5-47
5
TROUBLESHOOTING
GEAR PUMP
“4. Disassembly and assembly, Gear pump”
Symptoms Major causes Remedies
No discharging operation •
Direction of rotation is incorrect
• Hydraulic oil tank level is too low
• Clogging in the suction piping or the
suction filter
• Viscosity of hydraulic oil is too high
• RPM is too low
• Rotate in the rated direction.
• Add oil to the specified level.
• Clean the piping.
• Replace with hydraulic oil of proper viscosity.
• Run at the rated RPM.
Noise is too loud, unusual
sound is heard
• Cavitation is being produced due to the
crushed hose or clogged filter of the
suction side
•
Joint in the suction side is loose and
sucking air
•
Cavitation is being produced due to too
high viscosity of the hydraulic oil
•
Pump and engine are not center
aligned
•
Frothing of hydraulic oil
• Remove the dirt and correct the crushing.
• Retighten each joint.
• Replace with hydraulic oil of proper viscosity.
• Center them again.
• Investigate the cause of frothing and correct it.
Oil leak from the oil seal • Oil seal is deformed, worn out or dam-
aged
•
Replace the oil seal.
Oil leak from the mat-
ing
surface between the
housing and the flange or
housing and the cover
•
Body seal is damaged, or the sliding
part is worn out
• Replace with a new one.
Discharge is insufficient • Bushing seal is damaged
• Cavitation is being produced
• Aeration is being produced
• The viscosity of hydraulic oil is too low
• Replace the bushing seal.
• Clean the suction filter and the suction piping.
• Check if piping is properly screwed in.
• Replace with hydraulic oil of proper viscosity.
GEAR PUMP
To Next Page
Loading...
