OPERATING CONTROLS AND FEATURES GRT8120 OPERATOR MANUAL
3-6 Published 3-22-2021, Control # 702-02
Hazard Lights Switch
The Hazard Lights Switch (6, Figure 3-2) is located on the
front of the steering column.
The switch is a two-position rocker switch (ON/OFF).
Push top of switch to cause the turn signal lights on the front
and back of the crane, and the turn signal indicator lights on
the steering column, to flash at the same time. Push bottom
of switch to cause these lights and indicators to go off.
Transmission Shift Lever
The Transmission Shift Lever (7, Figure 3-2) is located on
the right side of the steering column. The lever is used to
shift the transmission between forward, neutral, and reverse.
Push Transmission Shift Lever up to shift transmission to
forward gear. Push Transmission Shift Lever down to shift
transmission to reverse gear.
The lever sits in a detent when in the Neutral (center)
position. Thus, operator must first lift up on lever before
pushing it up or down.
A shift interlock system prevents the transmission from being
shifted between forward, neutral, and reverse, without first
pushing and holding the Service Brake Pedal
(2, Figure 3-14). Thus, crane must be stopped, and the
Service Brake Pedal pushed and held, before shifting
between forward and reverse gears.
NOTE: Transmission Shift Lever must be in Neutral
(center) position before the following operations
can be performed:
• Shifting transmission between two-wheel drive
(high range) and four-wheel drive (low range)
• Operating the outriggers
To shift transmission to first, second, or third gear, rotate
knob at end of the lever to I, II, or III.
The transmission has six forward gears and six reverse
gears. The transmission must be in Neutral (center) position
in order to shift to four-wheel drive low-range. To use the
three low gears, set Drive Axle Selector Switch
(5, Figure 3-2) to four-wheel drive. To use the three high
gears, set Drive Axle Selector Switch to two-wheel drive.
NOTE: The transmission will not shift into forward or
reverse gear without first pushing and holding the
Service Brake Pedal. Refer to Traveling —
Forward, page 4-16 and Traveling — Reverse,
page 4-17 for more detailed information on shifting
the transmission.
The Direction/Gear Indicator in the Crane Information Area
(Figure 4-70) of the Operating Display Module (ODM) shows
the direction of travel and the gear to which the transmission
is shifted.
Ignition Switch
The Ignition Switch (8, Figure 3-2) is located on the right side
of the steering column, below the Transmission Shift Lever
(7, Figure 3-2).
The Ignition Switch is key-operated and has three positions:
0 (OFF), I (RUN), and II (START).
In the OFF(0) position, most electrical power is off. Electrical
items that continue to operate include the horn, headlights,
turn signal/hazard/stop lights, dome light, and work lights.
Turn Ignition Switch to the RUN (I) position to energize all
electrical components except the starting circuit.
Turn Ignition Switch to the START (II) position to energize the
start circuit and crank the engine for starting. Release
ignition switch when the engine starts.
The Ignition Switch is spring-returned from START (II) to
RUN (I). Turn Ignition Switch to the OFF (0) position to stop
the engine.
The Ignition Switch has an anti-restart feature. After a failed
attempt to start the engine, the crane control system
prevents the engine from cranking again for approximately 6
seconds.
Steering Column Tilt and Telescope Lock
Lever
The steering control column can be rotated rearward
approximately 30° and telescoped approximately 60 mm
(2.3 in).
Rotate the Lock Lever (9, Figure 3-2) clockwise to lock the
steering column in place. Rotate the lever counterclockwise
to release the steering column for adjustment.
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