JLG 740AJ Operator Manual - Manual (Page 56)

SECTION 3 - MACHINE CONTROLS AND INDICATORS
3-16 – JLG Lift – 3121295
1. Footswitch/Enable Indicator
To operate any function, the footswitch must be
depressed and the function selected within seven sec-
onds. The enable indicator shows that the controls are
enabled. If a function is not selected within seven sec-
onds, or if a seven second lapse between ending one
function and beginning the next function, the enable
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.
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 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.