JLG 660SJ Operator Manual - Manual (Page 56)

SECTION 3 - MACHINE CONTROLS AND INDICATORS
3-20 – JLG Lift – 3121205
6. Glow Plug Indicator (Diesel Only)
When illuminated the glow plugs are operating. After
turning on ignition, wait until light goes out before crank-
ing engine.
7. Low Fuel Indicator (Yellow)
Indicates the fuel tank is 1/8 full or less. When the light
first turns on, there are approximately four usable gal-
lons of fuel remaining.
8. Malfunction Indicator
On all machines prior to S/N 48907 and machines with a
Deutz engine prior to S/N 61927, the light turns on and
an alarm sounds when machine’s power system
requires immediate service. Any of the following condi-
tions will turn on light and alarm: low engine oil pres-
sure, high engine coolant temperature, clogged engine
air filter, low alternator output, clogged hydraulic oil
return filter, or clogged charge pump filter.
On machines with Ford engines from S/N 48907 to S/N
61927, the light indicates that the Engine Control Sys-
tem has detected a malfunction and a Diagnostic Trou-
ble Code has been set in the system memory.
On machines after S/N 6T1927, the light indicates that
the JLG Control System has detected an abnormal con-
dition and a Diagnostic Trouble Code has been set in
the system memory.
Refer to the Service Manual for instructions concerning
the trouble codes and trouble code retrieval.
The malfunction indicator light will illuminate for 2-3 sec-
onds when the key is positioned to the on position to act
as a self test.