Unload Valve Measurement Method; Unload Valve Adjustment - Kubota KX080-3 Workshop Manual

WSM KX080-3 Service
f. Unload valve
1)
4)
4)
3) 2)
3)
2)
1)
IV-S-43
(Measurement method)
1. Set the pressure gauge to the coupler at the main
pump discharge side. Or remove the plug off the
main pump discharge side and set the pressure
gauge there.
2. Start the engine and run it at the maximun speed.
3. Measure the unload valve pressure. At this mea-
surement, all control levers should be at neutral
position.
4. Take 2 or 3 measurements to have their respec-
tion exact readings.
5. Hydraulic oil and temperature are as follows.
oil :ISO VG46
Temp. :50 ± 5 °C, 122 ± 9°F
• Adjustment
If the measured pressure is lower than specifica-
tion, screw in the set screw.
And vice-versa.
Reference value : See Specifications
1) Primary pilot pressure port
2) Pump 1 pressure port
3) Pump 2 pressure port
4) Pump 3 pressure port
1) LS unload valve
2) LS main relief valve
3) 4) Travel main relief valve
Hydraulic system