It is possible that the casting may originally have been defective but this has rarely turned out to be the problem. The drive speed should be checked any time a pump is replaced with a different brand or model. If the pressure will not build to the desired level, isolate the pump and relief valve from the system. The compensator will, in effect, be bypassed, and the operating concept for which the system designer specified pressure compensation will be negated. Performing these recommended tests should help you make good decisions about the condition of your pumps or the cause of pump failures. Is the electric motor running? If set too low, the compensator spool will shift and start reducing the pump volume when the system is calling for maximum volume. A fixed displacement pump delivers a constant volume of oil for a given shaft speed. This hardware includes the number of power-wasting devices present, such as proportional valves, flow controls, and pressure-reducing valves. Vane pumps generally are quieter than piston and gear pumps. If the pump is delivering less oil than when it was new, the current to drive the pump will drop. To solve this problem, seal the reservoir air tight and maintain 1 or 2 PSI (no more) on top of the oil. Priced at $45.99 the book is available now from Amazon.com. This recently occurred on a refiner where the hydraulic pump was used to maintain a precise gap between the discs. Oil of wrong viscosity or of poor quality. available for FREE download here. The relief valve must always be set higher – 100 to 150 psi — than the compensator. Rexroth/Uchida Hydraulic Pump Repair. When the new pump also did not build pressure, the manual valve in the outlet line was closed to isolate the pump from the system. While the damage may not be immediate, if a pump is continually started up when the oil is too cold, the pump eventually will fail prematurely. After the visual and sound checks are made, the next step is to determine whether you have a volume or pressure problem. When a hydraulic issue occurs, the pump usually is one of the first components changed out, but it actually should be the last. Once the threads have been damaged there is no easy way to repair the pump. a. Shaft turning in wrong direction. This company assumes no liability for errors in data nor in safe and/or satisfactory operation of equipment designed from this information. Since water settles to the bottom, it will drain off before oil starts coming out. So let's apply these fundamentals to the above situation in a way that ensures the obvious things are not overlooked. On some pumps (piston pumps or those pumps operating with an overhead reservoir), there may be a slight pressure behind the shaft seal. If it is, shut down the pump, remove the solid piped pump case drain line, and replace it with a hose. Aeration is sometimes known as pseudo cavitation because air is entering the pump suction cavity. Written in an easy-to-read style with clear concise text, it also suggests where readers can go to learn more about a particular subject. In order for the 'obvious' to be obvious, the fundamental laws of hydraulics must be kept in mind: Theory is great, but it always makes more sense when put into practice. But with fuel consumption being more important than any modest saving in cooling capacity, the idea of paying more for a pump that resulted in the oil being kept at a lower operating temperature—but increased fuel consumption—was irreconcilable to the machine’s engineers. Learn more. maximum pressure at the outlet port Pump will not build/hold pressure. Hydraulic Pump Calculations ... Womack Data Sheet 48: Troubleshooting Tips for Hydraulic Pumps. It follows that if the pump can't get oil it can't produce flow. If load and surface speed remain constant, but elevated operating temperature causes viscosity to fall below that required to maintain a hydrodynamic film, boundary lubrication occurs; this creates creating the possibility of friction and adhesive wear. The pump is arguably the heart of almost every hydraulic system and, as such, has traditionally been blamed for almost every operating problem. Sign up for Hydraulics & Pneumatics eNewsletters. If you're skilled in reading and interpreting hydraulic symbols, the system's schematic diagram (if available) can be useful in identifying possible locations. Fluid viscosity is one of the factors that determines whether full-film lubrication is achieved and maintained. In any troubleshooting situation, no matter how simple or complex the hydraulic system, always start with the basics. The temperature of the pump housing and suction line should also be checked. A check of the hydraulic schematic showed a strainer in the suction line inside the tank. I know of one plant where the pressure at the pump outlet port was fluctuating. Since 1994, GPM has provided hydraulic training, consulting and reliability assessments to companies in t... Why You Shouldn’t Overlook Hydraulic Pipe Size, Understanding Logic Valves in Hydraulic Systems, Fire-resistant Hydraulic Fluids: What You Should Know, Product Unboxing - The Conserver® Oil Purification Unit, Product Unboxing - AMETEK Spectro Scientific FerroCheck 2100, The Cost Effective Benefits of a High Performance Kidney Loop System, How to Cost Justify a Lubrication Program, Use Lubricant Zone Inspections for Early Problem Detection. The electric motor is driving the hydraulic pump at a speed that is higher than the pump’s rating.

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