wsm Kubota L4100, Workshop Manual

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HYDRAULIC SYSTEM L4100, WSM
8-S7
(EU)
Hydraulic Flow Test (Power Steering)
IMPORTANT
• When using a flowmeter which is not specified by
KUBOTA, be sure to follow the instructions for that
flowmeter.
• Since the flowmeter has no relief valve, do not close the
flowmeter loading valve completely before testing.
1. Remove the power steering delivery pipe joint bolt 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 the 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 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 to the 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. 2600 min
-1
(rpm)
• Rated pressure:
10.7 to 11.6 MPa (109 to 119 kgf/cm
2
, 1550 to 1690 psi)
• Oil temperature:
40 to 60 °C (104 to 140 °F)
9Y1210278HYS0035US0
Hydraulic pump delivery
at no pressure
Factory specification
Above
17.9 L/min.
4.73 U.S.gals/min.
3.94 Imp.gals/min.
Hydraulic pump delivery
at rated pressure
Factory specification
Above
17.6 L/min.
4.65 U.S.gals/min.
3.87 Imp.gals/min.
Allowable limit
15.7 L/min.
4.15 U.S.gals/min.
3.45 Imp.gals/min.
KiSC issued 08, 2012 A