OPERATING PROCEDURES GRT8120 OPERATOR MANUAL
4-48 Published 3-22-2021, Control # 702-02
(5, Figure 3-13) pulses and the Main Hoist Lower
Indicator (Figure 4-73) comes on to indicate to the
operator that the main hoist is operating.
Raising the Main Hoist Rope
Dual Axis Controllers
1. Push the Main Hoist Enable/Disable Switch on right
armrest to enable the main hoist function.
The Main Hoist Enable Indicator in the Status Bar area
(Figure 4-73) of the ODM will come on (green).
2. Pull controller on right armrest rearward and hold to
raise the main hoist rope.
3. When hook block/overhaul ball gets to the desired
height, let controller return to the center (neutral)
position to stop raising the main hoist rope.
NOTE: When the main hoist controller is pulled rearward to
raise the rope, the Hoist Rotation Indicator
(27, Figure 3-9) pulses and the Main Hoist Raise
Indicator (Figure 4-73) comes on to indicate to the
operator that the main hoist is operating.
Single Axis Controller (Optional)
1. Push the Main Hoist Enable/Disable Switch on right
armrest to enable the main hoist function.
The Main Hoist Enable Indicator in the Status Bar area
(Figure 4-73) of the ODM will come on (green).
2. Pull outer controller on right armrest rearward and hold
to raise the main hoist rope.
3. When hook block/overhaul ball gets to the desired
height, let controller return to the center (neutral)
position to stop raising the main hoist rope.
NOTE: When the main hoist controller is pulled rearward to
raise the rope, the Hoist Rotation Indicator
(5, Figure 3-13) pulses and the Main Hoist Raise
Indicator (Figure 4-73) comes on to indicate to the
operator that the main hoist is operating.
Lowering and Raising the Auxiliary Hoist
Rope
NOTE: When load is stopped at desired height, the
automatic brake will engage and hold the load as
long as the controller remains in neutral.
Lowering the Auxiliary Hoist Rope
Dual Axis Controllers
1. Push the Auxiliary Hoist Enable/Disable Switch on left
armrest to enable the auxiliary hoist function.
The Auxiliary Hoist Enable Indicator in the Status Bar
area (Figure 4-73) of the ODM will come on (green).
2. Push controller on left armrest forward and hold to lower
the auxiliary hoist rope.
3. When hook block/overhaul ball gets to the desired
height, let controller return to the center (neutral)
position to stop lowering the auxiliary hoist rope.
NOTE: When the auxiliary hoist controller is pushed
forward to lower the rope, the Hoist Rotation
Indicator (27, Figure 3-9) pulses and the Auxiliary
Hoist Lower Indicator (Figure 4-73) in the Status
Bar area of the ODM comes on to indicate to the
operator that the auxiliary hoist is operating.
Single Axis Controller (Optional)
1. Push the Auxiliary Hoist Enable/Disable Switch on the
left armrest to enable the auxiliary hoist function.
The Auxiliary Hoist Enable Indicator in the Status Bar
area (6, Figure 4-67) of the ODM will come on (green).
2. Push inner controller on left armrest forward and hold to
lower the auxiliary hoist rope.
3. When hook block/overhaul ball gets to the desired
height, let controller return to the center (neutral)
position to stop lowering the auxiliary hoist rope.
DANGER
Two-Block Hazard!
To avoid death or serious injury, keep load handling
devices away from the tip of the boom or boom extension
when extending or lowering the boom and when hoisting
up.
DANGER
Crushing Hazard!
Keep area beneath load clear of all obstructions and
personnel when lowering or raising rope (load).
DANGER
Crushing Hazard!
Do not jerk controller when starting or stopping hoist.
Jerking controller causes load to bounce, which could
result in possible damage to the crane.
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