| Radial Shaft Seal Catalog |  |
IMAGES OF SEAL FAILURES |
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Figure 1: Area D, see text
3.1.1.
Damage to the rubberised press fit with furrowing due to the sharp-edged fitting chamfer of the housing, to the chamfer angle being too steep or to blow holes in the housing bore.
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Figure 2: Area A, see text
3.1.1.2.
Mechanical damage to the sealing edge of a radial shaft seal made of NBR, made during fitting or removal.
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Figure 3: Area A, see text
3.1.2.2.
Hole in the running track of a radial shaft seal made of FKM, made by mechanical damage during removal. Refer also to Figures 4 to 7 below
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Figure 4: Area A, see text
3.1.2.2.
Mechanical damage to the sealing edge during fitting or removal of the radial shaft seal, presumably due to a sharp-edged chamfer.
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Figure 5: Area A, see text
3.1.2.2.
Mechanical damage to the sealing edge during removal of the NBR radial shaft seal with sharp-edged object (for example, screwdriver).
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Figure 6: Area A, see text
3.1.2.2.
Damage to the sealing edge during removal of the FKM radial shaft seal.
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Figure 7: Area A and B see text
3.1.2.2.
Local mechanical damage to the sealing lip during fitting or removal caused by a keyway in the shaft.
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Figure 8: Area A, see text
3.2.1.2.
Breaking-away of the elastomer in the sealing edge of a FKM radial shaft seal caused by excessive thermal stress of the elastomer resulting from lack of lubrication. Refer also to Figure 9 below
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Figure 9: Area A, see text
3.2.1.2.
Severe wear of the sealing edge of the radial shaft seal due to the shaft being too rough.
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Figure 10: Area A, see text
3.2.2.1. and 3.2.2.2.
Chemical etching of the sealing edge of a NBR radial shaft seal by a synthetic oil based on polyglycol, occurring after a 200 hours running time. Refer also to Figures 11 to 13 below |
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Figure 11: Area A, see text
3.2.2.1. and 3.2.2.2.
Chemical etching and severe deposition at the sealing edge of a NBR radial shaft seal by a synthetic oil based on polyglycol and containing a high level of additives.
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Figure 12: Area A, see text
3.2.2.1. and 3.2.2.2.
The sealing edge of a NBR radial shaft seal attacked by chemicals. Use of a vacuum pump greased with "Framblin". Chemical attack probably caused by cleaning agent.
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Figure 13: Area A and B, see
text 3.2.2.1. and 3.2.2.2.
Holes in the running track of a FKM radial shaft seal caused by chemical etching of the elastomer due to the high level of additives in the oil. Deposits between the helical flights.
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Figure 14: Area A, see text
3.2.2.3.
Severe circumferential furrows in the running track of the radial shaft seal due to deposits on the shaft.
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Figure 15: Area A, see text
3.2.2.4. and 3.2.4.1.
Oil deposits at the sealing lip with axial cracks due to thermal overloading of the oil and the elastomer. Refer also to Figures 16 to 23 below
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Figure 16: Area A, see text
3.2.2.4.
Oil carbon adhering to sealing lip of a FKM radial shaft seal due to excessive thermal stress on the oil.
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Figure 17: Area A, see text
3.2.2.4. and 3.2.4.1.
Start of the formation of oil carbon and axial cracking at the sealing edge of the radial shaft seal due to thermal overloading of the oil and the elastomer.
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Figure 18: Area A, see text
3.2.2.4. and 3.2.4.1.
Deposits of oil carbon and severe axial furrowing at the sealing lip due to thermal overloading of the oil and the elastomer. Refer also to Figures 36 and 37 below
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Figure 19: Area A, see text
3.2.2.4.
Damage to the sealing edge of a FKM radial shaft seal due to deposits of oil carbon in the region of the sealing lip, resulting from the oil temperature being too high.
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Figure 20: Area A, see text
3.2.2.4.
Formation of oil carbon in the early stages caused by thermal overloading of the oil.
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Figure 21: Area A, see text
3.2.2.4.
Oil carbon at the sealing edge caused by thermal overloading of the oil, and breaking-away of the elastomer caused by the chemical attack of an oil with a high level of additives.
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Figure 22: Area B, see text
3.2.2.4.
Detachable oil carbon between the helical flights of the radial shaft seal in the vicinity of the sealing edge, caused by thermal overloading of the oil.
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Figure 23: Area B, see text
3.2.2.4.
Deposits between the runout at the helices of a radial shaft seal due to thermal overloading of the grease between the sealing lip and the dust lip. The deposits are the grease residues after leaching of the grease. In addition, there is water entry from the back face.
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Figure 24: Area A, see text
3.2.2.5.
Rough running track with break-away of small sections of the FKM radial shaft seal, caused by lack of lubrication of the assembly. Refer also to Figures 25 and 26 below |
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Figure 25: Area A, see text
3.2.2.5.
Rough running track of the FKM radial shaft seal caused by lack of lubrication during the running-in of the assembly.
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Figure 26: Area A, see text
3.2.2.5.
Severe abrasion of the elastomer at the sealing edge of a FKM radial shaft seal due to dry running.
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Figure 27: Area A, see the text
3.2.3.1.
Circumferential helical-shaped furrows in the running track of the radial shaft seal caused by dirt particles under the sealing edge. Refer also to Figures 28 to 33 below
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Figure 28: Area B, see the text
3.2.3.1.
Mixture of grease, leakage and rubber debris between the helical flights of a FKM radial shaft seal.
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Figure 29: Area B, see text
3.2.3.1.
Dirt deposits (dust, sand) between the runout at the helices caused by penetration of dirt from the back face of the radial shaft seal.
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Figure 30: Area A, see text
3.2.3.1.
Local raised deposits on the running track caused by the start of thermal overloading of the oil.
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Figure 31: Area A, see text
3.2.3.1.
Deposits in figure 30 scraped off.
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Figure 32: Areas A and B, see text
3.2.3.1.
Dirt and elastomer abrasion in the region of the sealing lip caused by contamination of the oil and dirt from outside.
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Figure 33: Areas A and B, see text
3.2.3.1. Severe local fouling between the runout at the helices.
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Figure 34: Area B, see text 3.2.3.2.
Arrangement of reverse helix at the opposing running surface resulting from pressure build-up in the assembly. Refer also to Figure 35 below
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Figure 35: Areas A and B, see text
3.2.3.2. Arrangement of sealing edge and reversed helix resulting from pressure build-up at the medium side.
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Figure 36: Area A, see text
3.2.4.1.
Blister formation in the sealing lip region of the radial shaft seal caused by oil vapor diffusing into the elastomer. The oil and the elastomer are situated in the thermal boundary. The blister is filled with oil.
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Figure 37: Area A, see text
3.2.4.1.
Thermal overloading and chemical etching of the sealing edge of a FKM radial shaft seal in contact with a synthetic oil.
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