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