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4-4 troubleshooting
4-4-1 Pump motor
Failure phenomenon possible reason
The hydraulic pump motor does not work
。
Poor connection or blown fuse.
Check the battery connection.
Check the key fuse.
Check whether the hydraulic pump motor may
cause the fuse to blow。
The key switch, upper limit switch, and line
contactor are not closed.
Turn off the key switch. Use a multimeter to
check the power flow through the key switch,
line contactor coil and line contactor. The key
switch must be turned off。
The voltage is not enough.
Charge the battery or replace the battery.
Check whether the cable terminals are tightly
matched with the battery terminals and the
control panel connector.
Check whether the wires inside the cable are
broken.
Incorrect operation of lifting and drive systems。
When the battery will not continue to work
normally
between。
The battery installed in the vehicle is too small.
Research and question the usage of the vehicle
under its full working conditions, select and
purchase the appropriate battery capacity to
understand the working time.
During the battery charging operation, the
battery is not fully charged。
The hydraulic system consumes excessive battery
power due to incorrect lifting or hydraulic control
for the working cycle.
The hydraulic pump motor is overheated.
If the motor temperature reaches 155°C (311°F)
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