1-M3
B7800HSD (SUPPLEMENT), WSM
HYDRAULIC SYSTEM
2. RELIEF VALVE
The implement control system circuit has a relief
valve to restrict the maximum pressure in the circuit. The
relief valve is located in the control valve body.
The relief valve is of the guide piston type with
damping effect.
Among direct acting relief valves, this type is suited to
higher pressure and has large capacity. Furthermore,
this type is free from unstable operation, such as
chattering, which occurs often in direct acting relief
valves.
As shown in the figure, the guide is attached to the
poppet (5) and a valve chamber
D.C.
(called the damping
chamber) is formed at the right of the guide piston. The
inlet of the valve leads to the chamber via a clearance
between the sliding portion of the guide and the seat (6),
minimizing valve vibration with the damping effect of the
chamber.
When the oil pressure in the circuit is lower than the
setting pressure of the relief valve, the relief valve is not
operated and the oil fed to the relief valve from the
hydraulic pump flows into the implement control valve.
As the oil pressure in the circuit increases, so does
the pressure in the damping chamber
D.C.
When the
pressure rises above the valve setting and overcomes
the spring force, the valve opens. Oil then flows out to
the transmission case through
T
port, preventing any
further rise in pressure. The valve closes again when
enough oil is released to drop pressure below the valve
setting.
(Reference)
• Relief valve setting pressure: 13.2 to 14.2 MPa
135 to 145 kgf/cm
2
1920 to 2064 psi
• Engine speed: Maximum
• Oil temperature: 40 to 50
°
C
104 to 122
°
F
W1013000
(1) Plug
(2) Washer
(3) Shim
(4) Hydraulic Cylinder Body
(5) Poppet
(6) Seat
D.C.: Damping Chamber
P: Pump Port
C: Cylinder Port
T: Tank Port
KiSC issued 09, 2007 A
Summary of Contents for B2910
Page 1: ...W 0 R K HO P MAN U A L TRACTOR 82410 82710 82910...
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Page 142: ...MECHANISM CONTENTS 1 FEATURES 2 M1 2 LINKAGE MECHANISM 2 M2 3 OPERATION 2 M3...
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Page 230: ...MECHANISM CONTENTS 1 FEATURES 5 M1 2 OPERATION 5 M2...
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Page 379: ...KUBOTA Corporation OSAKA JAPAN 2 13 Bulletin No SFI A 04 015...
Page 380: ...KUBOTA Corporation OSAKA JAPAN 3 13 Bulletin No SFI A 04 015...
Page 381: ...KUBOTA Corporation OSAKA JAPAN 4 13 Bulletin No SFI A 04 015...
Page 382: ...KUBOTA Corporation OSAKA JAPAN 5 13 Bulletin No SFI A 04 015...
Page 383: ...KUBOTA Corporation OSAKA JAPAN 6 13 Bulletin No SFI A 04 015...
Page 384: ...KUBOTA Corporation OSAKA JAPAN 7 13 Bulletin No SFI A 04 015...
Page 385: ...KUBOTA Corporation OSAKA JAPAN 8 13 Bulletin No SFI A 04 015...
Page 386: ...KUBOTA Corporation OSAKA JAPAN 9 13 Bulletin No SFI A 04 015...
Page 387: ...KUBOTA Corporation OSAKA JAPAN 10 13 Bulletin No SFI A 04 015...
Page 388: ...KUBOTA Corporation OSAKA JAPAN 11 13 Bulletin No SFI A 04 015...
Page 389: ...KUBOTA Corporation OSAKA JAPAN 12 13 Bulletin No SFI A 04 015...
Page 390: ...KUBOTA Corporation OSAKA JAPAN 13 13 Bulletin No SFI A 04 015...
Page 392: ...B7800 HSD SUPPLEMENT WORKSHOP MANUAL TRACTOR KiSC issued 09 2007 A...
Page 396: ...G GENERAL KiSC issued 09 2007 A...
Page 400: ...1 HYDRAULIC SYSTEM KiSC issued 09 2007 A...
Page 415: ...2 ELECTRICAL SYSTEM KiSC issued 09 2007 A...
Page 417: ...2 M1 B7800HSD SUPPLEMENT WSM ELECTRICAL SYSTEM 1 WIRING DIAGRAM KiSC issued 09 2007 A...
Page 418: ...2 M2 B7800HSD SUPPLEMENT WSM ELECTRICAL SYSTEM KiSC issued 09 2007 A...