Kubota B1620 Workshop Manual

HYDRAULIC SYSTEM
B1220, B1620, B1820, WSM
8-S7
(EU)
(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
-1
(rpm). [Only B1220]
6. Start the engine and set the engine speed at approx. 2800 min
-1
(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.
Condition
[B1220]
• Engine speed
Approx. 3100 min
-1
(rpm)
• Oil temperature
45 to 55 °C (113 to 131 °F)
[B1620 and B1820]
• Engine speed
Approx. 2800 min
-1
(rpm)
• Oil temperature
45 to 55 °C (113 to 131 °F)
9Y1210272HYS0007US0
Relief valve setting
pressure
Factory
specifica-
tion
B1220
9.40 to 10.2 MPa
95.9 to 104 kgf/cm
2
1370 to 1470 psi
B1620 and
B1820
11.5 to 12.3 MPa
118 to 125 kgf/cm
2
1670 to 1780psi
(1) Check Port (Plug)
(2) Adjusting Plug
(3) Spring
(4) Poppet
(5) Valve Body
KiSC issued 07, 2011 A

Kubota B1620 Specifications

General

Engine Type	Diesel
Cylinders	3
Fuel Type	Diesel
Hydraulic System Type	Open center
Drive	4WD
3-Point Hitch Category	Category I