JLG 450A_AJ Series II Service Manual - Manual (Page 380)

SECTION 6 - JLG CONTROL SYSTEM
6-44 – JLG Lift – 3121180
TESTING VALVES Indicates valve test is beginning. Each valve is alternately energized and de-ener-
gized; checks are made for open- and short- circuit valve coils.
NOTE: In platform mode, the footswitch must be closed.
NOTE: Tower lift valves are not tested if TOWER LIFT=NO. Tower telescope
valves are not tested if TOWER TELE=NO. Jib valves are not tested if JIB = NO.
Extendable axle valves are not tested if EXT AXLES=NO. Four wheel steer valves
are not tested if 4WS=NO.
NOTE: Left/right jib valves are not tested unless JIB = SIDESWING.
Problems that can be reported include below messages.
CANT TEST VALVES There is a wiring problem, which prevents the valve test from functioning correctly.
Check valve wiring. Check ground alarm & hour meter wiring.
XXXXXXX S/C Named valve is drawing too much current so is presumed to be short-circuited.
Check valve wiring.
XXXXXXX O/C Named valve is drawing too little current so is presumed to be open-circuit. Check
valve wiring.
CHECKING INPUTS Indicates inputs test is beginning. Every input is checked to ensure that it is in its
“normal” position; function switches should be open, cutout switches should be
closed, joysticks should be in neutral.
In platform mode any non-neutral platform switch or joystick is reported; any
active cutouts are reported.
In ground mode any non-neutral ground switches is reported; any active cutouts
are reported.
NOTE: Switches not in use (due to the settings of machine digits), are not
checked.
NOTE: Pump pot is checked only for a wire-off condition; it can be at any demand
from creep to maximum.
Problems that can be reported include below messages.
CHECK XXXXXXX The named switch is not in its “normal” position. Check switch & wiring.
CHECK XXXXXXX JOY The named joystick appears to be faulty. Check joystick.
TESTING LAMPS Indicates lamps test is beginning. Each lamp is energized in turn; a prompt asks
for confirmation the lamp is lit.
ENTER must be pressed or clicked to continue the test.
NOTE: Lamps, which are not in use (due to the settings of machine digits), are not
checked.
NOTE: Platform Lamps are only tested in platform mode.
NOTE: The GM overload lamp and 500# capacity lamp are not tested.
NOTE: Head and tail lamps are tested in both platform and ground mode if
enabled by a machine digit.
TESTING ALARMS Indicates alarms test is beginning. Each alarm is energized in turn; a prompt asks
for confirmation the alarm is sounding.
ENTER must be pressed or clicked to continue test.
NOTE: Platform alarm and horn are only tested in platform mode.
NOTE: Ground alarm is not tested if GROUND ALARM = NO.
Table 6-5. System Test Messages
Message Displayed on
Analyzer
Message Displayed on
Analyzer
Description