IV-32
HYDRAULIC UNITS
HST PUMP
Hydraulic Pump
Trouble
Probable Causes
Remedy
Noise is loud. Ab-
normal noise is
generated.
• The suction hose is pinched or the suction
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 bearing, etc. is mechanically dam-
aged.
• 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 en-
gine.
• Investigate the cause of the bubbles and
repair it.
• Operate the engine at the specified
speed.
• Replace the damaged parts or replace the
pump.
Discharge is insuf-
ficient.
• 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 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 increas-
ing.
• 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.
• Replenish the tank with hydraulic oil to
the specified level.
• Clean the piping.
• Repair the hydraulic device or replace it.
Pressure
doesn
·
t
rise.
• The relief valve setting has dropped.
• The amount of leakage from hydraulic
devices other than the pump is increas-
ing.
• The pump
·
s volumetric efficiency has
dropped.
• Reset the relief valve setting.
• Repair the hydraulic device or replace it.
• Replace the pump.
Abnormal heat is
generated.
• Leakage from the pump is increasing.
• The bearings, etc. are mechanically dam-
aged.
• There is seizing of sliding parts.
• Replace the pump.
• Replace the damaged parts or replace the
pump.
• Replace the damaged parts or replace the
pump.
Hydraulic oil is
leaking.
• Seals are damaged.
• The shaft surface which slides against the
oil seal is worn.
• The plug or bolts are loose.
• Replace the seals.
• Replace the shaft or replace the pump.
• Tighten them or replace the seals.
Содержание TL150
Страница 1: ...TL150 Track Loader BOOK No CT7E901 WORKSHOP MANUAL Serial No 21500004...
Страница 4: ...0 4...
Страница 5: ...I 1 I GENERAL...
Страница 18: ...I 14 GENERAL...
Страница 19: ...II 1 II SPECIFICATIONS...
Страница 44: ...III 1 III MACHINE CONFIGURATION...
Страница 94: ...III 51 MACHINE CONFIGURATION ELECTRICAL SYSTEM ELECTRICAL SYSTEM ELECTRICAL WIRING DIAGRAM...
Страница 122: ...III 79...
Страница 146: ...MACHINE CONFIGURATION III 103...
Страница 147: ...IV 1 IV HYDRAULIC UNITS...
Страница 152: ...IV 6 HYDRAULIC UNITS HST PUMP 1 Plug 2 Plug 3 Plug 4 Screw 5 Seal Nut 6 Plug Pump Assembly 4 4...
Страница 189: ...IV 43 HYDRAULIC UNITS GEAR PUMP INSPECTION AND ADJUSTMENT IV 36 38 TROUBLESHOOTING IV 39...
Страница 230: ...IV 84 HYDRAULIC UNITS PILOT VALVE INSPECTION AND ADJUSTMENT IV 79 TROUBLESHOOTING IV 80...
Страница 254: ...IV 108 HYDRAULIC UNITS CYLINDERS Corrective Jig E MATERIAL STKM13C Unit mm Corrective Jig E A B Arm 90 75 Bucket 90 75...
Страница 261: ...IV 115 HYDRAULIC UNITS TRAVEL MOTOR DISASSEMBLY AND ASSEMBLY Special tools...
Страница 263: ...IV 117 HYDRAULIC UNITS TRAVEL MOTOR...
Страница 282: ...IV 136 HYDRAULIC UNITS TRAVEL MOTOR...
Страница 283: ...V 1 V TROUBLESHOOTING...