Warning
Code
Name
Cause
Corrective Action
L63
Pressure switch
actuation
The pressure reached the
If there is nothing abnormal in the operation of the
main machine, review the set value for the pressure
switch or the delay time.
L67
Holding pressure
rotation speed drop
The flow channel (throttle
section) inside the safety valve
is clogged.
Clean the throttle of the safety valve.
Adjust the minimum rotational speed adjustment
throttle valve.
Replace the hydraulic oil.
L70
Reverse rotation
A run command has been
input immediately after a stop
while the load was excessive.
Increase the value of parameter P48.
Review the run timing and delay the timing for
issuing the start command.
11.4
44B
Periodic Maintenance
WARNING
Wear protective glasses and gloves for this work,
and do it with the power OFF.
When using air blow, take care to avoid getting
foreign matter in your eyes.
CAUTION
Note that oil will flow out from the piping during disassembly. Also, check that there is no residual
pressure in the piping before starting the work.
When the hydraulic oil in cylinders and piping is returned to the tank, the tank may overflow. Rather than
returning the hydraulic oil in cylinders to the tank, collect it in a separate oil receiver.
Check that there is no abnormal noise, abnormal vibration, or abnormal heat generation from this
product.
Inspection
Location/Item
Inspection
Timing/Interval
Inspection Instructions
Hydraulic oil
Oil level check
Oil temperature
check
Oil hue check
As necessary
As necessary
Once every 6
months
Check if there is a sufficient volume of oil. Also check that the hydraulic oil is not
cloudy and does not include air bubbles.
Check that the oil temperature is no higher than 60 C. (Keep it within 15 to 50 C
in normal use.)
Degradation of the hydraulic oil can be recognized based on its color. If the
hydraulic oil color changes toward brown and reaches ASTM level L4: bright
yellow, replace it.
Motor cooling fan
Motor unit
Once a month
Once a month
Check that the motor cooling fan is rotating and check for dust accumulation.
Accumulated dust will lessen the cooling effect, so it should be cleaned.
Check if the ambient temperature has exceeded 40 C.
