Mazak VTC-160A, Maintenance Manual, Page: 60 / 96

5-6
5-4 Hydraulic System
5-4-1 Troubleshooting
Symptom Check Points and Probable Causes Corrective Action Refer to
1. Insufficient oil amount in the
hydraulic unit tank.
Replenish the specified oil. 4-6-1
2. The hydraulic unit filter is
clogged.
Clean the filter. 4-6-1
3. Oil viscosity is too high. Change the oil to the specified oil. 7-1-2
4. Hydraulic unit pump or motor is
defective.
(There are no problems with the
wiring.)
5. The relief valve of the hydraulic
unit is defective.
•
Pressure is always lower than 70
kgf/cm
2
(996.1 PSI).
•
Hydraulic oil is not discharged.
•
Heat generation from the pump or
motor is excessive.
6. Oil leak in the hydraulic circuit.
Contact Mazak Technical Center.
－
1. The hydraulic unit filter is
clogged.
Clean the filter. 4-6-1
2. Insufficient oil amount in the
hydraulic unit tank.
Replenish the specified oil. 4-6-1
3. Bolts used in the hydraulic unit
get loose.
Tighten the bolts.
－
•
Noise level gets higher.
• Abnormal noise is generated.
4. Hydraulic unit pump or motor is
defective.
Contact Mazak Technical Center.
－
•
Oil amount in the hydraulic unit
tank reduces.
1. There is oil leak in the hydraulic
unit circuit.
Contact Mazak Technical Center.
－
5-4-2 Maintenance of the Hydraulic Unit
1. Changing the hydraulic pressure gauge
!
l
Switch off the power before changing the hydraulic pressure gauge. Otherwise, you may
sustain serious or fatal injury.
< Procedure >
(1) Loosen and detach the pressure gauge.
(2) Mount the new pressure gauge after winding the threads with sealing tape.
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