JLG 800A Operation And Safety Manual page 54

SECTION 3 - MACHINE CONTROLS AND INDICATORS
light will go out and the footswitch must be released and
depressed again to enable the controls.
Releasing the footswitch removes power from all con-
trols and applies the drive brakes.
TO AVOID SERIOUS INJURY, DO NOT REMOVE, MODIFY OR DISABLE
THE FOOTSWITCH BY BLOCKING OR ANY OTHER MEANS.
FOOTSWITCH MUST BE ADJUSTED IF FUNCTIONS ACTIVATE WHEN
SWITCH ONLY OPERATES WITHIN LAST 1/4" OF TRAVEL, TOP OR BOT-
TOM.
3-14
2. Engine Malfunction Indicator
On machines prior to S/N 62045, 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 from S/N 62045 to present, the light indi-
cates that the Engine Control System has detected a
malfunction and a Diagnostic Trouble Code has been
set in the system memory. Refer to the Service Manual
for instructions concerning the trouble codes and trou-
ble 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.
– JLG Lift – 3121209