Drive Locked - Joystick Moved Before Footswitch; Drive Prevented - Above Elevation; Drive Prevented - Boom Selected; Drive Prevented - Tilted & Above Elevation - JLG 1250AJP Troubleshooting Manual

SECTION 1 - FAULT DICTIONARY AND SELECTED TROUBLESHOOTING
Note Pretest Instructions
1.78.7 Tee in a gauge with the hoses
at the charge filter. Discon-
nect the front drive pump
charge pressure lines (ports
Fa and Fe). A jumper hose
between the fittings on the
pump is required to prevent
pump damage.
1.78.8 Disconnect, plug and cap all
four drive hoses at the bot-
tom of the swivel (ports 3, 4,
5, and 6). Tee in a gauge with
the hoses at the charge filter.
Plug open lines.
1.78.9 Disconnect hoses to trac-
tion valve ports A3, a4, A5,
A6, B3, B4, B5, and B6.
Plug/cap open lines and
ports. Tee a gauge in with the
hoses at the charge filter.

1.79 DRIVE LOCKED - JOYSTICK MOVED BEFORE FOOTSWITCH

Flash Code: 2-2
Drive locked - joystick moved before footswitch. Notification that drive was selected before and during footswitch signal
[X007.15] closure. Can be reported during power-up sequence. Allow the joystick to return to neutral before activating the
footswitch. This may also indicated a problem with the footswitch wiring.

1.80 DRIVE PREVENTED - ABOVE ELEVATION

Flash Code: 2-5
Drive prevented - above elevation. Notification that drive was selected while above elevation and drive cutout is configured to
prevent drive.

1.81 DRIVE PREVENTED - BOOM SELECTED

Flash Code: 2-5
Drive prevented - boom selected. Notification that drive was selected while a boom function was selected and drive cutout is
configured to prevent simultaneous drive & boom operation.
1.82 DRIVE PREVENTED - TILTED & ABOVE ELEVATION
Flash Code: 2-5
Drive prevented - tilted & above elevation. Notification that drive was selected while tilted and above elevation and tilt is con-
figured to cutout drive.
1-68
Test
Start engine and let it idle. Ensure hydraulic oil
has been warmed up. Does the gauge read
about 500psi?
Start engine and let it idle. Ensure hydraulic oil
has been warmed up. Does the gauge read
about 500psi?
Start engine and let it idle. Ensure hydraulic oil
has been warmed up. Does the gauge read
about 500psi?
1250AJP
Result Corrective Action
Yes Repair/replace right side drive pump
No Repair/replace left side drive pump.
Yes Shut down, and reassemble, but keep gauge
installed.
Go to step 1.78.9.
No Repair seals in swivel.
Yes Repair drive motor leakage or replace drive motor.
No Repair/replace traction valve.
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