TROUBLESHOOTING
GEAR PUMP
1
5
GEAR PUMP 5I1AQ00
GEAR PUMP
“4. Disassembly and assembly, Gear pump”
Symptoms Major causes Remedies
No discharging operation • Direction of rotation is incorrect. • Rotate in the rated direction.
• Hydraulic oil tank level is too low. • Add oil to the specified level.
• Clogging in the suction piping or the
suction filter.
• Clean the piping.
• Viscosity of hydraulic oil is too high. • Replace with hydraulic oil of proper viscos-
ity.
• RPM is too low. • 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.
• Remove the dirt and correct the crushing.
• Joint in the suction side is loose and
sucking air.
• Retighten each joint.
• Cavitation is being produced due to too
high viscosity of the hydraulic oil.
• Replace with hydraulic oil of proper viscos-
ity.
• Pump and engine are not center
aligned.
• Center them again.
• Frothing of hydraulic oil. • Investigate the cause of frothing and cor-
rect it.
Oil leak from the oil seal
• Oil seal is deformed, worn out or dam-
aged.
• Replace the oil seal.
Oil leak from the mating
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. • Replace the bushing seal.
• Cavitation is being produced. • Clean the suction filter and the suction pip-
ing.
• Aeration is being produced. • Check if piping is properly screwed in.
• Viscosity of hydraulic oil is too low. • Replace with hydraulic oil of proper viscos-
ity.
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