TROUBLESHOOTING
PISTON PUMP
1
5
PISTON PUMP
5I0AQ00
PISTON PUMP
Symptoms
Major causes
Remedies
Noise is too loud, unusual
sound is heard
• Suction hose is crushed or suction filter
is clogged.
• 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.
• Engine RPM is too high.
• Run at the rated RPM.
• Mechanical damage to the parts (e.g.,
bearing).
• Replace the damaged part(s) or the pump.
Discharge is insufficient
• Engine RPM is too low.
• Run at the rated RPM.
• Oil temperature is too high.
• Stop running, and check the temperature
again after the oil cools down.
• Viscosity of hydraulic oil is too high.
• Replace with hydraulic oil of proper viscos-
ity.
• Pump volume efficiency becomes low. • Replace the pump.
• 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.
• Leak volume of hydraulic devices other
than the pump is increased.
• Repair or replace the leaking hydraulic de-
vice.
Pressure is not increased • Set pressure for the relief valve drops. • Set the relief valve pressure again.
• Leak volume of hydraulic devices other
than the pump is increased.
• Repair or replace the leaking hydraulic de-
vice.
• Pump volume efficiency becomes low. • Replace the pump.
Abnormal heat is generat-
ed
• Leak volume from the pump is in-
creased.
• Replace the pump.
• Mechanical damage to the parts (e.g.,
bearing).
• Replace the damaged part(s) or the pump.
• Seizing on the sliding part.
• Replace the damaged part(s) or the pump.
Oil leak
• Seals are damaged.
• Replace the seal(s).
• Sliding part between the shaft and the
oil seal is worn out.
• Replace the shaft or the pump.
• Plugs and bolts are loosened.
• Retighten the plugs and bolts, or replace
the seals.
Summary of Contents for TB215R
Page 1: ...CC8E005 WETB215R_A XI Seral No 215000003...
Page 3: ...SAFETY 1...
Page 13: ...SERVICE DATA 2...
Page 16: ...SERVICE DATA DIMENSIONAL DRAWING 3 2 DIMENSIONAL DRAWING 2A0AX001 Operating range 2A0AX02...
Page 53: ...SERVICE DATA WIRE HARNESS DIAGRAM 2 2 WIRE HARNESS DIAGRAM 2H0AX00 Body harness 03342 68000...
Page 54: ...SERVICE DATA WIRE HARNESS DIAGRAM 3 2 WIRE HARNESS DIAGRAM 2H0AX00...
Page 55: ...SERVICE DATA WIRE HARNESS DIAGRAM 4 2 WIRE HARNESS DIAGRAM 2H0AX00...
Page 56: ...SERVICE DATA WIRE HARNESS DIAGRAM 5 2 WIRE HARNESS DIAGRAM 2H0AX00...
Page 57: ...SERVICE DATA WIRE HARNESS DIAGRAM 6 2 WIRE HARNESS DIAGRAM 2H0AX00...
Page 58: ...FUNCTION 3...
Page 88: ...DISASSEMBLY AND ASSEMBLY 4...
Page 125: ...DISASSEMBLY AND ASSEMBLY OPERATING DEVICE 6 4 OPERATING DEVICE 4F0AX00 Hydraulic piping...
Page 230: ......
Page 232: ...TROUBLESHOOTING 5...
Page 287: ...Other 6...