Upright MX Series User Manual

71 “Translation of the original instruction”
6.4 System Unresponsive
Fault Description Method to repair
Oil tank level System circuit oil supply is insufficient Add proper amount of clean oil
Input control signal
(handle, current or
pressure)
Pump receives an error control signal .
(MDC-
handle is bound or have been
broken, EDC-
signal is incorrect or
insufficient, HDC-
damping hole control
pipeline is blocked or error)
Make sure that the input signals received in both
directions are correct
Pump control The pump's control module or the control
spool is damaged, will cause the control
signal not be properly transmitted to the
pump
To ensure that the pump control operation is correct
and the control spool is not damaged or the use of
time is too long, the spool should move in the cavity
normally. If necessary, clean, repair or replace the
pump's control module or control spool.
Bypass valve
A partially open bypass valve will cause the
cross port to leak
Make sure the bypass valve is closed and set
correctly. If necessary, clean, repair or replace the
bypass valve.
SCR (system check
valve / relief valve)
SCR valve one-way or two-way valve core
movement blocked
Make sure the SCR valve is working properly. If
necessary, repair or replace the valve.
Charge pressure
(median)
Charge pump damage or charge relief
valve set pressure is low, resulting in the
charge pressure is too low.
Check the charge pump is damaged or not and that
the charge relief valve is set correctly or not. If
necessary, repair or replace the charge pump or oil
relief valve.
Charge pressure
(variable)
Internal leakage causes the system to fill
the oil pressure too low
Repair or replace the components that cause
leakage
Servo pressure Lackage of pressure at bot
h ends of the
Servo piston
Check the servo pressure of ports M4 and M5 to
determine that there is sufficient pressure
differential. Make sure that the servo oil supply or
drain path is smooth and that the size of each
damper hole is correct and clean, clean or repair if
necessary.
Charge pump
The charge pump is damaged or installed
in the wrong direction
Make sure the charge pump is working properly and
installed correctly. If necessary, repair or replace the
charge pump.

Upright MX Series Specifications

General

Brand	Upright
Model	MX Series
Category	Scissor Lifts
Language	English