7-S5
L3130 · L3430 · L3830 · L4630 · L5030, WSM
STEERING
Hydraulic Flow Test
• When using a flowmeter other than KUBOTA specified
flowmeter, be sure to use the instructions with that
flowmeter.
• Do not close the flowmeter loading valve completely, before
testing, because it has no relief valve.
1. Loosen the GST/PTO delivery pipe and install the adaptor 52 to
the pump discharge port.
2. Connect the hydraulic test hose to the adaptor 52 and flowmeter
inlet port.
3. Connect the other hydraulic test hose to the flowmeter outlet port
and to transmission fluid filling plug hole.
4. Open the flowmeter loading valve completely. (Turn
counterclockwise.)
5. Start the engine and set the engine speed at 2000 to 2200
min
−1
(rpm).
6. Slowly close the loading valve to generate pressure approx. 9.8
MPa (100 kgf/cm
2
, 1422 psi). Hold in this condition until oil
temperature reaches approx. 40 °C (104 °F).
7. Open the loading valve completely.
8. Set the engine speed. (Refer to Condition.)
9. Read and note the pump delivery at no pressure.
10.Slowly close the loading valve to increase pressure (Rated
pressure). As the load is increased, engine speed drops,
therefore, reset the engine speed.
11.Read and note the pump delivery at rated pressure.
12.Open the loading valve completely and stop the engine.
13.If the pump delivery does not reach the allowable limit, check the
pump suction line, oil filter or hydraulic pump.
Condition
• Engine Speed.....Approx. 2700 min
−1
(rpm)
• Rated pressure
L3130, L3430, L3830 .... 10.7 to 11.7 MPa
109.1 to 119.3 kgf/cm
2
1552 to 1697 psi
L4630, L5030 ................ 12.7 to 13.7 MPa
129.5 to 139.7 kgf/cm
2
1842 to 1987 psi
• Oil Temperature ............ 40 to 60 °C
104 to 140 °F
W10128770
Hydraulic pump delivery
at no pressure
Factory spec.
Above 18.6 L/min.
4.91 U.S.gals/min.
4.09 lmp.gals/min.
Hydraulic pump delivery
at rated pressure
Factory spec.
Above 18.2 L/min.
4.81 U.S.gals/min.
4.00 lmp.gals/min.
Allowable limit
16.2 L/min.
4.28 U.S.gals/min.
3.56 lmp.gals/min.
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