Takeuchi TB215R Workshop Manual page 278

GEAR PUMP
"4. Disassembly and assembly, Gear pump"
Symptoms
No discharging operation • Direction of rotation is incorrect.
Noise is too loud, unusual
sound is heard
Oil leak from the oil seal
Oil leak from the mating
surface between the
housing and the flange or
housing and the cover
Discharge is insufficient
GEAR PUMP
Major causes
• 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.
• 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.
• Oil seal is deformed, worn out or dam-
aged.
• Body seal is damaged, or the sliding
part is worn out.
• Bushing seal is damaged.
• Cavitation is being produced.
• Aeration is being produced.
• Viscosity of hydraulic oil is too low.
• Rotate in the rated direction.
• Add oil to the specified level.
• Clean the piping.
• Replace with hydraulic oil of proper viscos-
ity.
• Run at the rated RPM.
• Remove the dirt and correct the crushing.
• Retighten each joint.
• Replace with hydraulic oil of proper viscos-
ity.
• Center them again.
• Investigate the cause of frothing and cor-
rect it.
• Replace the oil seal.
• Replace with a new one.
• Replace the bushing seal.
• Clean the suction filter and the suction pip-
ing.
• Check if piping is properly screwed in.
• Replace with hydraulic oil of proper viscos-
ity.
1
TROUBLESHOOTING
5
GEAR PUMP
Remedies
5I1AQ00