OPERATING PROCEDURES GRT655/655L OPERATOR MANUAL
4-24 Published 3-23-2020, Control # 654-04
CRANING FUNCTIONS
Controller Operation
The controller operation for crane functions is proportional –
that is, the closer the lever is to neutral (center), the slower
the system responds. Return the controller to neutral to hold
the load. Do not feather hoist control to hold the load.
NOTE: Always operate controllers with slow, even
pressure.
Proper Crane Leveling
If a crane is not level within 1% of grade, allowable capacities
must be reduced. Therefore, whether lifting on rubber or
outriggers, it is essential the crane is level to within 1% of
grade. The bubble level indicator provided on the crane is
calibrated to be accurate within 1% of grade.
To properly level the crane, the boom must be positioned
over front of the crane, fully lowered to horizontal and fully
retracted and the cab must be in its fully lowered position.
Raise and level crane following instructions for Using the
Outriggers, page 4-24.
A working crane may settle during lifting operations.
Frequently check the crane for level. When rechecking the
crane for level, the boom must be positioned over the front of
the crane, fully lowered to horizontal and fully retracted and
the cab must be in its fully lowered position. If necessary,
relevel the crane following instructions for Using the
Outriggers, page 4-24.
Bubble Level Indicator Adjustment
The Level Indicator should be checked periodically. if it is
suspected that the Level Indicator is out of adjustment, verify
and adjust the level as follows:
1. Position crane on a firm, level surface.
2. Fully lower the cab.
3. Extend and set outriggers. Level crane, as indicated by
the level indicator, using the outriggers.
4. Place a miracle pointer level, carpenter level, or similar
type device on a machined surface such as the turntable
bearing or bearing mounting surfaces.
5. Using the outriggers, level crane as indicated on the
leveling device used in step 3.
6. Using level indicator mounting screws, adjust level
indicator to show level.
Using the Outriggers
Outriggers are extended and retracted from the Operator
Display Module (ODM) in the cab [refer to Using the
Operator Display Module (ODM), page 4-35].
DANGER
To prevent serious injury or death, keep clear of moving
outrigger beams/jacks.
DANGER
Death or serious injury could result from improper crane
setup on outriggers.
WARNING
Be sure the outriggers are properly extended and set, and
the crane is level for operation on outriggers.
All four outrigger beams must be equally extended to the
mid position vertical stripe or fully extended position
before beginning operation.
WARNING
When operating the crane on outriggers, the outriggers
should always be extended and set in the proper position
corresponding to the load capacity chart to be used. Mid
extended outriggers must also be locked in position.
To Next Page
Loading...
Need help?
General
