JLG electric boom lifts E300A, E300AJ, E300AJP and E600J, M600J
JLG message — PUMP POINT A LOW - CHECK POWER / MOTOR WIRING
Flash code 7/7
This message occurs in machines: JLG E600J, M600J.
blocking fault
Pump point A is near 0V when the pump MOSFETs are off. This is probably due to a motor or power wiring error.
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.
What you can do
Switch the machine off with the emergency stop and switch it on again. If the code comes back, do not use the machine and call service.
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 Manual E300A/E300AJ/E300AJP (3120772) and E600J/M600J (3121117, 3121813), Help Descriptions and Fault Flash 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 the message 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.