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IV-47
HYDRAULIC UNITS
CONTROL VALVE
T9D201
P
T
1
T9D202E
SECTION Z-Z
2
3
4
4
5
A
B
Z
Z
T9D203E
SECTION Z-Z
2
3
4
4
T
5
A
B
Z
Z
OPERATION
When the Spool is in the Neutral Position
When the spool is not moved (in the neutral posi-
tion), the oil supplied from the pump flows into the
valve through port P and flows via the bypass pas-
sage (1) to port T to return to the tank.
When the Spool is Moved
Arm, Bucket Section
When the pressure is applied to the pilot chamber
(3), the spool (2) is moved to the right of the neutral
position and the center bypass passage (4) is closed.
The oil that flows from the pump lifts the poppet (5)
and runs through the inner passage of the spool (2)
to port B to be supplied to the actuator.
On the other hand, the oil returned from the actuator
flows into port A, and runs through the inner passage
of the spool (2) to be supplied to the next section.
When the spool (2) is moved to the left of the neutral
position, the oil is supplied to the actuator through
port A, and the oil returned from the actuator flows
into port B.
Auxiliary Section
When the pressure is applied to the pilot chamber
(3), the spool (2) is moved to the right of the neutral
position and the center bypass passage (4) is closed.
The oil that flows from port P lifts the poppet (5) and
flows through port A to be supplied to the actuator.
On the other hand, the oil returned from the actuator
flows into port B and flows via the tank passage T to
return to the tank.
When the spool (2) is moved to the left of the neutral
position, the oil is supplied to the actuator through
port B, and the oil returned from the actuator flows
into 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...