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IV-80
HYDRAULIC UNITS
PILOT VALVE
TROUBLESHOOTING
Symptom
Probable Causes
Remedy
Secondary pressure
doesn
·
t rise
• Primary pressure is insufficient
• Spring is damaged or permanently de-
formed
• The clearance between the spool and
casing is abnormally large
• There is looseness in the handle
• Keep the primary pressure
• Replace the spring
• Replace the spool and casing assembly
• Disassemble and reassemble, or replace
the handle
Secondary pressure
doesn
·
t stabilize
• Sliding parts are catching
• Tank line pressure fluctuates
• Air gets mixed into the piping
• Repair or replace
• Remove the abnormal portions of the
tank line
• Operate the machine several times and
bleed out the air
Secondary pressure is
high
• Tank line pressure is high
• Sliding parts are catching
• Remove the abnormal portions of the
tank line
• 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...