918070/FP0811
3-13
Printed in U.S.A.
Ignition Key Switch
Note: The engine can only be started if the left control
lever console is pivoted down into the operation posi-
tion.
With the key in the fully counter-clockwise “P” posi-
tion, all power is shut off. The key can be inserted or
removed when the switch is in this position.
With the key in the “0” position, power to the acces-
sory circuit is turned on. The key can be inserted or
removed when the switch is in this position.
With the key in the “I” position, power is turned on to
all controls and electrical circuits. The battery charge
indicator light and the oil pressure indicator light will
come on.
With the key in the “II” position, the glow plug indica-
tor will come on while the glow plugs warm intake air
in cold weather.
With the key turned fully clockwise “III” and held in
position, the engine will crank/start and the indicator
lights should go out. Release the key after the engine
starts (the key returns to the “I” position when it is
released after starting the engine).
Note: The key must always be returned to the “I” posi-
tion between attempts to start the engine in order to
activate the glow plug system.
Figure 3-9 Ignition Key Switch
Battery Disconnect Switch
A battery disconnect switch is located in the engine
compartment under the hood. The switch allows elec-
trical lock out of all functions of the excavator. See
Figure 3-10. To disconnect battery and lock out all
electrical functions, turn key (1) of the battery discon-
nect switch to position (2) and remove it. To reconnect
battery and turn on all electrical functions, insert key
(1) into the battery disconnect switch and turn down to
the notched position (3).
Figure 3-10 Battery Disconnect Switch
0
P
I
II
III
1
3
2
1
3
2
1
3
2
Model 503Z -- Serial Numbers AH00579 to AH02282
Model 603 -- Serial Numbers AH00579 and up
Model 503Z -- Serial Numbers AJ02993 and up
Model 603 -- Serial Numbers AH00578 and before
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