7-S6
MX5100, WSM
STEERING
Hydraulic Flow Test (Power Steering)
• 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
adaptors (1) (2) (3) to the pump discharge port.
2. Connect the hydraulic test hose to the adaptor 3 (3) and the
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. 2700 min
-1
(rpm)
• Rated pressure :
[2WD] 10.7 to 11.7 MPa
109 to 119 kgf/cm
2
1552 to 1697 psi
[4WD] 12.7 to 13.7 MPa
130 to 140 kgf/cm
2
1849 to 1991 psi
• Oil temperature : 40 to 60 °C (104 to 140 °F)
W1015559
Hydraulic pump delivery
at no pressure
Factory spec.
Above 18.6 L/min.
4.91 U.S.gals/min.
4.09 Imp.gals/min.
Hydraulic pump delivery
at rated pressure
Factory spec.
Above 18.17 L/min.
4.80 U.S.gals/min.
4.00 Imp.gals/min.
Allowable limit
16.17 L/min.
4.27 U.S.gals/min.
3.56 Imp.gals/min.
(1) Adaptor 1
(2) Adaptor 2
(3) Adaptor 3
(4) Hydraulic Test Hose
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