19
OPERATING INSTRUCTIONS
3.
Loosen air vent plug on engine fuel filter assembly
about 1-1/2 turns (Fig. 24).
4.
Rotate priming pump (Fig. 25) counter-clockwise
until spring in pump assembly releases. Operate pump
up and down until a solid stream of fuel flows out
around filter plug and tighten plug.
Figure 24
1. Fuel Filter Air Bleed Plug
1
5.
Loosen air vent plug on injection pump about
1-1/2 turns (Fig. 25). Operate priming pump until solid
stream of fuel flows from the vent hole (Fig. 25), then
tighten air vent plug.
6.
Push priming pump down to compress spring and
rotate clockwise to lock closed.
7.
Try to start engine. If engine starts, install left side
panel, lower hood and resume operation. If engine
does not start, repeat steps 2-7.
Figure 25
1. Priming Pump
2. Injection Pump Air Bleed plug
1
2
DIAGNOSTIC LIGHT
The GM 580-D is equipped with a diagnostic light
which indicates if the electronic controller is
functioning correctly. The green diagnostic light is
located under the control panel. When the electronic
controller is functioning correctly and the key switch is
moved to the ON position, the controller diagnostic
light will be illuminated. The light will blink if the
controller detects a malfunction in the electrical
system. The light will stop blinking and automatically
reset when the key switch is turned to the OFF position.
Figure 26
1. Electronic Controller Light
1
When the controller diagnostic light blinks, one of the
following outputs has been detected in the controller:
1
. One of the outputs has been shorted.
2.
One of the outputs is open circuited.
Using the diagnostic display, determine which output
is malfunctioning, refer to Checking Interlock
Switches.
If the diagnostic light is not illuminated when the key
switch is in the ON position, this indicates that the
electronic controller is not operating. Possible causes
are:
1.
Loopback is not connected.
2.
Fuses are blown.
3.
The light is burned out.
4.
Not functioning correctly.
5.
Fusible links are blown
Check electrical connections, input fuses and
diagnostic light bulb to determine malfunction. Make
sure loopback connector is secured to wire harness
connector.
Note: If the diagnostic light flashes during normal
operation of the machine, do not turn off the machine,
toggle to the output and touch any switch. The LED will
flash indicating the source of the failure.
DIAGNOSTIC ACE DISPLAY
The GM 580-D is equipped with an electronic
controller which controls most machine functions. The
controller determines what function is required for
various input switches (i.e. seat switch, key switch,
etc.) and turns on the outputs to actuate solenoids or
relays for the requested machine function.
For the electronic controller to control the machine as
desired, each of the input switches, output solenoids
and relays must be connected and functioning
properly.
The Diagnostic ACE display is a tool to help the user
verify correct electrical functions of the machine.
