Clark GTS 20 D, Operator'S Manual, Page: 49 / 128

Section 3. Operator Compartment and Controls
Operator Controls 3-11
Operator Controls
Key/Start Switch
The Key/Start Switch:
• Turns the truck electrical system on and off.
• Connects and tests the warning indicator lights.
• Connects the starter motor circuit when engine is to be
started.
The Key/Start Switch has three positions.
When the key is in the vertical "OFF"
position, all truck electrical circuits are off,
and the key can be removed. From the
"OFF" position, the key can be turned
clockwise to the "START" position, where
the starter motor is engaged and part of the
truck electrical system is energized. When
the key is released from the "START"
position, it automatically returns to the "ON"
position, where the starter is disengaged
and the entire truck electrical system is on.
The key switch has a mechanical "anti-restart" feature, which
prevents the engine starter from being engaged and damaged if the
operator attempts to start the engine when it is already running. The
key switch cannot be turned to the "START" position from the "ON"
position without returning the key to the "OFF" position. If the engine
stops running, the key switch must be turned to the "OFF" position
before it can be restarted.
Cold Start Preheating (Diesel Only)
With the switch in the "ON" position the warning indicator will light up
then the glow plugs are pre-heating automatically. The engine can
then be started. To repeat the preheating process turn the key to the
"OFF" and then into the "ON" position.
OFF
ON
START