JLG 800A Operation And Safety Manual page 62

Releasing the footswitch removes power from all controls
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 BOTTOM.
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SECTION 3 - MACHINE CONTROLS AND INDICATORS
2. Engine Malfunction Indicator
On machines prior to S/N 0300062045, the light turns on
and an alarm sounds when machine's power system requires
immediate service. Any of the following conditions will turn
on light and alarm: low engine oil pressure, 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 0300062045 to 0300183033, the light
indicates that the JLG Control System has detected a mal-
function 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.
– JLG Lift – 3-17