Sinoboom GTJZ0612E, Maintenance Manual

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MAINTENANCE PROCEDURES
GTJZ0612E&0812E&1012E&1212E Maintenance Manual 5-23 © Jul.2020
Problem Cause Solution
The platform controller
does not lower when
there is no alarm
The platform is limited to 1.2
m
Reset the handle and resume lowering.
The platform controller
does not lower when
the machine has no
load and is level
Height calibration is wrong/
lifting valve has trouble
• Inspect whether the on-off input plug is inserted
properly and firmly.
• Inspect whether the wiring of the plug switch is
malfunctioning.
• Re-calibrate the height.
• Inspect whether the connection of the lead of the
lifting valve is wrong, and whether the lifting valve is
malfunctioning.
The platform does not
lift to the maximum
position when the
machine has no load
and is indoors
The height has not been
calibrated/the travel switch is
incorrect
• Re-calibrate the height.
• Change the setting of the travel switch.
The platform refuses to
rise further after
reaching a certain
position
The travel switch setting is
incorrect
Reset the travel switch.
An overweight warning
appears when the
machine has no load
The load has not been
calibrated/this is the first
lifting/lowering
• Re-calibrate the load coefficient.
• Lift and lower it several times.
The forward function
fails without a warning The forward moving capability
is malfunctioning
• Check whether the PWM plug of the controller on
the lower platform is inserted correctly and solidly.
• Check whether the connection of the forward valve
is normal.
• Inspect whether the platform controller is
malfunctioning.
The backward function
fails without a warning The backward moving
capability is malfunctioning
• Check whether the PWM plug of the ground
controller is inserted correctly and solidly.
• Check whether the connection of the forward valve
is normal.
• Inspect whether the lower platform controller is
malfunctioning.
There is no warning
after descending to the
minimum limiting
position
Pothole protector
• The high-speed hydraulic valve is connected
incorrectly.
• The installation of the travel switch is abnormal.
• The hydraulic valve is malfunctioning.
Tilting warning
The level switch is abnormal
• The level switch air bubble is not in the middle
position.
• The level switch is not connected properly or firmly.
• The ground controller is malfunctioning.