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anatomy of a hydraulic pump failure
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| Figure 1. When hydraulic fluid is contaminated with hard particles that are the same size as the clearance between two lubricated surfaces, three-body abrasion occurs. |
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| Figure 2. The scoring of the hydraulic pump's valve plate (bright areas) is confined to the inner and outer edges of its sliding surface. If the scoring had been caused by three-body abrasion, the damage would be more evenly distributed across the entire surface, with the areas between the pressure kidneys (top of picture), likely to exhibit the heaviest damage. |
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| Figure 3. The scoring of the hydrauilc pump's cylinder barrel is heaviest top right of the picture and lightest bottom left, indicating uneven contact with the valve plate. |
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"This book has the potential to save many
organizations lots of money. It should be on the bookshelf of every engineer, supervisor, planner and
technician that deals with hydraulic equipment... it's worth its weight in gold." Find out more
Alexander (Sandy) Dunn |
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