OPERATING CONTROLS AND FEATURES GRT8120 OPERATOR MANUAL
3-24 Published 3-22-2021, Control # 702-02
Swing Enable/Disable Switch
The Swing Enable/Disable Switch (16, Figure 3-9) is a
momentary switch that is located on the left armrest.
Push switch one time to enable the swing function. Push
switch another time to disable the swing function.
The Swing Enable/Disable Indicator shows green in the
Status Bar (Figure 4-73) of the Operator Display Module
(ODM) when the swing function is enabled. The indicator
goes off when the swing function is disabled.
Enabling one craning function (hoist, lift, telescope, or swing)
using its related Enable/Disable Switch will cause the engine
speed to increase to 950 rpm. Disabling all craning functions
will cause the engine speed to decrease to 800 rpm.
Outrigger Extend/Retract Switch
The Outrigger Extend/Retract Switch (17, Figure 3-9) is a
three-position momentary switch that is located on the left
armrest.
Use Outrigger Extend/Retract Switch in combination with the
buttons on the Jog Dial or Navigation Control Pad, and the
Outrigger Extend/Retract Function Screen on the Operator
Display Module (ODM) to extend and retract the outrigger
beams and jacks.
Refer to Outrigger Extend/Retract, page 4-99 for complete
procedures on extending and retracting the outriggers.
NOTE: Push and hold the Outrigger Extend/Retract Switch
to change the ODM screen display to the Outrigger
Extend/Retract Function Screen.
Differential Lock Switch (Optional)
The optional Differential Lock Switch (18, Figure 3-9) is a
two-position momentary switch that is located on the left
armrest.
Use Differential Lock Switch to engage the differential lock
for additional traction. The Differential Lock can be activated
for a maximum of 30 seconds at a time.
NOTE: Crane must be in Four-Wheel-Drive to engage the
Differential Lock (refer to Drive Axle Selector
Switch, page 3-5).
Push and hold the Differential Lock Switch to engage the
Differential Lock. Release the switch to disengage the
Differential Lock. Refer to Differential Lock Operation, page
4-18 for more information on how and when to engage the
differential lock.
The Differential Lock Alert in the Alerts Area (Figure 4-68) of
the Operating Display Module (ODM) comes on (amber)
when the differential lock is engaged.
Rear Steer Switch
The Rear Steer Switch (19, Figure 3-9) is a three-position,
spring centered to off, rocker switch located on the left
armrest.
Use the Rear Steer Switch to turn the wheels on the rear
axle.
NOTE: The rear steer function will only operate when the
crane speed is less than 8 km/h (5 mph) as shown
on the Speedometer (7, Figure 4-70) on the
Operator Display Module (ODM).
If crane speed is greater than 8 km/h (5 mph) and
the rear steer switch is operated, the rear steer
function will not operate and the Speedometer will
flash.
Push and hold the right side of the Rear Steer Switch to
cause the wheels on the rear axle to turn left, causing the
crane to turn right as shown in Figure 3-10. Release the
switch when the rear wheels are pointed in the desired
direction.
Push and hold the left side of the Rear Steer Switch to cause
the wheels on the rear axle to turn right, causing the crane to
turn left as shown in Figure 3-11. Release the switch when
the rear wheels are pointed in the desired direction.
FIGURE 3-10
Direction
of Travel
9898-8
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