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IV-9
HYDRAULIC UNITS
HST PUMP
T6D115
2
1
4
5
Charge Check and High Pressure Relief
Valve
This valve has two functions: a charge check valve
and a high-pressure relief valve. The charge check
valve function supplies the closed circuit with the
oil from the charge pump to replenish the oil flushed
into the tank by the flushing valve. The high pressure
relief valve function prevents the hydraulic circuit
from being damaged by the increased pressure due
to the oil supplied from the pump in succession and
keeps the hydraulic circuit at an appropriate pres-
sure.
Charge Check Valve
If the pressure in the charge circuit (1) becomes
higher than that in the closed circuit (2), a gap is
generated between the check valve (4) and the
spring holder (3) and so the oil flows into the closed
circuit (2).
High Pressure Relief Valve
If the pressure in the closed circuit (2) becomes
higher than the force exerted by the spring (5), the
check valve (4) is moved to the left and so the oil
flows into the charge circuit (1).
Charge Relief Valve
The charge relief valve keeps the charge supplied
from the charge pump at a steady and constant
level. The oil from the charge pump reaches as
high as chamber A. When the pressure in chamber
A increases to the point where it exceeds the force
exerted by spring (2) holding down relief valve (1),
it moves relief valve (1) and the oil runs out of the
tank.
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...