HYDRAULIC UNITS
HYDRAULIC PUMP
IV-33
TB53FR
TROUBLESHOOTING
Symptom
Probable Causes
Remedy
• Remove the dirt or eliminate the pinched
condition of the hose.
• Retighten each joint.
• Replace the hydraulic oil with oil of the
proper viscosity.
• Center the pump with respect to the
engine.
• Investigate the cause of the bubbles and
repair it.
• Operate the engine at the specified speed.
• Check and replace the drain piping.
• Replace the damaged parts or replace
the pump.
Noise is loud. Abnormal
noise is generated.
• The suction hose is pinched or the suc-
tion filter is clogged.
• The suction side joint is loose and air is
being sucked in.
• The hydraulic oil’s viscosity is too high
and cavitation is occurring.
• The pump is off center with respect to
the engine.
• There are bubbles in the hydraulic oil.
• The engine’s speed is higher than the
specified speed.
• The drain back pressure is higher than
the specified pressure.
• The bearing, etc. is mechanically dam-
aged.
• The engine’s speed is too low.
• The oil temperature is abnormally high.
• The hydraulic oil’s viscosity is too high.
• The pump’s volumetric efficiency has
dropped.
• The horsepower setting adjustment
screw is loose.
• The oil level in the tank is low.
• The suction side pipe or the suction
filter is clogged.
• The amount of leakage from hydraulic
devices other than the pump is increasing.
• Operate the engine at the specified speed.
• Stop the machine and let the oil cool off,
then check again.
• Replace the hydraulic oil with oil of the
proper viscosity.
• Replace the pump.
• Reset the screw and lock it.
• Replenish the tank with hydraulic oil to
the specified level.
• Clean the piping.
• Repair the hydraulic device or replace
it.
• The relief valve setting has dropped.
• The amount of leakage from hydraulic
devices other than the pump is increasing.
• The pump’s volumetric efficiency has
dropped.
• The peak pressure is generated due to a
drop in the relief valve’s response.
• There is foreign matter trapped in the
pilot line or foreign matter is caught in
the sliding parts of the control equip-
ment.
• Leakage from the pump is increasing.
• The bearings, etc. are mechanically dam-
aged.
• There is seizing of sliding parts.
• Seals are damaged.
• The shaft surface which slides against
the oil seal is worn.
• The plug or bolts are loose.
• Reset the relief valve setting.
• Repair the hydraulic device or replace
it.
• Replace the pump.
• Repair the relief valve or replace it.
• Remove the foreign matter and repair or
replace the scratched parts.
• Replace the pump.
• Replace the damaged parts or replace
the pump.
• Replace the damaged parts or replace
the pump.
• Replace the seals.
• Replace the shaft or replace the pump.
• Tighten them or replace the seals.
Discharge is insufficient.
Pressure doesn’t rise.
The rotational speed drops
when there is a dynamic
load.
Abnormal heat is gener-
ated.
Hydraulic oil is leaking.
Summary of Contents for TB53FR
Page 1: ...0 1 TB53FR...
Page 2: ...0 2 TB53FR...
Page 3: ...0 3 TB53FR...
Page 6: ...0 6 TB53FR...
Page 8: ...0 8 TB53FR...
Page 9: ...I 1 TB53FR I GENERAL...
Page 24: ...GENERAL I 16 TB53FR...
Page 25: ...I 17 TB53FR II SPECIFICATIONS II 1...
Page 53: ...II 29 TB53FR III MACHINE CONFIGURATION III 1...
Page 60: ...MACHINE CONFIGURATION DRIVE SYSTEM III 8 TB53FR...
Page 68: ...MACHINE CONFIGURATION TRAVEL SYSTEM III 16 TB53FR...
Page 74: ...MACHINE CONFIGURATION UPPER FRAME III 22 TB53FR...
Page 80: ...MACHINE CONFIGURATION CONTROL SYSTEM III 28 TB53FR...
Page 86: ...MACHINE CONFIGURATION ATTACHMENTS III 34 TB53FR...
Page 88: ...III 36 TB53FR HYDRAULIC SYSTEM MACHINE CONFIGURATION...
Page 92: ...TB53FR MACHINE CONFIGURATION ELECTRICAL SYSTEM III 40...
Page 94: ...MACHINE CONFIGURATION ELECTRICAL SYSTEM III 42 TB53FR...
Page 110: ...MACHINE CONFIGURATION INTERFERENCE PREVENTION SYSTEM III 58 TB53FR...
Page 111: ...III 59 TB53FR IV HYDRAULIC UNITS IV 1...
Page 144: ...HYDRAULIC UNITS HYDRAULIC PUMP IV 34 TB53FR...
Page 166: ...HYDRAULIC UNITS CONTROL VALVE IV 56 TB53FR...
Page 186: ...HYDRAULIC UNITS PILOT VALVE IV 76 TB53FR INSPECTION AND ADJUSTMENT IV 71 TROUBLESHOOTING IV 72...
Page 267: ...IV 157 TB53FR V TROUBLESHOOTING V 1...
Page 313: ...V 47 TB53FR VI ENGINE...
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