wsm L3301 - Page 516

STEERING
L3301, L3901, L4701, WSM
7-S7
Hydraulic Flow Test
IMPORTANT
• 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. Remove the power steering delivery pipe or delivery hose joint
bolt and install the pump adaptor 2 to the pump discharge port.
2. Connect the hydraulic test hose to the pump adaptor 2 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.
9.81 MPa (100 kgf/cm
2
, 1420 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 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.
(When reassembling)
• Install the copper washers firmly.
Condition
• Engine speed:
[L3301/L3901]
approx. 2700 min
-1
(rpm)
[L4701]
approx. 2600 min
-1
(rpm)
• Rated pressure:
[L3301/L3901]
11.1 to 12.0 MPa (113 to 123 kgf/cm
2
, 1640 to 1740 psi)
[L4701]
10.7 to 11.7 MPa (109 to 119 kgf/cm
2
, 1552 to 1697 psi)
• Oil temperature:
40 to 60 °C (104 to 140 °F)
(To be continued)
Tightening torque
Power steering delivery
pipe joint bolt
49 to 68 N·m
5.0 to 7.0 kgf·m
37 to 50 lbf·ft
Power steering delivery
hose joint bolt
49.0 to 58.8 N·m
5.0 to 6.0 kgf·m
37 to 43 lbf·ft
[A] L3301/L3901
[B] L4701
KiSC issued 09, 2016 A