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3-4
3
PISTON PUMP
FUNCTION
Relief valve and solenoid valve
If the oil pressure discharged from the pump P4 (2) be-
comes higher than the set value, the relief valve (1) releases
the oil into the tank circuit. In this way, the relief valve (1)
keeps the pressure in the pilot circuit constant.This pilot
pressure is turned of or off by the solenoid valve A, used
to switch the 2nd speed, and the solenoid valve B, used to
switch the lever lock.
Solenoid valve
When the solenoid valve is not energized
The oil in the port P is blocked by the spool (1).
Since the port A is connected with the port T, the pressure
in the downstream pilot circuit becomes equal to the tank
pressure.
When the solenoid valve is energized
A magnetic field is generated around the coil that causes
the plunger (2) to be pulled downward and the spool (1)
to be pushed down. In this way, the oil in the port A flows
to the port A, transferring the pressure to the downstream
pilot circuit.
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Содержание TB 250
Страница 1: ......
Страница 3: ...1 1 SAFETY 1 Safety alert symbol 1 2 Safety precautions 1 3 Cautions when working 1 9...
Страница 36: ...2 24 2 TIGHTENING TORQUE SERVICE DATA...
Страница 37: ...2 25 2 SERVICE DATA HYDRAULIC CIRCUIT DIAGRAM HYDRAULIC CIRCUIT DIAGRAM Equipped with options 1 2...
Страница 38: ...2 26 2 HYDRAULIC CIRCUIT DIAGRAM SERVICE DATA Equipped with options 2 2...
Страница 39: ...2 27 2 HYDRAULIC CIRCUIT DIAGRAM SERVICE DATA Equipped with angle blade and blade oat 1 2...
Страница 40: ...2 28 2 HYDRAULIC CIRCUIT DIAGRAM SERVICE DATA Equipped with angle blade and blade oat 2 2...
Страница 41: ...2 29 2 HYDRAULIC CIRCUIT DIAGRAM SERVICE DATA Equipped with high ow option 1 2...
Страница 42: ...2 30 2 HYDRAULIC CIRCUIT DIAGRAM SERVICE DATA Equipped with high ow option 2 2...
Страница 43: ...2 31 2 HYDRAULIC CIRCUIT DIAGRAM SERVICE DATA Equipped with high ow angle blade blade oat option 1 2...
Страница 44: ...2 32 2 HYDRAULIC CIRCUIT DIAGRAM SERVICE DATA Equipped with high ow angle blade blade oat option 2 2...
Страница 46: ...2 34 2 ELECTRIC CIRCUIT DIAGRAM SERVICE DATA First auxiliary hydraulic piping with proportional control...
Страница 49: ......
Страница 59: ...2 46 2 WIRE HARNESS WIRING DIAGRAM SERVICE DATA...
Страница 60: ...2 47 2 WIRE HARNESS WIRING DIAGRAM SERVICE DATA...
Страница 61: ...2 48 2 WIRE HARNESS WIRING DIAGRAM SERVICE DATA...
Страница 62: ...2 49 2 WIRE HARNESS WIRING DIAGRAM SERVICE DATA...
Страница 63: ...2 50 2 WIRE HARNESS WIRING DIAGRAM SERVICE DATA...
Страница 64: ...2 51 2 WIRE HARNESS WIRING DIAGRAM SERVICE DATA...
Страница 65: ...2 52 2 WIRE HARNESS WIRING DIAGRAM SERVICE DATA...
Страница 66: ...2 53 2 WIRE HARNESS WIRING DIAGRAM SERVICE DATA...
Страница 67: ...2 54 2 WIRE HARNESS WIRING DIAGRAM SERVICE DATA...
Страница 68: ...2 55 2 WIRE HARNESS WIRING DIAGRAM SERVICE DATA...
Страница 69: ...2 56 2 WIRE HARNESS WIRING DIAGRAM SERVICE DATA...
Страница 70: ...2 57 2 WIRE HARNESS WIRING DIAGRAM SERVICE DATA...
Страница 71: ...2 58 2 WIRE HARNESS WIRING DIAGRAM SERVICE DATA...
Страница 72: ...2 59 2 WIRE HARNESS WIRING DIAGRAM SERVICE DATA...
Страница 73: ...2 60 2 WIRE HARNESS WIRING DIAGRAM SERVICE DATA NAME STANDARD NO...
Страница 74: ...2 61 2 WIRE HARNESS WIRING DIAGRAM SERVICE DATA...
Страница 75: ...2 62 2 WIRE HARNESS WIRING DIAGRAM SERVICE DATA...
Страница 76: ...2 63 2 WIRE HARNESS WIRING DIAGRAM SERVICE DATA...
Страница 77: ...2 64 2 WIRE HARNESS WIRING DIAGRAM SERVICE DATA...
Страница 78: ...2 65 2 WIRE HARNESS WIRING DIAGRAM SERVICE DATA...
Страница 79: ...2 66 2 WIRE HARNESS WIRING DIAGRAM SERVICE DATA...
Страница 80: ...2 67 2 WIRE HARNESS WIRING DIAGRAM SERVICE DATA...
Страница 81: ...2 68 2 WIRE HARNESS WIRING DIAGRAM SERVICE DATA...
Страница 92: ...3 11 3 CONTROL VALVE FUNCTION...
Страница 108: ...4 3 4 SERVICE STANDARDS DISASSEMBLY AND ASSEMBLY Clearance for pin and bushing...
Страница 130: ...4 25 4 UPPER FRAME DISASSEMBLY AND ASSEMBLY 15 Side frame R 16 Side frame L 17 Tool box 18 Cover 19 Bracket 20 Cover 2 2...
Страница 165: ...4 60 4 HYDRAULIC PUMP DISASSEMBLY AND ASSEMBLY f Remove the plug g Remove the spring and the ball...
Страница 267: ...4 162 4 SLEW MOTOR DISASSEMBLY AND ASSEMBLY Special tools Oil seal press tting jig A Collar installation jig B...
Страница 352: ...ENGINE 6 Machine model Mounted engine TB250 4TNV88...