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IV-63
HYDRAULIC UNITS
CONTROL VALVE (HIGH FLOW)
TROUBLESHOOTING
Symptom
Probable Causes
Remedy
High flow does not oper-
ate.
• The high flow is unloaded (The coil or wiring is
broken.)
• A foreign matter which entered the spool of
the solenoid switching section is blocking the
switching.
• The spool does not operate.
• The spool does not operate (foreign matter en-
tered)
• Replace the coil.
• Clean or replace the spool.
• Check the pressure in the
port PL.
• Disassemble and clean, re-
pair or replace the spool.
The relief valve cannot
be unloaded.
• The solenoid coil is switched on.
• A foreign matter which entered the spool of
the solenoid switching section is blocking the
switching (the spool does not return).
• A foreign matter which entered the spool is
blocking the spool from returning.
• The plunger is malfunctioning (foreign matter
entered)
• Check the wiring.
• Disassemble and clean, re-
pair or replace the spool.
• Disassemble to identify the
cause, and repair or replace
the spool.
• Disassemble to identify the
cause, and repair or replace
the plunger.
Oil leakage from sole-
noid valve, cover, or re-
lief valve to the outside.
• Damaged O-ring
• Replace
Pressure does not rise.
• Catching of foreign matter by the relief valve
• Clean 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...