Power Steering Hydraulic Pump - Kubota M5640SU Workshop Manual

M5640SU, M5640DT-SU, WSM

[2] POWER STEERING HYDRAULIC PUMP

Hydraulic Flow Test
IMPORTANT
• When using a flowmeter other than KUBOTA specified
flowmeter (Code No. 07916-52792), be sure to use the
instructions with the flowmeter.
• Do not close the flowmeter loading valve completely,
before testing, because it has no relief valve.
1. Disconnect the delivery pipe which is connected from hydraulic
pump to steering controller.
2. Install the adaptor 53 and 54 to the pump discharge port.
[Adaptor 53 and 54 are included in adaptor set (Code No.
07916-54301).]
3. Connect the hydraulic test hose to the adaptor 53 and flowmeter
inlet port.
4. Connect the other hydraulic test hose to the flowmeter outlet
and put the end of the hose into the transmission oil port.
5. Open the flowmeter
counterclockwise.)
6. Start the engine and set the engine speed at 2000 to 2200 min
(rpm).
7. Slowly close the loading valve to generate pressure approx. 9.8
2
MPa (100 kgf/cm , 1422 psi). Hold in this condition until oil
temperature reaches approx. 50 °C (122 °F).
8. Open the loading valve completely.
9. Set the engine speed. (Refer to condition.)
10. Read and note the pump delivery at no pressure.
11. Slowly close the loading valve to increase rated pressure.
(Refer to condition.) As the load is increased, engine speed
drops, therefore, reset the engine speed.
12. Read and note the pump delivery at rated pressure.
13. Open the loading valve completely and stop the engine.
14. If the pump delivery does not reach the allowable limit, check
the pump suction line, oil filter or hydraulic pump.
Condition
• Engine speed :
-1
Approx. 2700 min (rpm)
• Rated pressure :
16.8 MPa (170 kgf/cm
• Oil temperature :
45 to 55 °C (113 to 131 °F)
Hydraulic pump delivery
Factory spec.
at no pressure
Factory spec.
Hydraulic pump delivery
at rated pressure
Allowable limit
7-S5
loading valve completely.
2
, 2418 psi)
22.6 L/min.
5.97 U.S.gals/min.
4.97 Imp. gals/min.
21.3 L/min.
5.63 U.S.gals/min.
4.69 Imp. gals/min.
17.4 L/min.
4.6 U.S.gals/min.
3.83 Imp.gals/min.
9Y1210365STS0005US0
KiSC issued 07, 2009 A
STEERING
(Turn
-1