Operating Instructions
D21d
38
Water Temperature Warning Light/Horn
The water temperature warning light and horn
indicate that engine coolant temperature is above
the safe operating limit and the
engine is over-
heating.
If this light comes on, there may be a
problem with:
● Radiator cooling air flow (material packed into
radiator cooling fins, clogged air intake screen)
● Low coolant quantity in cooling system
● Engine alternator belt
● Thermostat function
● Cooling fan not operating
Stop the engine and correct the source of the
problem before further operation.
IMPORTANT:
Continued operation of the engine
with an illuminated water temperature warning light
MAY
result in severe engine damage.
Ignition Switch
The ignition switch is used to start and stop the
engine (and preheat the diesel engine). The
switch has four positions: is the glow plug pre-
heat position, “O” is the
OFF
position, “I” is the
ON
(RUN)
position that the key returns to after starting,
and is the
START
position. When starting the
engine, turn the key clockwise to the
START
posi
-
tion. Do not hold the key in the
START
position
longer than 10 seconds. If the engine does not
start, return the key to the “O” position for at least
60 seconds before making a restart attempt. Pro-
longed cranking can damage the starter motor and
shorten battery life. Release the key when the
engine starts, and it will return to the
ON (RUN)
position. To stop the engine, rotate the key coun-
terclockwise to the “O” position.
NOTE:
When starting the engine, turn and hold
the ignition key in the glow plug preheat position.
The time required is approximately 10 to 30 sec-
onds, depending on engine temperature. Refer to
Starting the Engine on page 39
.
OFF
START
Glow Plug Preheat
ON (RUN)
Ignition Switch
Light Switch (For Optional Lights)
Operates headlights (when installed).
Warning Horn
The warning horn sounds to alert the operator that
an
unsafe engine condition
is being indicated—
when engine coolant temperature is too high or
engine oil pressure is too low. If the horn sounds,
check the indicator lights and correct the problem
before further operation.
Circuit Breakers
Two manual reset circuit breakers are located on
the instrument panel. Each has a button that pops
out if the circuit breaker trips. The 10 amp circuit
breaker protects the circuits to the (optional) head-
lights and fuel pump. The 7 amp circuit breaker
protects the instrument panel circuits to the meters,
warning lights and warning horn, plus the safety
switch circuits, fuel valve solenoid, and the GHS.
In addition, both an auto-reset 30 amp circuit
breaker protecting the radiator cooling fan system
and an auto-reset 40 amp master circuit breaker
are mounted near the battery.