The customer observed numerous fault indicators whilst cleaning and maintaining his equipment. Electrical applications were checked but the errors emerged again. Off-Highway Powertrain Services (OHP Services) recommended a vibration measurement to understand the possible root cause and prevent consequential damages caused by the attrition of mechanical components.
Our experts ensured the customer was aware that increased vibrations and noise in high frequency areas are indicators of progressive attrition within the bearings of a pump. During the cleaning process different liquids with different viscosity cause variations in pressure which leads to a decreasing capacity. As a result the control system tries to compensate for this through increasing the operating speed of the pumps. In only a short-time capacity fluctuations occur, however the control system of the engine is not capable to compensate for these fluctuations and consequently an error message appears.
In addition, due to the higher speed of the pump the risk of attrition increases. A statement about the exact condition of the pump and the bearing life is not possible therefore, the recommendation was to replace the pump as soon as possible. In order to be able to detect such damages earlier and prevent excessive ordering of spare parts OHP Services recommended that in future preventive maintenance by means of vibration analysis is undertaken.