Upright MX Series User Manual

72 “Translation of the original instruction”
6.5 The System will not Operate in Both Directions
Fault
Description
Method to repair
Oil tank level
System circuit oil supply is insufficient
Add proper amount of clean oil
Displacement limiter
The displacement limiter is misaligned so
that the servo piston is locked
Make sure the displacement limiter is set correctly
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. If necessary, adjust, clear,
repair or replace the control module.
Hydraulic oil filter
Blocked filters may cause the system's oil
supply to be insufficient
Check the hydraulic oil filter to determine if it can
continue to work properly. Replace the filter if
necessary.
Bypass valve
A partially open bypass valve (one or two)
will cause the cross port to leak
Make sure the bypass valve is closed and properly
e
ngaged with the valve seat. If necessary, clean,
repair or replace the bypass valve
Charge pressure (median)
The charge pressure is insufficient, so that
the system circuit can not be provided
enough oil
Check if the charge pump is damaged. Make sure
the
oil relief valve is set correctly. Repair or replace
the charge pump if necessary.
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 both ends of the Servo
piston
Check the servo pressure to ensure both ends of
the differential pressure. Make sure that the servo
supply and drain lines are smooth and that each
damper is dimensioned and clean. If necessary,
clean up or repair.
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.
SCR (system check valve /
relief valve)
SCR valve failure or setting error
Make sure the SCR valve is set correctly. If
necessary, repair or replace the valve.

Upright MX Series Specifications

General

Brand	Upright
Model	MX Series
Category	Scissor Lifts
Language	English