HYDRAULIC SYSTEM
L3560, L4060, L4760, L5060, L5460, L6060, WSM
8-S9
[2] HYDRAULIC PUMP (FOR THREE POINT HITCH)
(1) Pump Test Using Flow-meter
Preparation
1. Pull down the knob and open the bonnet.
2. Remove the side skirt R.H..
3. Remove the main delivery pipe (1).
(When reassembling)
• Install the copper washers firmly.
9Y1210824HYS0006US0
Hydraulic Flow Test
• 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. Install the pump adaptor (see page G-68) with O-ring to the
pump discharge port.
2. Connect the hydraulic test hose to the adaptor 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.
14.7 MPa (150 kgf/cm
2
, 2133 psi). Hold in this condition until oil
temperature reached approx. 40 °C (104 °F)
7. Open the loading valve completely.
8. Refer to "Condition" below to set the engine speed.
9. Read and note the pump delivery at no pressure.
10. Slowly close the loading valve to increase (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) (Manual Transmission and GST)
Approx. 2600 min
-1
(rpm) (HST)
• Rated pressure
L3560
17.1 to 18.1 MPa (175 to 184 kgf/cm
2
, 2480 to 2620 psi)
L4060, L4760, L5060, L5460, L6060
18.1 to 19.1 MPa (185 to 194 kgf/cm
2
, 2630 to 2770 psi)
• Oil Temperature
40 to 60 °C (104 to 140 °F)
(To be continued)
Tightening torque Main delivery pipe joint bolt
49 to 54 N·m
5.0 to 5.6 kgf·m
37 to 40 lbf·ft
(1) Main Delivery Pipe
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