8-S6
L3130 · L3430 · L3830 · L4630 · L5030, WSM
HYDRAULIC SYSTEM
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. Install the pump adaptor (see page G-54) with O-ring to the pump
discharge port.
2. Connect the hydraulic test hose to the adaptor 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
counterclockwises.)
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. 14.7
MPa (150 kgf/cm
2
, 2133 psi). Hold in this condition until oil
temperature reached 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 (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 .... 17.1 to 18.1 MPa
174.4 to 184.6 kgf/cm
2
2480 to 2625 psi
L4630, L5030 ................ 18.1 to 19.1 MPa
184.6 to 194.8 kgf/cm
2
2625 to 2770 psi
• Oil Temperature ............ 40 to 60 °C
104 to 140 °F
W10187910
A : Manual and Glide Shift
Transmission
B : Hydrostatic Transmission
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