what size hydraulic pump do i need in stock

The goal of a hydraulic pump is to move hydraulic fluid through a hydraulic system, acting much like the beating heart of the system. There are two things that all hydraulic pumps have in common: (1) they provide hydraulic flow to other components (e.g., rams, hydraulic motors, cylinder) within a hydraulic system, and (2) they produce flow which in turn generates pressure when there is a resistance to flow. In addition, most hydraulic pumps are motor-driven and include a pressure relief valve as a type of overpressure protection. The three most common types of hydraulic pumps currently in use are gear, piston, and vane pumps.

In a gear pump, hydraulic fluid is trapped between the body of the pump and the areas between the teeth of the pump’s two meshing gears. The driveshaft is used to power one gear while the other remains idle until it meshes with the driving gear. These pumps are what is known as fixed displacement or positive displacement because each rotation of the shaft displaces the same amount of hydraulic fluid at the same pressure. There are two basic types of gear pumps, external and internal, which will be discussed in a moment.

Gear pumps are compact, making them ideal for applications that involve limited space. They are also simple in design, making them easier to repair and maintain. Note that gear pumps usually exhibit the highest efficiency when running at their maximum speed. In general, external gear pumps can produce higher levels of pressure (up to 3,000 psi) and greater throughput than vane pumps.

External gear pumps are often found in close-coupled designs where the gear pump and the hydraulic motor share the same mounting and the same shaft. In an external gear pump, fluid flow occurs around the outside of a pair of meshed external spur gears. The hydraulic fluid moves between the housing of the pump and the gears to create the alternating suction and discharge needed for fluid flow.

External gear pumps can provide very high pressures (up to 3,000 psi), operate at high speeds (3,000 rpm), and run more quietly than internal gear pumps. When gear pumps are designed to handle even higher pressures and speeds, however, they will be very noisy and there may be special precautions that must be made.

External gear pumps are often used in powerlifting applications, as well as areas where electrical equipment would be either too bulky, inconvenient, or costly. External gear pumps can also be found on some agricultural and construction equipment to power their hydraulic systems.

In an internal gear pump, the meshing action of external and internal gears works with a crescent-shaped sector element to generate fluid flow. The outer gear has teeth pointing inwards and the inner gear has teeth pointing outward. As these gears rotate and come in and out of mesh, they create suction and discharge zones with the sector acting as a barrier between these zones. A gerotor is a special type of internal gear pump that eliminates the need for a sector element by using trochoidal gears to create suction and discharge zones.

Unlike external gear pumps, internal gear pumps are not meant for high-pressure applications; however, they do generate flow with very little pulsation present. They are not as widely used in hydraulics as external gear pumps; however, they are used with lube oils and fuel oils and work well for metering applications.

In a piston pump, reciprocating pistons are used to alternately generate suction and discharge. There are two different ways to categorize piston pumps: whether their piston is axially or radially mounted and whether their displacement is fixed or variable.

Piston pumps can handle higher pressures than gear or vane pumps even with comparable displacements, but they tend to be more expensive in terms of the initial cost. They are also more sensitive to contamination, but following strict hydraulic cleanliness guidelines and filtering any hydraulic fluid added to the system can address most contamination issues.

In an axial piston pump, sometimes called an inline axial pump, the pistons are aligned with the axis of the pump and arranged within a circular cylinder block. On one side of the cylinder block are the inlet and outlet ports, while an angled swashplate lies on the other side. As the cylinder block rotates, the pistons move in and out of the cylinder block, thus creating alternating suction and discharge of hydraulic fluid.

Axial piston pumps are ideal for high-pressure, high-volume applications and can often be found powering mission-critical hydraulic systems such as those of jet aircraft.

In a bent-axis piston pump (which many consider a subtype of the axial piston pump), the pump is made up of two sides that meet at an angle. On one side, the drive shaft turns the cylinder block that contains the pistons which match up to bores on the other side of the pump. As the cylinder block rotates, the distances between the pistons and the valving surface vary, thus achieving the necessary suction and discharge.

In a radial piston pump, the pistons lie perpendicular to the axis of the pump and are arranged radially like spokes on a wheel around an eccentrically placed cam. When the drive shaft rotates, the cam moves and pushes the spring-loaded pistons inward as it passes them. Each of these pistons has its own inlet and outlet ports that lead to a chamber. Within this chamber are valves that control the release and intake of hydraulic fluid.

In a fixed displacement pump, the amount of fluid discharged in each reciprocation is the same volume. However, in a variable displacement pump, a change to the angle of the adjustable swashplate can increase or reduce the volume of fluid discharged. This design allows you to vary system speed without having to change engine speed.

When the input shaft of a vane pump rotates, rigid vanes mounted on an eccentric rotor pick up hydraulic fluid and transport it to the outlet of the pump. The area between the vanes increases on the inlet side as hydraulic fluid is drawn inside the pump and decreases on the outlet side to expel the hydraulic fluid through the output port. Vane pumps can be either fixed or variable displacement, as discussed for piston pumps.

Vane pumps are used in utility vehicles (such as those with aerial ladders or buckets) but are not as common today, having been replaced by gear pumps. This does not mean, however, that they are not still in use. They are not designed to handle high pressures but they can generate a good vacuum and even run dry for short periods of time.

There are other key aspects to choosing the right hydraulic pump that goes beyond deciding what type is best adapted to your application. These pump characteristics include the following:

Selecting a pump can be very challenging, but a good place to start is looking at the type of pump that you need. Vane pumps have been largely replaced by compact, durable gear pumps, with external gear pumps working best for high pressure and operating speeds while internal gear pumps are able to generate flow with very little pulsation. However, vane pumps are still good for creating an effective vacuum and can run even when dry for short periods of time. Piston pumps in general are more powerful but, at the same time, more susceptible to contamination.

Whether the pump is needed for the rugged world of mining, the sterile world of food and beverage processing, or the mission-critical aerospace industry, MAC Hydraulics can assist you with selecting, installing, maintaining, and repairing the right pump to meet the needs of your hydraulic system. In the event of a breakdown, our highly skilled technicians can troubleshoot and repair your pump — no matter who the manufacturer happens to be. We also offer on-site services that include common repairs, preventative maintenance, lubrication, cleaning, pressure testing, and setting.

Log splitters are designed with a simple process in mind: to split logs efficiently. To do so, almost all use a hydraulic system to pressurize the driving force of the splitting wedge. When you purchase a log splitter, you don’t have to worry much about the individual parts other than for basic maintenance needs and cleaning purposes.

But if you are interested in building your own log splitter, which is a very realistic option due to the simplicity of the machinery, then you do need to know what parts are best for effective splitting power. Gas and electric splitters utilize a hydraulic pump which is the integral component of hydraulic power. If you were wondering what size hydraulic pump for a log splitter you need, this article explains below its use and what to look for.

Log splitters are powerful machines that provide a splitting pressure to logs of various sizes. Almost all splitters use hydraulics whether it is pressurized via an electric, gas, or manual power source. These hydraulics feed a splitting wedge of your model of choice to make short work of just about any size log you you need to cut down to size.

One of the simplest hydraulic systems you can find in use is a log splitter. The basics of hydraulic pressure utilize an engine, oil pump to create oil pressure, a hydraulic cylinder that works with a valve for splitting power, and tank to hold and feed oil through the system.

If you are serious about making your own backyard log splitter, then you want to have, at a minimum, the following components to provide the right amount of force and power for basic splitting of averaged sized, seasoned logs:

But you may want a bit more force for heavier workloads, which is why I’ve explained below how a pump can help determine your splitter’s speed, and influence the cutting force. Read more about how a log splitter works, how to care for it, and what you need to build your own.

Mentioned multiple times above is the use of a two-stage pump that is most common for a hydraulic log splitter system. This is because it uses two different sets of gears doing the pumping to keep you machine running smoothly and providing the power you need at the speed you desire.

Although a two-stage pump is the best option for your log splitter, you can manipulate the amount of force it exerts through which size cylinder you choose. To calculate your own splitter’s force and speed based on the choices you make, you can use this handy calculator tool.

The entire splitting system is dependent upon the pump that consists of two pumping sections and an internal pressure sensing valve. One of these sections generates the maximum flow rate rated at at lower pressure that is used to draw the piston back for the system to reset after splitting. The other section provides the highest possible pressure to generate maximum splitting force.

Knowing the maximum pressure generated by a pump determines the splitting powerof the pump, and one thing you will notice is that most companies are fairly generous in their tonnage claims and round up more often than not. To figure the tonnage provided by the splitter, simply multiple the maximum pressure of the pump (a two-stage pump applies about 3,000 PSI), by the total surface area of the piston in square inches. The resulting number is the total available pressure.

You also can determine the cycle time of a piston to figure how quickly you can work through a pile of logs. To move a 4 inch piston 24 inches (the common piston length) you need 301 cubic inches of oil. Since a gallon of hydraulic fluid takes up 231 cubic inches, you need to pump, at a minimum, 1.5 gallons of fluid to push the piston in one direction.

The flow rate of the pump is dependent on the size of the engine powering the system. If your engine is capable of providing an 11 gallon per minute rate, then it will take approximately 20 to 30 seconds to cut, and around 10 seconds to reset. Common horsepower minimum requirements for a two-stage pump are:

For a dependable machine, you want to incorporate a two-stage pump to work with whatever size engine and cylinder you decide upon for cutting wood. These keep your splitter working smoothing and efficiently, and allow you to dictate speed and force to handle whatever size job you have in mind. If you have any further questions, or want to add to this information, please do so below. And, as always, please share.

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Knowing how to right-size an electric motor for your hydraulic pump can help reduce energy consumption and increase operational efficiency. The key is to ensure the pump motor is operating at peak continuous load. But how can you know how much power is needed?

Before you can choose the correct electric motor, you must know how much horsepower (Hp) is required to drive the pump shaft. Generally, this is calculated by multiplying the flow capacity in gallons per minute (GPM) by the pressure in pounds per square inch (PSI). You then divide the resulting number by 1714 times the efficiency of the pump, for a formula that looks like this:

If you’re not sure how efficient your hydraulic pump is, it is advisable to use a common efficiency of about 85% (Multiplying 1714 x 0.85 = 1460 or 1500 if you round up). This work-around simplifies the formula to:

The above formula works in most applications with one notable exception: If the operating pressure of a pump is very low, the overall efficiency will be much lower than 85%. That’s because overall efficiency is equal to mechanical efficiency (internal mechanical friction) plus volumetric efficiency.

Internal friction is generally a fixed value, but volumetric efficiency changes depending on the pressure used. Low-pressure pumps have high volumetric efficiency because they are less susceptible to internal leakage. However, as the pressure goes up and internal fluids pass over work surfaces such as pistons, port plates, and lubrication points, the volumetric efficiency goes down and the amount of torque required to turn the pump for developing pressure goes up.

This variance makes it very important to know the efficiency of your pump if you’re using it at low pressure! Calculations that do not take low pressure into account will lead to a failed design.

If you calculate 20 GPM @ 300 PSI with an assumed overall efficiency of 89%, you would probably select a 5 Hp electric motor. However, if you calculate the same 20 GPM @ 300 PSI with the actual overall efficiency of 50%, you would know that you should be using a 7.5 Hp motor. In this example, making an assumption about the efficiency of your pump could result in installing a motor that is too large, driving up your overall operating cost.

There are many contributors to the overall efficiency of a hydraulic pump, and it pays to be as accurate as possible when choosing a motor. A best practice for proper sizing is to use published data from the pump vendor that shows actual input torque vs. pressure or overall efficiency vs pressure. Note that efficiency is also affected by RPM.

Identifying a right-sized motor for your hydraulic pump does not always ensure you are using the most efficient motor. Be sure to read Part 2 of this post to learn how RMS loading and Hp limiting can help you scale down the size of your electric motor to save money while maximizing efficiency.

Whether gear, vane, or piston pump, there may come a time when you have to replace your hydraulic pump. When your equipment isn’t working properly and you have narrowed the problem down to a hydraulic pump that needs to be replaced, what do you need to know?

The pump may simply be worn out—they do have a natural lifespan, as they are a wearable item in a hydraulic system. Although it is not possible to give an average lifespan given the different types of pumps and widely varying hours of operation; in general, you can expect many years of good operation from a hydraulic pump in most truck-mounted hydraulic systems. However, the life of a hydraulic pump might be much longer than what you are experiencing. Here are some questions you should ask:

Has the equipment been operating acceptably with this pump for a number of years without incident, and has the decline in performance been gradual over a longer period of time?

In this case, you’ll need to get the pump make and model number so that you can make sure that your replacement will be correct—either with an exact replacement or with another make that has the same operating specifications.

In any case, when replacing a failed hydraulic pump you will want to make sure to use this opportunity to also change out your hydraulic fluid (or at the very least use a filter cart and filter your oil). In the process of failing, your pump has introduced contaminants into your hydraulic system that you want to remove before they damage your new pump or any other hydraulic component. You will want to change your filter element(s) when you install your new pump, and then change it (them) out after a break-in period on your new pump.

If not, then let’s make sure there is not something else going on, or you may just find yourself replacing pumps frequently because the underlying problem hasn’t been addressed.

Input shaft is twisted/bcanroken: This occurs due to an extreme shock load to the pump. Typically, this happens when a relief valve is missing from the system, not functioning correctly, set to a much higher value than what the pump can withstand, or is too small for the system flow and thus cannot function correctly.

Shaft fretting:Fretting corrosion occurs under load in the presence of repeated relative surface motion, for example by vibration. Direct mount pump splines can be worn away. The solutions include:

Using larger pump and PTO shafts will not eliminate fretting, but may resolve the problem because of the increased metal available before the failure occurs.

Check to see that there is a sufficient amount of oil in the reservoir. Not just when the system is at rest, but also when all cylinders are extended to their maximum length or when all the components are running.

Make sure that the pump is able to get a good flow of oil from the reservoir—pumps are designed to have the oil feed pushed to the pump by gravity and atmospheric pressure, not by “sucking” oil. If the oil level in the reservoir is lower than the inlet of the pump, or the run too long or uphill, oil may not flow adequately to the pump. You can check if the pump is receiving oil adequately by using a vacuum gauge at the pump inlet. For a standard gear pump, at maximum operating RPM, the gauge should read a maximum of 5 inches HG. Larger numbers will damage a gear pump, and if you have a piston pump, the maximum number will be lower for good pump life.

Over pressurization: Pressure relief settings may have been adjusted or changed, and are now higher than what the pump can withstand without causing damage.

Pumps don’t produce pressure, they produce flow and are built to withstand pressure. When the system pressure exceeds the pump design, failure begins—either gradually or catastrophically.

When installing the new pump, back all the relief settings off. Then with the use of a pressure gauge T’d in at the pump outlet, gradually adjust the pressure relief setting until a cylinder or motor begins to move. Once the cylinder has reached the end of its stroke, gradually increase the pressure relief setting until reaching the max system pressure (which would be the pressure rating of the lowest rated component in the system). Sometimes, if a pump has been replaced and is larger than the original (produces more flow), the relief may not be able to allow all the flow being produced to escape back to tank. When that happens, the relief valve is “saturated” and the effect is the same as having no relief in the system. Pressures can reach levels much higher than the relief settings and components can be damaged or destroyed.

Contamination: Over time, the system oil has gotten dirty or contaminated and no longer is able to lubricate the pump, or is carrying contamination to the pump.

Make sure the oil is clean, the oil filer changed on schedule, and that there are no entry points for contamination like water, dust, or dirt from a reservoir filler cap that is unfiltered or missing, seals in motors or cylinders that are allowing contaminants in, etc.

New hoses can contain leftover bits of rubber and metal particles from the cutting and crimping process and should be cleaned out before installation.

Even new oil may be quite dirty if stored incorrectly, or exposed to dust and dirt. It’s always a good idea to use a filter cart and filter the system once it’s refilled with oil before turning on the system.

This 2-Stage pump fits a wide variety of log splitters and outdoor power equipment and works in both horizontal and vertical orientations. The inlet (suction) port is 1" NPT and the minimum suction hose inner diameter (ID) is 1-1/4". The inlet barbed fitting is not included but is available separately. Use a 1-1/4 ID Suction Hose and 3/4" ID high-pressure hose.

Rated for up to 3,000 PSI at 3,600 RPM, this pump can power log splitters from 5 to 37 tons, depending on the inner diameter of the hydraulic cylinder. It features a fast cycle time by moving quickly when unloaded.

Be sure to use AW-32 10-Weight (ISO 32) or AW-46 20-Weight (ISO 46) light hydraulic fluid. This pump is not designed for use with “universal” or "tractor" transmission oil, such as "303". The use of incorrect fluid may damage the pump and void the warranty.

Make sure the hydraulic fluid reservoir is not below the pump to ensure a sufficient flow of fluid to the pump. The hydraulic fluid reservoir should have a capacity of at least 12 gallons to allow sufficient cooling. Suction-side filtration should be no finer than 150 microns. The use of a 10-25 micron filter on the suction side of the pump is too restrictive and will cause failure.

We recommend using an L-style jaw coupling to connect the pump to an engine. Couplings and mounting brackets are available. You should use at least an 11.7hp 390cc engine to maintain 3,600 RPM under load.

This 2-Stage pump fits a wide variety of log splitters and outdoor power equipment and works in both horizontal and vertical orientations. The included inlet nipple requires a 1" inner diameter suction hose.

Rated for up to 3,000 PSI at 3,600 RPM, this pump can power log splitters from 5 to 35 tons, depending on the inner diameter of the hydraulic cylinder. It features a fast cycle time by moving quickly when unloaded. It automatically shifts to low-flow/high-pressure mode at 500 PSI.

Be sure to use AW-32 10-Weight (ISO 32) or AW-46 20-Weight (ISO 46) light hydraulic fluid or Dexron III automatic transmission fluid. This pump is not designed for use with “universal” or "tractor" transmission oil, such as "303". The use of incorrect fluid may damage the pump and void the warranty.

Make sure the hydraulic fluid reservoir is not below the pump to ensure a sufficient flow of fluid to the pump. Suction-side filtration should be no finer than 150 microns. The use of a 10-25 micron filter on the suction side of the pump is too restrictive and will cause failure.

We recommend using an L-style jaw coupling to connect the pump to an engine. Couplings and mounting brackets are available. You should use at least a 5hp 163cc engine to maintain 3,600 RPM under load.

Constructed of high strength aluminum housing and cast iron end covers. High performance, high efficiency at low and high speed operation, low noise. Keyway size 3/16’’ 3/4’’ Dia. Straight Keyed Shaft 1 1/4’’ Long.

Constructed of high strength aluminum housing and cast iron end covers. High performance, high efficiency at low and high speed operation, low noise. Keyway size 3/16’’ 3/4’’ Dia. Straight Keyed Shaft 1 1/4’’ Long.

During the historic forecast period in 2019, the hydraulic pumps market analysis shows that the market was valued at a revenue figure worth USD 4.13 billion. During the current period, the market experts and industry leaders predict that for the ongoing forecast period of 2022-2030, the market is expected to grow at a global CAGR of 6.25% during the period and reach a final market value worth USD 14.83 billion.

Research for aerosolized insulation that helps in inhalation or oral insulation alongside the availability of hydraulic-producing pumps and stem cell explanations are likely to help the market with the help of growth opportunities and positive attributes during the forecast period. As a result, the Medtronic hydraulic pumps market share is expected to grow substantially and emerge as one of the dominant market players during the forecast period that ends in 2030. Furthermore, the infrastructural developments, automation across industries, such as manufacturing and automotive, and increased construction activities will drive the growth prospects for hydraulic pumps until the forecast period.

Government regulations focused on reducing CO2 emissions and increased awareness about energy saving have led to the expansion of this market. However, with the costs of energy steadily rising, energy consumption is playing a more significant role than ever in the total cost of machine operation.

The pandemic is a time of distress as the public healthcare emergency is so big that the market players and established companies face losses as they are having a hard time keeping up with the changing trends and lifestyle preferences of the target audience located in various regions across the globe. The pandemic is a situation like never before, and hence, the businesses, corporates, enterprises, manufacturing and production units, startups, and the common man. The healthcare systems of developed countries are on the verge of collapsing. The healthcare service providers are witnessing major struggles and issues that hamper large-scale businesses" working and production and manufacturing units. This further results in the unavailability of resources and labor that hamper the smooth functioning of the demand and supply chain mechanism of the global market operations during the forecast period that ends in 2030.

The global governments understand the misery of the market players and, hence, ease the restrictions that will help better function the hydraulic pumps market players and generate a demand that helps in returning to the normalcy rate that was before the pandemic hit in 2019-2020. Also, the key market players are investing in product development and launch at a larger scale that will help the market add innovation and creativity for the target audience and push for growth opportunities during the ongoing forecast period of 2022-2030.

The global rise in population is witnessing an increase in obese people and its connection with the genetic factors related to type-2 diabetes. Also, the increase in the number of patients who have type-1 diabetes is likely to present the market with growth opportunities that will help enhance the hydraulic pumps market share during the forecast period of 2030.

The demand for type 1 diabetes hydraulic pumps is already high amongst the people suffering from the same on the global scale. In addition, there is a significant growth in type 2 patients. Also, the ratio of children to adults and the rise in types 1 and 2 shows excellent opportunities for growth across various countries during the forecast period of 2030.

However, one of the significant factors that are likely to develop restraints that will bar the market from growing as per the predictions is a lack of awareness regarding hydraulic pumps. Also, the ones who are aware face difficulties in the form of low spending power or the price not matching their budget. There are fewer options available for people to buy these pumps on a budget, and hence, there is an urgent need for the market players to opt for cheaper yet qualitative alternates. Although the initial cost of assembling the pump is low, the cost of maintenance over the entire lifespan is high, which is a challenging factor. The salvage value of the parts decreases over time too, which restrains the companies from buying new pumps.

Hydraulic pumps, particularly gear pumps, are primarily used in construction. In addition, in both developed and developing countries, manufacturers are increasing their investments in machine tools to enhance their production processes and systems. The rise in construction activities coupled with increased construction spending across various countries contributes to advancing the market. For instance, according to a survey by World Bank, construction spending is estimated to reach a market value worth USD 11.9 trillion by 2020.

Due to the pandemic, the hydraulic pumps market operations have undergone a lot of suffering. Hence, the report aims to understand the changing dynamics related to the drivers, opportunities, and restraints that will lead the market towards growth as predicted by the industry experts for the forecast period between 2022-2030.

The global Hydraulic Pumps Market report aims to help and study the scope of the market and the ability of the market players to cater to the rising and vibrant needs of the target audience that is spread in various regions across the globe. Also, the report aims to highlight the availability of resources and equipment to the domestic market based on these segments.

The global Hydraulic Pumps Market report helps to draw a competitive graph amongst the rising efforts and results witnessed by the prominent players of the market and also discuss the development of scenarios and advent of technology that will enhance the ability of the market to grow as per the predictions during the forest period that ends in 2030.

Based on the need of the investors to have an idea about the future of hydraulic pumps, the market is studied based on the performance of its segments for an array of target audiences in the global scenario. As a result, the market has been segmented based on the following:

The hydraulic pumps market has been segmented based on the end-user vertical and includes the construction sector, mining, machinery, agriculture, oil and gas, and many others like the automotive sector.

The resource and audience distribution for the hydraulic pumps market trends show that the market has been divided into 4 significant segments: the APAC region, North America, Europe, and the rest of the world.

The hydraulic pumps market share is expected to be the maximum in the Asian Pacific market. Agriculture is placing the most significant demands on water in Asia and the Pacific, as rising populations, rapid urbanization, and energy, industrial, and domestic use have left water stocks in a critical state.

Most of the Asian countries rely heavily on groundwater for farming. Around 80% of Asia"s freshwater is used to irrigate crops, much of which is used inefficiently.

Hydraulic pumps use fewer moving parts through the mechanical and electrical systems. Thus they become more straightforward to maintain. The water flow can be sped up, slowed down, or stopped using simple controls, which becomes easy for farmers.

In June 2019, one of the market companies - Allegro Funds had agreed on terms to invest in Questas Group, a company founded more than 20-years ago and provides hydraulic, irrigation, pump, and engineering solutions to the mining, construction, agricultural and general industrial sectors.

In June 2019, the prominent submersible pumps manufacturer HOMA Pumpenfabrik GmbH unveiled a new submersible motor agitator with an optimized propeller hub to minimize dead flow zones and prevent clogging.

In March 2018, another market company - Kawasaki Precision Machinery at Hannover Messe highlighted the electro-hydraulic hybrid system, KAWASAKI ECO SERVO, for industrial applications. This new system combined the best Kawasaki technology to bring excellent controllability and high efficiency to applications, such as press machines, injection molding machines, and steel manufacturing.

The report highlights the market dynamics and the role of technology in helping the market grow as per the industry experts" predictions. The report also covers the performance of various market segments in different global regions and the rising competition resulting from the recent developments undertaken by the players in the forecast period of 2022-2030.

Note:  This information is provided as a quick reference resource and is not intended to serve as a substitute for qualified engineering assistance.  While every effort has been made to ensure the accuracy of this information, errors can occur.  As such, neither Flodraulic, any of its affiliated companies nor its employees will assume any liability for damage, injury or misapplication as result of using this reference guide.

Star Hydraulics & Pneumatics, LLC. builds three types of manually operated pumps - single piston pumps, two-speed pumps, and double-acting pumps. Pumps with 4-way valves are also offered. Your application determines which type of pump to select. At Star Hydraulics, LLC our pumps are robust, solidly built by combining established designs with some of the latest equipment meticulous workmanship and high quality standards. In fact, one of our customers was kind enough to return a pump to us after being used for more than 40 years and it looks like it was almost new.

If there is initially little or no resistance, but high force is needed later, use the two-speed dual piston pump. An example of this would be a press in which a cylinder advances until it contacts a load and then applies a much greater bending or cutting force. The dual piston pump supplies high volume, low pressure flow until the increased force is needed, at which time it automatically switches to high pressure, lower volume.

Light hydraulic oil is recommended for use with Star Hydraulics, LLC pumps. Oils with SUS viscosity of 75 to 150 at 100°F will give satisfactory performance (ISO grade 15, 22, or 32). In an emergency situation when above oils are not available, use 5w or 10w motor oil or automatic transmission fluid. Unless there is a specific need to do so, Star pumps are shipped without oil.

A Star pump is well-made and robust. It is expected to work in tough environments. Because of that exposed surfaces of standard pumps are painted with industrial quality paint. Pumps painted with special colors with two coat finishes, or with prime coat only, and pumps with special plated or polished parts are also available.

In order to provide for continuing product improvement, Star Hydraulics,LLC may make design changes that affect the data provided on this web site. Contact the factory for the most current specifications.

It is important to keep the pump clean and well-maintained and follow operating guidelines for best operation and longevity. It is best to keep the pump clean and keep foreign materials away from the piston area so that the surface does not get damaged. Use the proper oil and do not let the reservoir run dry. Do not exceed the pressure ratings on pumps that do not have an overload relief valve and take care when adjusting or re-setting pumps that have an overload valve.

If you find that you need to replace the seals on a pump, Star provides repair/replacement kits for each pump along with service instructions on how to replace the seals. If you find that you need assistance during this process, please call us.

Star Hydraulics also provides a repair and rebuilding service for all of our pumps. Just call our customer service to get the return information to send the pump(s) back to our factory.

In addition to the standard pumps that are shown in this catalog, Star will also customize our pumps to meet your requirements. Some general types of customization are:

Star works closely with distributors of our hydraulic products and can put you in touch with a distributor in your area to purchase the accessories necessary to set-up your hydraulic system. If you have special requests, we will be happy to assist you with these accessories.CALCULATING PUMP PRESSURE AND RESERVOIR VOLUME

All Star pumps are covered by a limited warranty on materials and workmanship for one year from the date of manufacture. Star will repair or replace at its option any pump in which Star finds manufacturing defects. In order to get warranty service a pump must be returned to the Star plant freight prepaid with a written explanation of the problem.

Light hydraulic oil is recommended for use with Star pumps. Oils with SUS viscosity of 75 to 150 at 100 degrees Fahrenheit will give satisfactory performance (ISO grade 15, 22, or 32). In an emergency situation when the above oils are not available, use 5 W or 10 W motor oil or automatic transmission fluid.

All exposed surfaces of standard Star pumps are painted with one coat of industrial quality paint. Pumps painted with special colors with two coat finishes, or with prime coat only, and pumps with special plated or polished parts, are also available.

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