Sealing System Leakage Analysis - Seal
Contaminants Packed in the Seal Area
| Probable Causes | Actions or Countermeasures |
|---|---|
| Failure of auxiliary lip | Look for cut or damaged auxiliary lip. Look for auxiliary lip worn excessively. |
Below is an example of contamination cause by the failure of the auxiliary lip.
Paint Spray on Seal Lip
| Probable Causes | Actions or Countermeasures |
|---|---|
| Lack of paint mask. | Review painting procedures and recommend a mask. |
| Service or in-field paint procedure. | Issue a service bulletin to prevent paint over-spray or specify a mask. |
Check for Seal Cocking
| Probable Causes | Actions or Countermeasures |
|---|---|
| Seal installation. | Use proper installation tool. Check installation force to insure complete installation. |
| Insufficient or improper bore chamfer. | Provide proper amount and lead in angle for chamfer. |
| Excessive seal interference with rubber OD seal. | Check bore ID and seal OD for proper dimensions. |
Check for Proper Installation and Orientation Relative to Assembly
| Probable Causes | Actions or Countermeasures |
|---|---|
| Backward installation caused by lack of proper installation tool or visual aid. | Provide foolproof installation tool and/or aide to identify proper orientation. |
| Improper axial location of seal. | Provide proper installation tool. |
| Improper axial position of shaft. | Provide proper installation tool and visual aide for proper position |
Below is an illustration of a seal improperly installed backwards.
Check for OD Leakage
| Probable Causes | Actions or Countermeasures |
|---|---|
| Oversized bore/undersized seal. | Check bore and seal diameters at removal. |
| Damaged housing. | Check upon removal. |
| Damaged seal. | Check for OD damage upon removal. |
| Differential thermal expansion (Al or Mg housing). | Calculate fit at maximum temperature. |
Check for Case Deformation (Dishing or Damage)
| Probable Causes | Actions or Countermeasures |
|---|---|
| Dented heel face caused by hammer installation. | Provide proper installation tool. |
| Dished heel face caused by improper installation tool. | Provide proper installation tool. |
Below is an example of case damage most likely caused during installation.
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Power-Gen 2010 Zerelli Technologies Inc. will be exhibiting at this year's...
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Zerelli Technologies Published in the November Issue of Pumps and Systems Magazine
February 23rd
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The Skinny on Grease Compatibility
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