Upright MX Series User Manual

73 “Translation of the original instruction”
6.6 A Certain Direction of the System will not Operate
Fault Description Method to repair
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.
Displacement limiter (if
installed)
The displacement limiter may be adjusted
incorrectly, causing the servo piston to
move in one direction.
Make sure the displacement limiter is
correct
S
CR (system check valve /
relief valve)
SCR valve failure or setting error
Make sure the SCR valve is working
correctly. If necessary, repair or replace
the valve.
Pump control
Damaged or deviated pump control will
make the pump work only in one direction.
Make sure the pump control function is
correct. Repair or replace the control
module if necessary.
Servo pressure
One of the servo pistons is leaking or the
oil supply line is clogged
Make sure the servo oil supply or drain
path is smooth and the size of each
damper hole is correct and clean. If
necessary, clean up or repair.
6.7 It’s difficult to find the Median or there is no median
Fault Description Method to repair
Input control signal (handle,
current or pressure)
Pump receive 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, a
djust, clear, repair or replace
the control module.
System pressure There have pressure leakage on both side
of the work circuit when there is no input
control signal.
Re-adjust the pump Median. See page 24
for adjustment procedures
Servo pressure There have pressure leakage on both sides
of the servo piston when there is no input
control signal.
Re-adjust the control Median. See page
25 to page 26 for adjustment procedures
PCP pressure (EDC only)
There have pressure leakage on both sides
of the control valve spool when there is no
input control signal.
Replace EDC

Upright MX Series Specifications

General

Brand	Upright
Model	MX Series
Category	Scissor Lifts
Language	English