Condensed table causes of trouble and their effects in hydraulic installations. Apr 11, 2014 explanation of how a hydraulic gear pump works and what is repairable in it. However, this occurs best at the manufacturers recommended capacity. The inclusion of adequate test points for pressure readings, although not essential for operation, will expedite troubleshooting. The maximum vacuum at the pump suction should never exceed 15 of mercury. Your final drive or hydraulic motor represents a major investment in your equipment not just because of the cost, but because failure literally brings your equipment to a grinding halt. The hydraulic hand pump manual has been updated to include cuttingedge imaging technology by ngrain. To help keep your systems operating safely and at maximum efficiency, rexroth offers pump accessories. If this oil film is sufficiently sustained through proper system maintenance and operating within recommended limits a long pump life can be expected. Completely retract the ram before opening the fillerscrew on the pump to add hydraulic.
Other potential symptoms of aeration could include liquid foaming, erratic actuator movement or even the failure of hydraulic gear pumps. Double acting cylinder piston seals are cut or worn out 1. Displacement d the displacement of a rotary gear pump is the volume displaced during one complete. Logical troubleshooting in hydraulic systems eaton.
P series hydrostatic pumps service and repair manual. The correct way to test the hydro system would be use a bidirectional flow meter. In this shop talk blog post, we are going to discuss how you can solve the biggest problems with hydraulic motors and keep your equipment running. Please read and observe the hydraulic product safety page before proceeding further. Troubleshooting and preventive maintenance of hydraulic systems learning to read the signs of future. Centrifugal pumps develop pressure by increasing the velocity of the liquid liquid is literally flung out of the cutwater. Try this simple tip before you blame your gear pump for.
Hydraulic pump motor division pressure compensator pressure compensated pump will provide full pump flow at pressures below the compensator setting. This speed oil flow can be increased or decreased by using a pump. Hydraulic gear pump and motor failure analysis and repair. A fixed displacement pump delivers a set volume of oil for each revolution of its drive shaft. Pump rotation should always be viewed from the shaft end. Try to set preconceived ideas of what could be wrong aside and base your statement on facts that are accurate and unbiased. Available in a wide variety of sizes and configurations to suit your application needs. Hydraulic pump motor division greeneville, tn 37745 usa 10 parts list caution these service parts are intended for use in hydraulic pumps.
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. A gear pump uses the meshing of gears to pump fluid by displacement. Troubleshooting guide continued troubleshooting guide part 2 problem possible cause corrective action rapid pump wear abrasives in fluid install suction strainer. Any of this fluid flow that is not required, by the hydraulic system to do work, is sent back to the oil reservoir over a restriction. Hydraulic fluid and temperature recommendations for industrial machinery. The pumps will stop automatically if the level drops to the shutdown level. Basic hydraulic troubleshooting training system handson. Dont assume you need to replace your gear pump until youve tried this one simple test. If you dont detect it, theres a good chance the problem is elsewhere.
This pump is preferred over a fixed displacement gear pump. Pvp series variable volume piston pump service bulletin model. Hydraulic gear pump and motor failure analysis and repair guide. The lippert hydraulic full wall slideout system is designed as a negative ground system. Hydraulicspneumatics com sites hydraulicspneumatics com files uploads. No grinding or welding operations should be done in the area where hydraulic components are being installed. Overview sauerdanfoss gear pumps and motors are ideal for a wide range of applications for. This problem will not occur if inlet vacuum and rated speed. Abstract the paper comprises research results of the gear pump typical failures and their connection with.
Misalignment longcoupled pump align pump and motor. Images in this pdf files displaying an ngrain logo are interactive. Inspections for possible problems with gear pumps download. There are no serviceable parts within the pump unit. We can see the gear sets for all three sections and the input drive shaft. Power is applied to the splined center shaft thus turning the gears. All cylinder, valve, pump and hose connections should be sealed andor capped until just prior. Another difficulty is that the same lack of skill and experience is creating many of these problems in the first place. P series hydrostatic pumps service and repair manual bln52503 august, 2010 pc pj pw pr pgpe pk. This new format allows the reader to practice disassembly and reassembly of practically any type of mechanical device in a 3d view. When troubleshooting an internal gear pump or any other pump for that matter, develop a clear, concise, and objective statement of the problem. To achieve the required flow and to ensure you have a suitable pump, you would n. The pump is arguably the heart of almost every hydraulic system and, as such, has. The electric motor is driving the hydraulic pump at a speed that is higher than the pumps rating.
Positive displacement pumps allow liquid to flow into an open cavity trap the liquid in the pump transport liquid from the suction to discharge port mechanically force liquid out of the pump. Hydraulic pumpmotor division hydraulic flow is developed as the pump rotating group is driven by a prime mover hydraulic pump basics fluid is forced out of pump at the pump outlet a partial vacuum is created at the pump inlet and atmospheric pressure forces fluid into pump from the reservoir. Pg330 pg331 tutorial01 cast iron gear pump salami spa. Gradual or sudden loss of pressure or flow resulting in a loss of power is common in hydraulic system failure. Group 3 gear pumps technical information bibus hidrotos.
Aug 26, 2015 investigate what may be causing poor pump performance. Condensed table causes of trouble and their effects in hydraulic installations source of trouble, effects 1 mechanical drive 2 suction line 3 pump 4 pressure line 5 return line 6 pressure valves a excessive noises 1. Some gear pumps can be rotated in either direction, but most have an arrow on the housing indicating the direction of rotation. General gear pumps and gear motors technical information. If the motor, manifold, pump or reservoir fails, the entire power unit must be replaced. Fixed displacement, external gear pump designed for medium pressure applications. Pat clark of lifting gear hire demonstrates a few troubleshooting solutions for your hydraulic cylinders and pumps in the hopes of ensuring a successful and productive project. The raymarine hydraulic pump also known as the raymarine reversing hydraulic pump is intended to operate a vessels steering mechanism as part of a raymarine autopilot system.
They are one of the most common types of pumps for hydraulic fluid power applications. If you do see the pump heat up instantly you just found your culprit, and it took you but a couple of minutes. In such cases there are provided some gear pump for charging of raw material viscosity varies from 100 cp to cp and also with season viscosity vary of similar raw materials. This can be detected by installing a vacuum gauge directly at the pump suction. If the pump is rotated in the wrong direction, adequate fluid will not fill the suction port due to the pumps internal design. Hydraulic pumps fixed displacement pumps the gpm of the fixed displacement pump can not be varied. This manual includes the hgmh series motor general description. Relief valves and fixed displacement pumps provides a flow path for the pump volume back to tank limits the maximum system. System tests for piston pumps when a hydraulic system has problems, it is common practice to first look at the pump.
For detailed information on a particular product, please consult the specific technical manual for that product. Hi, in plant some of the raw materials we have to charge through barrels and pump into reactorvessel. Gear pumps, hydraulic pumps,hydraulics, dowty gear pump new, dowty p4000 series gear pump. Buy new or surplus fenner kp20 or kp20 hydraulic gear pump spx 2bolt mount parts. Pdf hydraulic gear pump and motor failure analysis and. An understanding of the basic hydraulic principles must be. Permco is a leading manufacturer of highpressure hydraulic gear vane pumps and motors, flow dividers, intensifiers, and accessories. The suction lift is too great or the suction line is too small or too long. All hydraulic pumps must be properly assembled and installed in the hydraulic.
Just some of the great pumps that we are able to provide include. This data sheet describes a stepbystep checkout procedure for hydraulic systems which have previously been working satisfactorily but which have developed trouble, usually over a 24hour working period, which renders them. The following information can be used to install and test the. Hydraulic fluid is drawn into the input port of the pump and discharged from the output port. Hydraulic gear pump and motor failure analysis and repair guide page 2 of 32 alamo industrial 1502 e walnut st, seguin, tx 78155. The design purpose of the p series flow test kit is to allow the customer to isolate the pump from the. Hydraulic troubleshooting is one of our specialties here at bernell hydraulics. 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. Hydraulic machines questions and answers pdf free download for freshers hydraulic machines mcqs interview questions objective type lab viva manual. The hydraulic slideout system is a fixed displacement system, using double acting hydraulic cylinders to open and close a room assembly built into the travel trailer or motor home. Cylinders are energized by a 12 volt dc high pressure hydraulic pump through electrically. Understanding the cause and remedy of your pump issue, along with some simple preventative steps, you can get back on track with smooth hydraulic metering pump.
Troubleshooting tips for hydraulic pumps womack machine. This speed oil flow can be increased or decreased by using a pump of higher or. Once youve determined if your issue is mechanical or hydraulic, use the chart below to determine what could be causing your internal gear pump to perform poorly. A gear pump is a positive displacement pump, meaning that whenever the pump is turning the pump must pump oil. Vaporization caused by higher vacuums will generally result in capacity drop off. The result is hydraulic pumps with greater precision, dependability, and reliability. Introduction the purpose of this manual is to provide information useful in servicing the hydrogear hgmh series motor. See product dimensional information page 35 for outline drawings of pumps and the. The definitive guide to hydraulic troubleshooting is equally relevant to both mobile and industrial hydraulic applications. This portable document format \ pdf \ file contains bookmarks, thumbnails, and hyperlinks to help you navigate through the document. Insidepenton com electronic design adobe pdf logo tiny. Incorrect installation or assembly of these parts could cause the pump or pumps being repaired to fail in subsequent use or to operate incorrectly.
We love having folks bring in worn or damaged parts and ask us to help them figure out the possible causes of the problem. Turn to the best for your next gear pump repair or overhaul. Typically, the cleaner the hydraulic system is maintained, the. It is primarily designed for use on vessels with an existing hydraulic steering system. The hgmh series motor utilizes a friction type brake controlled by a cam attached to an external actuating arm. The pump is arguably the heart of almost every hydraulic system and, as such, has traditionally been blamed for almost every operating problem. Table of contents overview 1 pump disassembly 2 control disassembly reassembly 7 pump reassembly adjustment procedures dr control 19. Check system relief valve for proper setting with pressure gauge in outlet line 2. Hydraulic systems are extremely important to the operation of heavy equipment. For standard multiple pumps, see multiple pump technical manual. System components product specification sheet hpto hydraulic gear pump spline shaft, type r. Hydraulic principles are used when designing hydraulic implement systems, steering systems, brake systems, power assisted steering, power train systems and automatic transmissions.
It may be calculated from the physical dimensions of the gears, or it. Alternative designs, such as internal gear pumps, can serve applications that demand more than what external gear pumps can deliver without the expense of axialpiston pumps. Condition likely cause correction muncie power products. All sauerdanfoss gear pumps use hydrodynamic journal bearings that have an oil film maintained between the gear shaft and bearing surfaces at all times. Knowing the system probably the greatest aid to troubleshooting is the confidence of knowing the system. How to solve the biggest problems with hydraulic drive. Creating pressure beyond the rated capacity can result in personal injury. Running volutestyle pumps at a lower capacity than the manufacturer recommends can put lateral stress on the shaft of the pump, increasing wearandtear on the seals and bearings, and on the shaft itself. Troubleshooting and preventive maintenance of hydraulic. You may just find that it wasnt the pumps fault after all. We will introduce many aspects of troubleshooting hydraulic systems and will share information that will help you to better understand and enhance the operation of your hydraulic equipment.
The life expectancy of all hydraulic components is directly related to the cleanliness of the hydraulic system that it operates within. 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. If pump flow is totally blocked, sudden failure of the pump or other component will occur. As the angle of the pump swashplate is increased, the amount of oil being pumped will increase and cause a higher speed output of the wheel motor. Pump do not exceed the maximum capacity of the pump or tamper with the internal high pressure relief valve. I already have a stack of books about hydraulics the definitive guide to hydraulic troubleshooting is not a book. Basically, the flow meter will show the loss of oil flow at different pressures. The pump is probably the component most subject to wear in a hydraulic system, and the one most likely to cause a. Since the completed acquisition in 1994, honor has gained a reputation for design expertise and product quality through innovative engineering and leading edge production techniques. Understanding the basic hydraulic systems and components can be of great value when troubleshooting and testing hydraulic. All openings in the reservoir should be sealed after cleaning.
One of the major problems facing industry is the limited number of people with sufficient skill and experience to diagnose and rectify the basic problems plaguing centrifugal pumps. This pump troubleshooting guide can help with your common pumping concerns. Cavitation cavitation is caused by excessive vacuum at the pump inlet. Gear pump repair hydraulic cylinders coastal hydraulics. Dc power unit troubleshooting guide kti hydraulics, inc. Replacement seals, safety valve, mounting flanges, brackets, and adapters make installation easier and faster, too. Sauerdanfoss high performance gear pumps are fixed displacement pumps which. 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. System test for pressure relief valves system test for sequence valves. Fsa compliance manual template download fenner stone repair manual. Do not use teflon tape on pipe thread fittings pump is hot. We will introduce many aspects of troubleshooting hydraulic systems and will share information that will help you to better understand and enhance the operation of. If the speed is too high, a higher volume of oil will be needed at the suction port.
Close inspection of gear pumps removed form service will show if those pumps can be repaired. During the operation of the pump, fluid is lost from the hydraulic. When working on a hydraulic system always insure hydraulic lines have been depressurized. Some of these skills include using an incircuit test to troubleshoot a fixeddisplacement pump, adjusting a cylinder cushion, troubleshooting a check valve, testing a hydraulic system by measuring fluid flow, and troubleshooting vibration in a hydraulic system. Reversing the angle of the swashplate will reverse the direction of the oil flow. Inspection and repair after parts have been cleaned, they should be checked for changes. So, whenever you detect insufficient pressure in a gear pump driven hydraulic system, check the pump body for instant overheating. Coastal hydraulics is the shop of choice for hydraulic system and component repairs. General hydraulic hints good assembly practices most important cleanliness. Once the pump flow is restricted, pressure will build up to the setting of the compensator and then the pump will destroke to the level needed to maintain the compensator pressure setting.
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