Diesel Ing

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Proceso hidraulico
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  Dieseling Indications The cylinder drifts at a high rate. Oil temperatures are elevated due to flow of oil through small clearances at high pressure. The piston seal ring or rubber expander ring is eroded in a finger-like pattern. The area around the erosion is blackened and sometimes smells burnt. Possible Root Causes When air or other entrained gases, that are saturated with oil vapors form in the hydraulic oil dieseling occurs. When these bubbles are compressed, at a high rate the gases ignite due to adiabatic heating. The resulting explosion erodes adjacent components, especially nonmetallic parts. Refer to Illustrations 22 and 23. Remedy  All efforts should be made to remove air or other entrained combustible gases from the system after resealing a cylinder before using the machine. Extend and retract the cylinders several times before heavy work is done to force air back to the tank. Piston Seal Ring damaged by Dieseling. Piston Seal Ring Damaged by Dieseling at the Step Cut. Explosive Decompression Indications   The cylinder drifts at a high rate. The rubber expander ring has large chunks of material missing. Refer to Illustration 24. There is no smell of burning or damage to the seal ring. Possible Root Causes Explosive decompression (ED) occurs when gases that have penetrated into a rubber expander ring suddenly expand due to a rapid drop in hydraulic oil pressure. Also when voiding occurs in the cylinder. The rapid expansion of the entrained gas bubble pops a chunk of material out of the rubber ring. If the damage accumulates, the ring can no longer properly seal. Remedy  All efforts should be made to remove air or other entrained gases from the system after resealing a cylinder before using the machine. Extend and retract the cylinders several times before heavy work is done to force air back to the tank. Refer to the cylinder removal and install procedure for the specific model for more specific instructions. Use dieseling/ED resistant piston seals. These seals are made of a rubber material designed to be less permeable to gases in the hydraulic oil. Use protection piston seal backup rings. These rings reduce the area of the rubber expander ring that is exposed to the oil. Therefore reducing the amount of gas that penetrates the rubber. Comments ED and dieseling are similar. The root cause of ED and dieseling is air in the hydraulic system. Piston seal expander ring heavily damaged by explosive decompression
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