The pump is probably the component most subject to wear in a hydraulic system, and the one most likely to cause a sudden or gradual failure in the system. Hydraulic gear pump and motor failure analysis and repair guide page 3 of 32 alamo industrial 1502 e walnut st, seguin, tx 78155. But before you trash it, understand the root cause of the failure so you can be sure the next pump doesnt meet the same demise. The grease in the reservoir is pumped through the primary line, to the distribution blocks. Gear pumps are often used in pumping relatively viscous liquids, such as some viscous liquid hydrocarbons, liquid fuels, lubrication oil pumping in machinery packages, hydraulic units and fluid power transfer units. Dc power unit troubleshooting guide kti hydraulics, inc. Apr 28, 2019 troubleshooting lippert electronic rv leveling system points to failed motor. Inspections for possible problems with gear pumps download. Related to these is the troubleshooting tree, a type of flowchart that walks the troubleshooter through a series of actions and decision points, and hopefully, to the trouble.
Chris rauwendaal isbns 9781569904701 1569904707 hanser hanser publishers, munich hanser publications, cincinnati sample chapter 1. Griswold pump company pump operation page 20 installation, operation and maintenance manual griswold model 811 troubleshooting if problems are encountered during startup or pump operation, refer to the folowing table for. Troubleshooting tips for hydraulic systems womack machine. The oilgear pvl pump line is a basic, highpressure, variabledelivery, twoway pump. Discharge pressure too high increase pipe diameter. Similar troubleshooting aids may be provided with more sophisticated equipment, and some maintenance people construct their own. Unico srp application dynacard troubleshooting 5 1. An external precision gear pump is usually limited to a maximum working pressure of 210 bars 21,000 kpa and a maximum speed of 3,000 rpm. Systems are not adequately protected from contamination, causing excessive wear, hydraulic. Geitner by permission of the publisherbutterworth heinemann of 225 wildwood avenue, woburn ma. Adjust relief valve to manufacturers specification. The correct way to test the hydro system would be use a bidirectional flow meter. Troubleshooting the positive displacement rotary pump. General gear pumps and gear motors technical information.
The pump is arguably the heart of almost every hydraulic system and, as such, has traditionally been. Features include a small footprint, plus drives that are stackable. Hydraulic cylinders and pumps come in a variety of shapes and sizes but they also can experience a few common errors. Possible pump trouble cause cure aeration and cavitation. You will need this information when asking for specific assistance with service andor repair.
Gearbox typical failure modes, detection and mitigation methods. A gear pump is a kind of rotary pump and is defined as a positive displacement pump. Vane pumps generally are quieter than piston and gear pumps. Green is the fluid returning from the bore of the cylinder back to the reservoir. Sauerdanfoss accepts no responsibility for possible errors in catalogs, brochures and other printed material. Machinery failure analysis and troubleshooting by heinz p. They are one of the most common types of pumps for hydraulic fluid power applications. So replaced a hydro pump and wheel motor or a lazer z and cannot get it to bleed out and purge the air. Understanding and troubleshooting hydrostatic systems alan dellinger.
Troubleshooting gear pump assisted singlescrew extrusion. Displacement d the displacement of a rotary gear pump is the volume displaced during one complete. Operation manual for automatic leveling systems with touch. This portable document format \ pdf \ file contains bookmarks, thumbnails, and hyperlinks to help you navigate through the document. Hydraulic gear pump and motor failure analysis and repair guide. Simultaneously the metering units press a certain amount of grease the dosage through the. Basically, the flow meter will show the loss of oil flow at different pressures.
Try this simple tip before you blame your gear pump for. Gear pumps problems are divided into two main categories. Indeed, why test anything else when you can just take the pump to local hydraulics dealers and get their professional opinion after about a year of working in a shop i knew for sure how to evaluate a gear pump just by looking at its parts. To achieve the required flow and to ensure you have a suitable pump, you would n. Troubleshooting the extrusion process hanser publications. An effective pump troubleshooting tool will always begin with the question when did this start. Gear pumps are the most popular type of positive displacement pump. Analysis of defects and failures of hydraulic gear. Noisy pump use vacuum gauge to isolate problem low oil supply. With some simple preventative steps, your pump can run smoothly without needing a pump troubleshooting guide. And that means you pay only for as much system as you need. Do not attempt to perform any maintenance and repair work on the powered x skid. Improper impeller trim remove pump and replace impeller 3.
Gear pumps make good chemical additive dosing pumps provided material compatibility issues are addressed. Pump test procedure for evaluation of antiwear fluids for mobile systems. All content contained herein is subject to change at the companys discretion without notice. Replaced hydro pumpmotor and cannot get it to bleed. Mishawaka in 46544 8003344712 fax 574 2566743 page before you level your coach 2 operating instructions 3 retracting your leveling jacks 3 manually operating your jacks 4 preventive maintenance 5. Gear pump manual original instructions albany pumps. When fastening piping to the pump do not impose any strain on the pump casing. It is very important that the pump angle is not reversed see figure 12 for proper mounting. It may be calculated from the physical dimensions of the gears, or it. System tests for piston pumps when a hydraulic system has problems, it is common practice to first look at the pump. Standard skids include a hydraulic pump, electric motor, and either a single or dual standard capacity or. The prv can be piped back to the suction side of the pump or into the supply tank. Magnetic drive circulation pump is a fullsealed pump, for motor connection shaft and impeller are separately equipped with magnetic materials, they attract each other and coupled. It delivers a smooth pulsefree flow proportional to the rotational speed of its gears.
Troubleshooting the extrusion process a systematic approach to solving plastic extrusion problems 2nd edition maria del pilar noriega e. Defects classification pawel pietkiewicz chair of mechanics and machine design university of warmia and mazury in olsztyn k e y w o r d s. Remove seized fifth wheel landing gear and replace with ultra fab. Common conditions requiring pump troubleshooting expertise are cavitation, hydraulic imbalance, undersized shafts, and mechanical seal failure.
We are facing cavitation problems in the lubricating oil gear pumps. The following decision tree is intended to assist both owners, and potentially their mechanics, in efficiently troubleshooting system. When a pump starts to cavitate its noise level increases, and it may become extremely hot around the shaft and front bearing. When troubleshooting an internal gear pump or any other pump for that matter, develop a clear, concise, and objective statement of the problem. Overview of pump problems typically found on centrifugal pumps. Try this simple tip before you blame your gear pump for system failure dont assume you need to replace your gear pump until youve tried this one simple test.
This results in only 8,000 hours of service life, which is too low. Condition likely cause correction muncie power products. If you discover errors while reading the documentation or have suggestions or other useful information. Please read this manual carefully before using the pump in. All too often, blame is placed on the pump because its the pump itself thats noisy and vibrating. In order to prevent problems, please read the instruction manual and operate accordingly. Troubleshooting hydraulic pumps machinery lubrication. The high volumetric efficiency of barmags precision gear pumps ensures a reduction of pressure fluctuations to as little as 110 of the original pressure fluctuations upstream of the gear. The pump may be worn out or the oil may be too thin. If you have a pump which has lost the sticker that covers the buttons, which has a button that doesnt respond, or which displays a button error, it is likely repairable. Some manufacturers produce gear pumps with higher working pressures and speeds but these types of pumps tend to be noisy and special precautions may have to be made. It is the pressure exerted by the vanes that moves the water out of the pump and into the system. You will also spot hydro gear pumps, filters, seal kits, and transmissions with parts lookup.
The gear pump was invented around 1600 by johannes kepler gear pumps are also widely used in chemical installations to pump. Pump cavitation cavitation is the inability of a pump to draw in a full charge of oil. As the impeller rotates, the veins pick up the water and sling it out into the pump body under pressure. Alfa laval solutions to specific centrifugal pump problems 31 how alfa laval can provide solutions to specific pump problems. When installing or operating gear pump motor combinations, the instructions given in this manual must be read in conjunction with the instructions provided with the gear pump. If a gear pump is contributing to the generation of the.
Pumps which may be vane, gear, or piston types are used in hydraulic systems to produce sufficient flow to obtain the speed required from cylinders or motors. Extended dry running install power sensor to stop pump. Small gear pumps usually operate at a speed between 1,700 rpm and 4,500 rpm, and larger models most often. Wear clearance between gear teeth and gear chamber.
This manual contains specific information for gear pump drives. Gear pumps repair information series 26 model 26000 multiple gear pumps. Checklist of problems vvith centrifugal pumps and their causes. Typical problems and their effect on rotary lobe pumps 19 detailed look at the most common problems advising causes and solutions. Do not use teflon tape on pipe thread fittings pump is hot.
With the pvl lines modular design, there are fewer installation problems. A gear pump uses the meshing of gears to pump fluid by displacement. May 11, 2015 a gear pump used with a twostage, vented screw can allow high operating rates at higher discharge pressures while not causing material to flow into the vent. Before attempting to repair an insulin pump, have a plan for what to do if the repair fails, or if the pump stops working some time later. Compalube general manual groeneveld lubrication solutions. Aug 26, 2015 but, one day, your internal gear pump stops performing its daytoday function and all heck breaks loose. When the inside of the pump is worn when galling of the gear or burning of the shaft bearing metal is about to occur when foreign objects are caught when the gland packing is closed too tightly when the pump is misaligned or the v belt is too tight due to warp, etc. Do not use the pump to correct errors in piping layout or assembly. The api max fluid load is the maximum theoretical pump load when the well is pumpedoff, also known as fo max. It is very important that the pump angle is not reversed. Reduce pump speed or use larger pump running at lower speed. I have replaced about 6 of these in my lifetime and just letting it run wide open on jack stands always seemed to work well.
Useful information on gear pumps michael smith engineers. This paper presents an experimental study of external gear pump efficiency based upon an analysis of the stribeck values. Thanks for viewing, comment, rate and subscribe for more videos. Hydraulic pump troubleshooting guide no oil flow from pump. Start by reading your manufacturers manual and any installation and operation instructions. Rapid pump wear abrasives in fluid install suction strainer. We have six 6mw diesel generator sets to meet the power requirement of our cement plant. Its unnecessary to fit with traditional shaft seal.
List of abbreviations the following abbreviations are used in this guide. One of the following problems will most likely be the cause if any of the above symptoms appear, if they are indeed caused by the pump. A flow of oil is produced by the pump due to this rotation. The damage occurs to both the housing and gear surfaces. Understanding and troubleshooting hydrostatic systems. When the new pump also did not build pressure, the manual valve in the outlet line was closed to isolate. Water enters at the center, known as the eye of the impeller. If you are facing problems in working conditions, the troubleshooting tables for vane pumps and vane motors in the chapter 4 will help you to find out what can be wrong and the eventual remedies failurecausesolution. When leakage flow is big enough to become a pressure limiting factor. When checking angle ensure that the inlet side the fuel is drawn into the pump is the low side and the outlet side fuel exits the pump is the high side. The auxiliary components necessary for your particular application can be easily manifolded or added.
Whether youre looking for hydro gear transaxles, such as hydro gear zt3100, zt2800 among others. A new pump would barely permit a sheet of wrapping paper to be inserted. Sauer danfoss reserves the right to alter its products without prior notice. The fixed displacement gear pumps utilized by alamo industrial are of a proven design and will. Dec 15, 2014 hydraulic cylinders and pumps come in a variety of shapes and sizes but they also can experience a few common errors. Hydraulic gear pump assembly and inspection youtube. Troubleshooting positive displacement pumps mc nally institute. Orange is fluid traveling from the gear pump to the rod end of the cylinder. At hydro gear parts youll find the best replacement for your mower or any outdoor equipment. Excessively high temperature in the oil causes the oil to thin out and to slip excessively in the pump. Troubleshooting lippert electronic rv leveling system points. Springing or drawing the piping up to the pump will cause distortion, possible misalignment and probable rapid wear of the pump.
Pdf gear pumps are often used in tandem with singlescrew extruders to increase rate. This speed oil flow can be increased or decreased by using a pump of higher or. Is the fuel gear pump pressure greater than the specifications outlined in procedure 005089 fuel pump gear pump module in the isc, isce, qsc8. Seven step troubleshooting wiki odesie by tech transfer. Cavitation increase pump submergence, lower pumped liquid temperature, check sump for compliance with hi recommedations, redesign sump if necessary 5. Symptoms of common hydraulic problems and their root causes. Pat clark of lifting gear hire demonstrates a few troubleshooting. Troubleshooting tips for hydraulic pumps womack machine. Grease lines from the metering units to the individual grease points. The pump is arguably the heart of almost every hydraulic system and, as such, has traditionally been blamed for almost every operating problem. This manual provides service information for the eaton model 26000 multiple gear pumps. Speed problems in hydrostatic drives are usually related to either the incoming dc signal or the servo valve. Step by step instructions for the complete disassembly, inspection, and reassembly of the pumps.
The usual story is the machine has lost pressure and, of course, the gear pump is the primary suspect. When using a gear pump a pressure relief valve must be fitted to protect the pump if deadheaded against a closed valve or blockage. The front mounted gear pump utilizes power from the engine crankshaft to provide rotation of the pump. Try to set preconceived ideas of what could be wrong aside and base your statement on facts that are accurate and unbiased. There is, however, a very simple way to discover if a gear pump has volumetric issues. National renewable energy laboratory national wind technology center. Hydraulic gear pump and motor failure analysis and repair. Troubleshooting guide for hydraulics hydraulic analysis and proper repair require the use of a vacuum gauge and pressure gauge for testing. View and download hydro gear zt2800 service and repair manual online. In normal operation with a good pump, the pump case may run 20 to 30f more than the tank oil temperature.
Pdf an investigation of external gear pump efficiency. Centrifugal pump troubleshooting guide this material was reproduced from practical machinery management for process plants. Avoiding damage to hydraulic motors from temperature shock. Gear pumps are roughly classified into external and internal gear types. The article has been written keeping in mind the level and interests of students and the beginners in operation. System test for gear and vane pumps when a hydraulic system has problems, it is common practice to first look at the pump. They can either be plumbed just to the pump to test the pump or they can be plumbed inline between the pump and wheel motor to test both at the same time. Pat clark of lifting gear hire demonstrates a few troubleshooting solutions. For gear pump assisted extrusion, the extruder control algorithms are set to maintain a constant pressure to the inlet side of the pump by the extruder.
High slippage in the pump will cause it to run much hotter than the oil in the tank. Pump trouble is usually characterized by increased noise, increased heat, erratic operation of cylinders, difficulty or inability to develop full output, decreased speed of cylinders or. Abstract the paper comprises research results of the gear pump typical failures and their connection with. The amount of flow is dependent upon the size of the gears in the pump and the speed of the engine. Check all components, particularly the relief valve for proper settings. The volumetric, mechanical, and overall efficiencies of a variety of. Hydraulic troubleshooting is one of our specialties here at bernell hydraulics. Corrosion wear use materials of construction that are acceptable for fluid being pumped. In todays video, we are assembling anad inspecting a positive displacement high pressure hydraulic gear pump. The pump is arguably the heart of almost every hydraulic system and, as such, has. When a pump wearsout, its sealing clearances become larger, which causes reduction of useful flow and an increase of the internal leakage.
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