SPRING LOCK COUPLING CLEANING

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1. Fabricate a cleaning tool from a 3.175 mm {0.125 in} diameter brazing rod.

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2. Cut an abrasive pad with the dimensions corresponding to the coupling size.

Coupling size

Pad size

9.52 mm {0.375 in}

25×50 mm {1×2 in}

12.7 mm {0.5 in}

25×50 mm {1×2 in}

15.8 mm {0.625 in}

25×76 mm {1×3 in}

19.0 mm {0.75 in}

25×102 mm {1×4 in}

Coupling size	Pad size
9.52 mm {0.375 in}	25×50 mm {1×2 in}
12.7 mm {0.5 in}	25×50 mm {1×2 in}
15.8 mm {0.625 in}	25×76 mm {1×3 in}
19.0 mm {0.75 in}	25×102 mm {1×4 in}

3. Assemble the pad to the tool.

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4. Coat the abrasive pad with compressor oil.

5. Roll the pad on the tool and install it in a variable speed motor drill.

6. Polish for 1 min at moderate speed (less than 1,500 rpm) or until the surface is clean and free of scratches or foreign material.

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Caution

• Maintain low speed drill rotation when inserting or removing the cleaning tool to prevent axial scratches which may cause future leaks.

7. Clean the fitting with a lint-free cloth.

8. Inspect the surface for grooves or scratches. If grooves or scratches are still present, install a new component.

9. Clean the O-ring seal grooves with a 300 mm {12 in} length of natural fiber string.

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• Loop the string around the grooves and pull the string back and forth.

10. Remove any foreign material from the grooves with a lint-free cloth.