Kubota L4701 High Pressure Relief Valve Pressure Checking

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Here show guide on how to check high pressure relief valve pressure for Kubota L4701 excavator.

 

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Procedures:

When checking, park the machine on flat ground, apply the parking brake.
1 Remove the hex. socket head plug from P1 or P2 port. (P2 is for forward and P1 is for reverse.)
2 Assemble adaptor C (07916-50371) and threaded joint (07916-50341) with the gasket between them.
3 Install the assemble adaptor C and threaded joint to P2 (forward) or P1 (reverse) port.
4 Install the cable, threaded joint in relief valve set pressure tester and high pressure gauge to threaded joint in order.
5 Check to see that parking brake is applied.
6 Operate the engine at maximum speed.
7. Place the range gear shift lever in H position.
8 Depress the HST pedal, and measure the check and high pressure relief valve pressure.
9 If the measurement is not within the factory specification, check the check and high pressure relief valve assembly.

Check and high relief pressure
(Oil temperature at 40 to 60 °C (104 to 140 °F))

33.4 to 36.3 MPa
340.0 to 370.0 kgf/cm2
4836 to 5263 psi

 

IMPORTANT
• Measure quickly so that the relief valve may not be in operation more than 10 seconds.
NOTE
• Be sure to use high pressure gauge with over 40 MPa (400 kgf/cm2, 5800 psi).

(When reassembling)
• Install the hex. socket head plug to the port with O-ring

 

More repair case for Kubota,please refer to:Kubota Trouble Repair

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