JLG boom lifts (450AJ, 600AJ, 800AJ, 460SJ, 660SJ, 860SJ, 1250AJP, M450AJ, M600JP)
JLG error code 4544 — TOWER LIFT PVG VALVE - SPOOL CANNOT REACH NEUTRAL
Message on the display: TOWER LIFT PVG VALVE - SPOOL CANNOT REACH NEUTRAL · flash code 4/5
Code 4544 occurs in machines: JLG 1250AJP, 1100S, 1100SJP.
blocking fault
The JLG display shows code 4544 with the message “TOWER LIFT PVG VALVE - SPOOL CANNOT REACH NEUTRAL”. It is a blocking fault or a safety-related code: do not use the machine until the cause has been found and removed.
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
- - 1250AJP only.
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 4544 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.