Relief Valve - Kubota B1220 Workshop Manual

B1220, B1620, B1820, WSM

(2) Relief Valve

Relief Valve Steering Pressure
1. Remove the seat under cover.
2. Remove the plug (R 1/16) (1) from the hydraulic cylinder case.
3. Install the adaptor (R 1/16). Then connect the cable and the
pressure gauge to the adaptor (R 1/16.)
4. Remove the feed back rod lock nut.
5. Start the engine and set the engine speed at approx. 3100 min
(rpm). [Only B1220]
6. Start the engine and set the engine speed at approx. 2800 min
(rpm). [Except B1220].
7. Move the hydraulic control lever all way up to operate the relief
valve and measure the pressure.
8. If the pressure is not within the factory specifications, remove
the hydraulic cylinder assembly (Refer to 8-S9) and adjust with
the adjusting plug (2).
9. Reinstall the hydraulic cylinder assembly. After checking the
pressure, be sure to stake the adjusting plug and control valve
body with a punch and reinstall the feedback rod interlocker
correctly.
Factory
Relief valve setting
specifica-
pressure
tion
Condition
[B1220]
• Engine speed
-1
Approx. 3100 min (rpm)
• Oil temperature
45 to 55 °C (113 to 131 °F)
[B1620 and B1820]
• Engine speed
-1
Approx. 2800 min (rpm)
• Oil temperature
45 to 55 °C (113 to 131 °F)
(1) Check Port (Plug)
(2) Adjusting Plug
(3) Spring
8-S7
HYDRAULIC SYSTEM
9.40 to 10.2 MPa
B1220 95.9 to 104 kgf/cm
1370 to 1470 psi
11.5 to 12.3 MPa
B1620 and
118 to 125 kgf/cm
B1820
1670 to 1780psi
(4) Poppet
(5) Valve Body
9Y1210272HYS0007US0
KiSC issued 07, 2011 A
-1
-1
2
2
(EU)