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The ideal concentration is between 32.5% and 37% urea. The best way to test and monitor the concentration of urea-based DEF is to use a digital refractometer. This can cause serious contamination-related issues - and unplanned downtime. If the area around the tank and cap isn’t cleaned before the cap is undone and fluid is added, it’s very easy for dirt or dust to fall in and get washed down into the tank. Contaminants around the fill cap can make their way into DEF and cause damage as well. Avoid ContaminationĭEF is extremely sensitive to contamination - for it to work properly, purity is critical. Your dealer can walk you through the steps to avoid unnecessary damage and the associated costs. To avoid running up excessive repair bills, talk to your operators and be sure they know to immediately contact you and your equipment dealer if they accidentally added DEF to the fuel tank. If you are ever in doubt if the correct fill hole was used, drain and flush the tank with deionized water or clean DEF fluid. Usually, the DEF fill hole is smaller in diameter. If you have machines where the DEF and diesel tanks are near each other, another easy way to tell the difference is the size of the fill holes. If that happens, and an operator starts a machine with DEF in the fuel lines, it can potentially cause tens of thousands of dollars in damage. But fuel and DEF tanks are close in proximity on some equipment, so it’s not surprising this mistake occurs. The liquid, which looks like water, is sprayed into the exhaust before it exits the machine.ĭEF should never be mixed with diesel fuel, and it has its own filling port. Don’t Confuse FillsĭEF is an emissions control solution designed to lower the nitrogen oxide emissions in diesel engines. Inadvertently putting DEF into the diesel tankĪny one of these is a potentially major issue that can cause significant damage to your equipment.A common engine-related call involves diesel exhaust fluid (DEF).
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Rhys Eastham, Director – Uptime & Technical Services, Volvo CEĮvery day, technical support teams at construction equipment manufacturers and dealers get calls from customers covering any number of topics.