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IV-57
HYDRAULIC UNITS
CONTROL VALVE (HIGH FLOW)
OPERATION
When the solenoid (2) of the control valve (high
flow) (1) is powered on, the pilot pressure from the
pilot valve (3) operates the spool of the auxiliary hy-
draulic section of the control valve (4) to let the hy-
draulic oil from the pump P3 flow into the auxiliary
hydraulic (A). The pilot pressure is led to the port
PL of the control valve (high flow) (1) to operate the
spool of the switching valve (5) and to let the hy-
draulic oil from the pump PTO flow to the auxiliary
hydraulics (A). This will combine the hydraulic oil
flows from the pump P3 and the pump PTO together.
Also, the unload valve (6) of the control valve (high
flow) (1) keeps the pressure from the pump PTO
constant.
When the solenoid (2) is not powered on, the hy-
draulic oil from the pump PTO flows through the
unload valve (6) into the tank.
Switching Valve
When the Spool is in the Neutral Position:
When the spool of the control valve is not moved,
the hydraulic oil supplied from the port P flows
through the center bypass passage (C) and port P,
and returns to the tank.
When the Spool is Operating:
When the pilot pressure is led to the port PL, the
spool moves to the right to close the center bypass
passage. Then the hydraulic oil flows from the pas-
sage (D) into the port A.
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...