Kubota U48-4 U55-4 Refrigerant Pressure Switch Test Check

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Here is an instruction show you guide how to check and test refrigerant pressure switch for Kubota U48-4 and U55-4 excavator.

 

Preparations:

2022 Kubota Takeuchi Diagmaster v22.08.01 v4.1.2 Software Free Download
Kubota DST-i Diagnostic Adapter

Kubota EPC Spare Parts Catalogue 2021.06 Download

 

Procedures:

When a pressure switch (inside the high-pressure/low-pressure switch) is operating normally, electricity is conducted (ON) and when an abnormal pressure occurs, it trips the switch, blocking the electricity (OFF).

Manifold gauge connections
1 Close the HI (high-pressure side) valve (3) and the LO (low-pressure side) valve (2) of the manifold gauge (1) securely.
2 Connect the red charging hose (4) to the HI (high-pressure side) charge valve (1) and the blue charging hose (5) to the LO (low-pressure side) charge valve (2).
3 Open the manifold gauge

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