Kubota L4400 Workshop Manual page 294

L4400 , WSM
Tractor Manuals Scotland
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.
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
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
• Rated pressure :
[2WD]
[4WD]
• Oil temperature : 40 to 60 °C (104 to 140 °F)
Hydraulic pump delivery
at no pressure
Hydraulic pump delivery
at rated pressure
Tractor Manuals Scotland - Please Do Not Copy
7-S6
2
, 1422 psi). Hold in this condition until oil
-1
(rpm)
8.0 to 9.0 MPa
2
81.4 to 91.4 kgf/cm
1158 to 1300 psi
10.7 to 11.7 MPa
2
109 to 119 kgf/cm
1552 to 1697 psi
Above 17.9 L/min.
Factory spec.
Above 17.6 L/min.
Factory spec.
15.7 L/min.
Allowable limit 4.15 U.S.gals/min.
3.45 Imp.gals/min.
STEERING
(Turn
-
4.73 U.S.gals/min.
3.94 Imp.gals/min.
4.65 U.S.gals/min.
3.87 Imp.gals/min.
W1015559
KiSC issued 07, 2007 A