. If required, fully retract the outrigger beams using the
Outrigger Extend/Retract Switch and the Operator
Display Module.
NOTE: More than one outrigger beam may be retracted at
a time.
6. Stow outrigger pads (Figure 4-4).
DANGER
Keep feet and hands clear of outrigger pads when
unlocking the pads from the jacks.
Item Description
1 Outrigger Pad Assembly
2 Quick Pin with Lanyard
1
FIGURE 4-4
9230
2

Manitowoc Grove GRT8120 Specifications

General

Brand	Manitowoc
Model	Grove GRT8120
Category	Construction Equipment
Language	English