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V-11
TROUBLESHOOTING
MACHINE TRAVEL
1. Inspect the pilot valve.
Measure the secondary pressure of the pilot
valve.
a. Disconnect the hose connecting the HST
pump (P1, P2) and the pilot valve at the
pump.
b. Fit a pressure gauge to the hose.
c. Engage the travel lever and measure the pres-
sure.
• The pilot valve is working properly if pres-
sure varies from 0 to 3.1 MPa in accordance
with movement of the angle of the travel le-
ver.
2. Inspect the charge pressure.
“II. Specifications, Standards for Judging
Performance”
3. Inspect the output pressure of the HST
pump.
“II. Specifications, Standards for Judging
Performance”
4. Perform replacement test for the high pres-
sure relief valves.
Since it is highly unlikely that all four high pres-
sure relief valves to fail simultaneously, it is
possible to replace them one by one to test that
they are individually functioning.
• If the motor begins to run normally after a
valve has been replaced, then you may as-
sume that the valve in place before the test
replacement is at fault.
5. HST pump fault.
“IV. Hydraulic Units, Hydraulic pump”
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...