【Troubleshooting】Leaking from fitting

■　Leakage from the fitting end

 (1) Symptom: The outer cover and inner tube is excessively hard and cracked.

  

Cause: There was an excessive rise in the fluid temperature or in the atmosphere temperature. Remedy: Select the appropriate hose based on the working temperature or lower the temperature by using an oil cooler.

(2) Symptom: The hose is bent to an extreme near the hose end.

Cause: Poor routing of the hose.
Remedy: Use swivel fittings or joints to prevent the hose from being bent.

(3) Symptom: The hose is twisted and deformed near the hose end.

Cause: Poor routing of hose. If the hose is twisted near the hose end, it will cause the hose to break and leak.
Remedy: Take extra care not to twist the hose when installing the hose assembly. You can also use two wrenches when installing the hose assembly to prevent it from being twisted.

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■　Leakage from sealing surface of the fitting

(1) Symptom: Over or under tightening of torque.
Cause:
Over or under tightening of torque is applied to the fitting.

Remedy:

Tighten the fitting according to the appropriate torque.

*The recommendation chart is shown in page 4 of our catalog to assist you in choosing the appropriate torque.

(2) Symptom: Foreign substance trapped into the fitting.

Cause:

The sealing surface of the fitting is contaminated and/or damaged.

Remedy: Remove the foreign substance and check to see the sealing surface is not damaged.

Take extra care not to contaminate the sealing surface.

 (3) Symptom: O-ring size is not appropriate.

Cause:

The specification and / or size of the O-ring is incorrect.

Remedy:

Use the correct O-ring for the fitting.
For more details of our O-rings, check page 82 of our catalog.