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5-46
5
TROUBLESHOOTING
PISTON PUMP
Symptoms
Major causes
Remedies
Noise is too loud, unusual
sound is heard
• Suction hose is crushed or suction filter
is clogged
• 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
• Engine RPM is too high
• Mechanical damage to the parts (e.g.,
bearing)
• 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.
• Run at the rated RPM.
• Replace the damaged part(s) or the pump.
Discharge is insufficient
• Engine RPM is too low
• Oil temperature is too high
• Viscosity of hydraulic oil is too high
• Pump volume efficiency becomes low
• Hydraulic oil tank level is too low
• Clogging in the suction piping or the
suction filter
• Leak volume of hydraulic devices other
than the pump is increased
• Run at the rated RPM.
• Stop running, and check the temperature again
after the oil cools down.
• Replace with hydraulic oil of proper viscosity.
• Replace the pump.
• Add oil to the specified level.
• Clean the piping.
• Repair or replace the leaking hydraulic device.
Pressure is not increased • Set pressure for the relief valve drops
• Leak volume of hydraulic devices other
than the pump is increased
• Pump volume efficiency becomes low
• Set the relief valve pressure again.
• Repair or replace the leaking hydraulic device.
• Replace the pump.
Abnormal heat is gener-
ated
• Leak volume from the pump is in-
creased
• Mechanical damage to the parts (e.g.,
bearing)
• Seizing on the sliding part
• Replace the pump.
• Replace the damaged part(s) or the pump.
• Replace the damaged part(s) or the pump.
Oil leak
• Seals are damaged
• Sliding part between the shaft and the
oil seal is worn out
• Plugs and bolts are loosened
• Replace the seal(s).
• Replace the shaft or the pump.
• Retighten the plugs and bolts, or replace the
seals.
PISTON PUMP
Summary of Contents for TB 250
Page 1: ......
Page 3: ...1 1 SAFETY 1 Safety alert symbol 1 2 Safety precautions 1 3 Cautions when working 1 9...
Page 36: ...2 24 2 TIGHTENING TORQUE SERVICE DATA...
Page 38: ...2 26 2 HYDRAULIC CIRCUIT DIAGRAM SERVICE DATA Equipped with options 2 2...
Page 39: ...2 27 2 HYDRAULIC CIRCUIT DIAGRAM SERVICE DATA Equipped with angle blade and blade oat 1 2...
Page 40: ...2 28 2 HYDRAULIC CIRCUIT DIAGRAM SERVICE DATA Equipped with angle blade and blade oat 2 2...
Page 41: ...2 29 2 HYDRAULIC CIRCUIT DIAGRAM SERVICE DATA Equipped with high ow option 1 2...
Page 42: ...2 30 2 HYDRAULIC CIRCUIT DIAGRAM SERVICE DATA Equipped with high ow option 2 2...
Page 49: ......
Page 59: ...2 46 2 WIRE HARNESS WIRING DIAGRAM SERVICE DATA...
Page 60: ...2 47 2 WIRE HARNESS WIRING DIAGRAM SERVICE DATA...
Page 61: ...2 48 2 WIRE HARNESS WIRING DIAGRAM SERVICE DATA...
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Page 73: ...2 60 2 WIRE HARNESS WIRING DIAGRAM SERVICE DATA NAME STANDARD NO...
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Page 92: ...3 11 3 CONTROL VALVE FUNCTION...
Page 108: ...4 3 4 SERVICE STANDARDS DISASSEMBLY AND ASSEMBLY Clearance for pin and bushing...
Page 352: ...ENGINE 6 Machine model Mounted engine TB250 4TNV88...