JLG boom lifts (450AJ, 600AJ, 800AJ, 460SJ, 660SJ, 860SJ, 1250AJP, M450AJ, M600JP)
JLG error code 8340 — JIB IN-LINE SWITCH/SENSOR DISAGREEMENT
Message on the display: JIB IN-LINE SWITCH/SENSOR DISAGREEMENT
Code 8340 occurs in machines: JLG 1250AJP.
warning / function limited
The UGM detected the Jib Lock Pin is locked and the Jib Swing Angle sensor is reading greater than ±1 degree. Machine function is restricted to unrestricted capacity mode, high speed drive is disabled, and only drive, swing and jib swing are allowed. Fault cleared upon correction of issue
Description from the JLG service manual, in the original wording.
Possible causes
The manual does not list the causes for this code: the service technician establishes them during diagnosis of the machine.
Checks from the manual
- Verify Jib Lock Pin Proximity and Jib Swing Angle Sensors are working correctly. Verify wiring per electrical schematic. Recalibrate Jib Swing Sensors.
What service does
A qualified service technician reads the code with the manufacturer's diagnostic tools, finds the cause, clears the code and carries out a function test.
Source: JLG Service and Maintenance Manuals: 600AJ (3121201), 800AJ (3120858), 460SJ, 860SJ, 1250AJP (3122581800), M450AJ (3121829), M600JP (3121711), Diagnostic Trouble Codes tables.
The descriptions are quoted from the manufacturer's service documentation and are for guidance only. Clearing codes, calibrations and repairs are carried out by a qualified service technician according to the manual for the specific serial number. A machine with an active blocking code must not be used until the cause has been removed.
Does code 8340 not go away?
RK Rental services JLG lifts at our workshop or on site at the customer's premises (construction site, factory, warehouse). We read the code, remove the cause and select the parts by serial number.