Overload Relief Valve Measurement Method; Overload Relief Valve Adjustment - Kubota KX080-3 Workshop Manual

WSM KX080-3 Service
g. Overload relief valve
• Measurement method
1)
4)
3)
2)
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. Raise the pressure setting of the main relief
valve about 0.98 MPa (10 kgf/cm
that of the overload relief valve.
3. Run the engine at 1500 rpm. Move the levers to
get the overload relief valve activated. Measure
the pressure setting.
4. Take 2 or 3 measurements to have the exact
reading.
Reference value : See Specifications
1) Primary pilot pressure port
2) Pump 1 pressure port
3) Pump 2 pressure port
4) Pump 3 pressure port
(Adjustment of the overload relief valve)
1. Loosen the lock nut of the overload relief
valve. Using a hex wrench, turn the adjust-
ing screw to reach the specified setting.
Then tighten up the lock nut.
2. Run the engine at the 1500rpm speed.
Move the levers and make sure the pres-
sure setting.
IV-S-44
Hydraulic system
2,
142 psi) over