Do not use teflon tape on pipe thread fittings pump is hot. 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. Suction andor discharge piping not anchored or properly supported. 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.
The larger pump of the combination is situated at the shaft end the drive side. This manual includes the pump s general descriptions, hydraulic schematics, technical specifications, servicing and troubleshooting procedures for the pumps. The gear pump failure states, that occurred most often, were identified in chapter 3. Change oil as recommended by your implement or tractor manufacturer.
As the gears come out of mesh on the inlet side, liquid is drawn into the pump. So if you want to kick your hydraulic troubleshooting expertise up a notch, so you can solve hydraulic problems inhouse or get paid moviestar money to do so for others, and have me personally coach and advise you along the way, then dont fiddle around, secure your copy of the definitive guide to hydraulic troubleshooting today. The inclusion of adequate test points for pressure readings, although not essential for operation, will expedite troubleshooting. Try to set preconceived ideas of what could be wrong aside and base your statement on facts that are accurate and unbiased.
Hydraulic pump harness wiring information 19941998 811245. When pumping, hydraulic and mechanical forces tend to separate the gears and force the gear tips against the walls. If your system is suffering from any of these symptoms, then that could be a clear sign that you need to repair, clean, or replace parts of your system. The catalogue highlights the range of aluminum and cast iron gear pumps and motors available from sauerdanfoss. If the pump is rotated in the wrong direction, adequate fluid will not fill the suction port due to the pumps internal design. Hydraulics 101 for beginners tractor supply company. Logical troubleshooting in hydraulic systems is intended as a guide to. Troubleshooting tips for hydraulic pumps womack machine. Take, for example, a system that runs a 16 cm3 gear pump at 1450 rpm, and, say, the system pressure cant go higher than 100 bar because the pump is severely wornout. For lubrication, the gear pump uses a small amount of oil from the pressurized side of the gears, bleeds this through the hydrodynamic bearings, and vents the same oil. For lubrication, the gear pump uses a small amount of oil from the pressurized side of the gears, bleeds this through the. Albany gear pumps are available in many configurations, whilst they may look the.
Try this simple tip before you blame your gear pump for. Because of this, the following points should be considered. A bar which drives the piston back and forth through the chamber of the cylinder. Pump fault mcc or standby pump fault mcc identified by pump motor output gives alarm to control desk if that pump. Troubleshooting guide continued troubleshooting guide part 2 problem possible cause corrective action rapid pump wear abrasives in fluid install suction strainer. Whether youre looking for hydro gear transaxles, such as hydro gear zt3100, zt2800 among others. When a hydraulic system has problems, it is common practice to first look at the pump.
Leveling using touch pads 5000089, 500105, 500210 500456, 500535 82l004001. Some gear pumps can be rotated in either direction, but most have an arrow on the housing indicating the direction of rotation. Electro hydraulic leveling troubleshooting and service manual 82l0506 hyd. On each page, youll find a table highlighting some of the common problems with recommendation. 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. However, we dont want you to have to make the trip in with your part unnecessarily. 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.
Faulty or dirty flow control or other feed related valve. This occasionally happens with suspected gear pump failures. Criterial quantities providing the wear symptoms identification of tested pumps, were separated during the pump characteristics empirically obtained analysis. Loose inlet on gear pump air being introduced into hydraulic system gear pump not priming da remove relief valve operate pump for a few seconds until fluid comes out of port replace relief valve. The gpm of the fixed displacement pump can not be varied. The damage occurs to both the housing and gear surfaces. Apr 11, 2014 pg330 pg331 tutorial01 cast iron gear pump salami spa duration. When using a gear pump a pressure relief valve must be fitted to protect the pump if deadheaded against a closed valve or blockage. Basically, the flow meter will show the loss of oil flow at different pressures. Hydraulic gear pump and motor failure analysis and repair guide.
We love having folks bring in worn or damaged parts and ask us to help them figure out the possible causes of the problem. A term commonly used to refer to the rod and piston within a cylinder. In any troubleshooting situation, no matter how simple or complex the hydraulic system, always start with the basics. A relief or bypass in your hydraulic system is necessary to prevent pump from breakage due to overpressurization. The series 26 gear pump has been designed to retrofit equipment using the b1 and b2 gear pumps. The outlet pressure high pressure, p s, is incident on the end of the compensator valve spool. 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. The prv can be piped back to the suction side of the pump or into the supply tank. Available in a wide variety of sizes and configurations to suit your application needs.
Replaced hydro pumpmotor and cannot get it to bleed. Volumetric efficiency of gear pumps at 90% is lowest of the three pump types. The p series pumps normally will not require servicing during the life of the vehicle in which it is. Dc power unit troubleshooting guide kti hydraulics, inc. Like the vane pump, an axial piston pump can be configured as a pressurecompensated pump fig. A gear pump uses the meshing of gears to pump fluid by displacement. Pump rotation should always be viewed from the shaft end. Turn to the best for your next gear pump repair or overhaul. Service provider of hydraulics gear pump repair service commercial intertech hydraulic pump, commercial hydraulic pump repair services, dowty gear pump and sauerdanfoss hydraulic gear pump offered by hydro hydraulic marine equipment services private. Hydraulics determining pump displacement gear pump vane pump w l d w l d 1. Pump outlet pressure is increased and a pressure drop is created across the orifice.
General gear pumps and gear motors technical information. This is because the hydraulic gear pump is one of the main components used in manufacturing, con. Take temperature readings at the pump, pump case, and various valves to. Checklist of problems vvith centrifugal pumps and their causes centrifugal pumps are one of the worlds most commonly used devices. If the thrust plate remains in the gear housing, remove as described in step 3. Checklist of problems vvith centrifugal pumps and their causes. Adjust relief valve to manufacturers specification. Demonstrative drawing of the pz2 type gear pump structure. Hydraulic gear pump and motor failure analysis and repair guide page 2 of 32 alamo industrial 1502 e walnut st, seguin, tx 78155. The pump pressure will increase until it overcomes the differential spring force and shifts the spool to direct control oil into the servo piston and destroke the pump.
The pumps will stop automatically if the level drops to the shutdown level. Detailed specifications are included for all products. Permco is a leading manufacturer of highpressure hydraulic gear vane pumps and motors, flow dividers, intensifiers, and accessories. Hydraulic gear pump and motor failure analysis and repair. Pdf format this file type includes high resolution graphics and schematics when applicable. Hydraulics gear pump repair service commercial intertech. A horizontal, doublesuction pump may be fitted with a 90deg elbow mounted on the suction nozzle in such a way that the line leading to the elbow is parallel with the axis of the pump shaft see figure 1.
When start solenoid not shown is activated power is provided to dc motor 124515 which turns gear pump pl2. 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. Internal gear pumps generate flow using a gear with externallycut teeth contained in and meshed with a gear with internallycut teeth. All types of hydraulic motors have common design features. Hydraulic pump motor 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. Hydraulic pumps fixed displacement pumps the gpm of the fixed displacement pump can not be varied. Use correct fittings and proper oil as noted in this technical service manual. In figure 2, the pump swashplate is in the vertical position, which means the pump output is zero gallons per minute gpm.
Hydraulic pump motor division in this view the variable orifice is restricting pump flow. Troubleshooting hydraulic pumps machinery lubrication. Hydraulics trouble shooting guide advanced fluid systems. The correct way to test the hydro system would be use a bidirectional flow meter. Understanding and troubleshooting hydrostatic systems. 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. General gear pumps and gear motors technical information general information sauerdanfoss offers a wide range of gear products to meet most application needs. Its not a hydro gear, it is a separate pump motor unit. If your hydraulic layout is suffering from any issues, make sure to check your hydraulic gear pumps and other components. Troubleshooting tips for hydraulic pumps download data sheet 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. For example, an inadequate size filter on the inlet of a pump can cause cavitation and subsequent damage to the pump. We were incorporated by his son, richard, in september of 1950 when a contract to produce 100 custom hydraulic cylinders was landed. Vane pumps generally are quieter than piston and gear pumps. Qx double pumps consits of two single pumps mounted on a common drive shaft.
When troubleshooting an internal gear pump or any other pump for that matter, develop a clear, concise, and objective statement of the problem. The basic function of a hydraulic pump is to take fluid that is provided at the inlet and discharge it through the outlet into a hydraulic system. This results in only 8,000 hours of service life, which is too low. A pump that displaces an exact amount of fluid per revolution, such as a gear, vane, or piston pump. Condition likely cause correction muncie power products. Outline of the gear pump a gear pump is a kind of rotary pump and is defined as a positive displacement pump. Positive displacement pump problems 5 overview of pump problems typically found on positive displacement pumps. The liquid is forced out the discharge port by the meshing of the gears. Aluminum and cast iron gear pumps and motors, flow dividers, variable displacement piston pumps, electronic controls and filters.
Knowing the system probably the greatest aid to troubleshooting is the confidence of knowing the system. We are facing cavitation problems in the lubricating oil gear pumps. A high percentage of pump problems are on the suction side with viscous liquids, pressure drop due to friction losses adds up quickly long suction lines and narrow piping diameters on the pump suction often lead to problems with insufficient npsh 27. Relief valves and fixed displacement pumps provides a flow path for the pump volume back to tank. Hydraulic troubleshooting is one of our specialties here at bernell hydraulics. If you cant find the answer, contact us and well help. Prince manufacturing corporation traces its roots to a small machine shop by john prince in 1941. You will also spot hydro gear pumps, filters, seal kits, and transmissions with parts lookup. These pumps create pressure through the meshing of the gear teeth, which forces fluid around the gears to pressurize the outlet side. The swashplate is moved by two internal cylinders, which are controlled by a separate valve or manual lever. L2550 hydraulic power steering pump failure, pump opened to show damage. What are the possible reasons for gear pump cavitation.
If you are facing problems in working conditions, the troubleshooting tables for vane pumps and vane motors in. The usual story is the machine has lost pressure and, of course, the gear pump is the primary suspect. Ive put it back and forth, wide open frontwards, wide open reverse, valve open, valve shut, fittings at the wheel motor cracked open while running to bleed out. Typically, gear pumps are used at pressures up to about 150 bar and capacities of around 150 gpm 6751 min1. Hydraulic pump troubleshooting guide no oil flow from pump. What does the pump sound like when it is operating normally. Coastal hydraulics is the shop of choice for hydraulic system and component repairs. In addition to supplying the products in our catalogs, we develop customized solutions in close collaboration with our customers. Extra shafts, porting, and mounting configurations, as well as available displacements, give you the choices you need for an easy conversion to this superior pump. A pistontype pump is always used in a hydrostatic system. Hydraulic system troubleshooting 45 conversion tables 48. This pressure multiplied by the area of the spool gives a hydraulic force, fh, which is opposed by the spring force, f s, produced by the. Troubleshooting and preventive maintenance of hydraulic. Centrifugal pumps develop pressure by increasing the velocity of the liquid liquid is literally flung out of the cutwater.
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. They are one of the most common types of pumps for hydraulic fluid power applications. P series hydrostatic pumps service and repair manual. Pump test procedure for evaluation of antiwear fluids for mobile systems. The pump volume can range from zero to the maximum amount. Gear pumps make good chemical additive dosing pumps provided material compatibility issues are addressed. Installation, operation, maintenance user instructions user instructions 71569246 2167be1.
Mechanicalmisalignment, sticky, warped, or binding ways, b ent bracket or other mechanical failures. Gear pump manual original instructions albany pumps. We continue to make custom hydraulic cylinders, valves and pumps serving a wide variety of markets. Inspections for possible problems with gear pumps download. Check level, color, quality and cleanliness of fluid and act accordingly. Gear pump division youngstown, oh 7 remove the drive gear connecting shaft. Each component in the system must be compatible with and form an integral part of the system. Gear pumps are roughly classified into external and internal gear types. The pump is arguably the heart of almost every hydraulic system and, as such, has traditionally been blamed for almost every operating problem. At hydro gear parts youll find the best replacement for your mower or any outdoor equipment. Additionally, continued wear due to the introduction of large contaminants results in additional contaminants, which perpetuates the overall problem.
445 592 27 1567 87 654 1046 84 47 234 1185 1488 1550 334 1393 919 76 362 160 586 976 1218 158 73 1122 1210 890 728 715 1200 966 1225 1223 396 607 324 211 914 996 2 187 85