![background image](http://html1.mh-extra.com/html/takeuchi/tl150/tl150_workshop-manual_3333853177.webp)
IV-31
HYDRAULIC UNITS
HST PUMP
TROUBLESHOOTING
HST System
Sympotom
Probable Causes
Remedy
Difficult or impos-
sible to find neutral
position.
• Pilot valve out of line.
• HST pump adjustment screws have been
improperly or insufficiently tightened.
• Repair or replace.
• Tighten or loosen the HST pump adjust-
ment screws to readjust the neutral posi-
tion. Replace the HST pump if the ad-
justment cannot be performed properly.
Machine can only
operate in forward
or reverse.
• Bad pilot valve.
• Insufficient pressure being supplied to
pilot valve.
• Insufficient charge pressure.
• Orifice plugged.
• Bad high-pressure relief valve.
• Pilot spool has been nicked or burned.
• Bad travel motor.
• Repair or replace .
• Check the gear pump P4 and the (sub)
control valve; repair or replace.
• Check the gear pump P4, the (sub) control
valve, and the low-pressure relief valve;
repair or replace.
• Clean
• Repair or replace.
• Repair or replace.
• Repair or replace.
Machine operates
neither in forward
nor reverse.
Fails to move in a
straight line in for-
ward.
• The level in the hydraulic tank is low.
• Bad pilot valve.
• Insufficient pressure being supplied to
pilot valve.
• Insufficient charge pressure.
• Orifice plugged.
• Bad high-pressure relief valve.
• Pilot spool has been nicked or burned.
• Bad travel motor.
• Fill up the tank with hydraulic oil to the
required level.
• Repair or replace.
• Check the gear pump P4 and the (sub)
control valve; repair or replace.
• Check the gear pump P4, the (sub) control
valve, and the low-pressure relief valve;
repair or replace.
• Clean
• Repair or replace.
• Repair or replace.
• Repair or replace.
System is overheat-
ing during opera-
tion.
• The level in the hydraulic tank is low.
• Bad oil cooler.
• Bad high-pressure relief valve.
• Release pressure for parking brake is too
low.
• Travel motor overheated.
• HST pump overheated.
• Fill up the tank with hydraulic oil to the
required level.
• Repair or replace.
• Repair or replace.
• Check the gear pump P4 and the (sub)
control valve; repair or replace.
• Repair or replace.
• Repair or replace.
Summary of Contents for TL150
Page 1: ...TL150 Track Loader BOOK No CT7E901 WORKSHOP MANUAL Serial No 21500004...
Page 4: ...0 4...
Page 5: ...I 1 I GENERAL...
Page 18: ...I 14 GENERAL...
Page 19: ...II 1 II SPECIFICATIONS...
Page 44: ...III 1 III MACHINE CONFIGURATION...
Page 94: ...III 51 MACHINE CONFIGURATION ELECTRICAL SYSTEM ELECTRICAL SYSTEM ELECTRICAL WIRING DIAGRAM...
Page 122: ...III 79...
Page 146: ...MACHINE CONFIGURATION III 103...
Page 147: ...IV 1 IV HYDRAULIC UNITS...
Page 152: ...IV 6 HYDRAULIC UNITS HST PUMP 1 Plug 2 Plug 3 Plug 4 Screw 5 Seal Nut 6 Plug Pump Assembly 4 4...
Page 189: ...IV 43 HYDRAULIC UNITS GEAR PUMP INSPECTION AND ADJUSTMENT IV 36 38 TROUBLESHOOTING IV 39...
Page 230: ...IV 84 HYDRAULIC UNITS PILOT VALVE INSPECTION AND ADJUSTMENT IV 79 TROUBLESHOOTING IV 80...
Page 261: ...IV 115 HYDRAULIC UNITS TRAVEL MOTOR DISASSEMBLY AND ASSEMBLY Special tools...
Page 263: ...IV 117 HYDRAULIC UNITS TRAVEL MOTOR...
Page 282: ...IV 136 HYDRAULIC UNITS TRAVEL MOTOR...
Page 283: ...V 1 V TROUBLESHOOTING...