OPERATING CONTROLS AND FEATURES GRT8120 OPERATOR MANUAL
3-16 Published 3-22-2021, Control # 702-02
Turntable Swing Lock Pin Control Handle
The Turntable Swing Lock Pin Control Handle (1, Figure 3-5)
is located on the right lower control panel.
To lock the superstructure in position, perform the following
steps:
1. Center the superstructure over the front or rear of the
carrier.
2. Turn Swing Lock Pin Control Handle counterclockwise
to unlock it.
3. Push forward on the control handle to cause the swing
lock pin to drop into the socket on the carrier frame.
4. Turn control handle clockwise to lock the swing lock in
position.
To unlock the superstructure, perform the following steps:
1. Turn control handle counterclockwise to unlock the
swing lock.
2. Pull rearward on the control handle to cause the swing
lock pin to pull out of the socket.
3. Turn control handle clockwise to lock it in position.
NOTE: Before driving the crane, always make sure that the
boom is centered over the front or rear of the
carrier, and that the turntable swing lock pin is
engaged.
12-Volt Outlet
The 12-Volt Outlet (2, Figure 3-5) is located on the right
lower control panel.
The 12-volt Outlet can power and charge electronic devices
having a maximum current of 15 amps or less.
Engine On-Board Diagnostic (OBD)
Connector
The Engine On-Board Diagnostic (OBD) Connector
(3, Figure 3-5) is located on the right lower control panel.
The connector allows the Cummins service software tool to
be connected to the engine electronic control unit (ECU) for
diagnosing issues that may occur.
A second Engine OBD Connector is located in the battery
box.
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