Charge Relief Valve; Check And High Pressure Relief Valve; Neutral Valve - Kubota B2410 Workshop Manual

82410 • 82710 • 82910 WSM, 12271
3 TRANSMISSION
Oil temperature Valve operating pressure
500 to 800 kPa
50
'c
(122 'F)
5.1 to 8.2 kgf/cm
2
73 to 116 psi
While pumped and filtered oil flows into the main oil
circuit through the check and high pressure relief valves,
and excessive oil passes to the housing through the
charge relief valve.
• Charge Relief Valve
12010F30050
J
(1) Plug
(2) Spring
(3) Charge Relief Poppet
12270M30030
• Check and High Pressure Relief Valve
)
12010F30060
CD
® ®
o
The check and high pressure relief valves monitor the
oil pressure in each line of the main oil circuit.
In neutral, both valves are open and charging oil
enters into the main oil circuit through the valves.
At normal operation, the check valve in the high
pressure side is closed and it pushes and opens the
another one.
When excessively high pressure is built up in one
line, the high pressure relief valve located in this line is
open and the oil flows into another line.
Oil temperature Valve operating pressure
30.9 to 31.9 MPa
50 'C (122 'F)
315 to 325 kgf/cm
2
4480 to 4622 psi
(1) Check Valve Seat
(2) Relief Poppet
(3) Relief Spring
(4) Check Spring
12270M30040
• Neutral Valve
12270F30110
The neutral valves in the main oil circuit lines are
open and pass the oil to the case when in neutral, and
the oil pressure in their lines becomes low. And when
the oil pressure in the high pressure line increases to a
specified pressure, the neutral valve closes.
Oil temperature Valve operating pressure
7.36 to 9.81 MPa
Close
75 to 100 kgf/cm
2
50 'C (122 'F)
1067 to 1422 psi
1.47 to 2.45 MPa
Open 15 to 25 kgf/cm
2
213 to 356 psi
(1) Neutral Valve
12270M30050
3-M7