what does a hydraulic pump do for sale

There are typically three types of hydraulic pump constructions found in mobile hydraulic applications. These include gear, piston, and vane; however, there are also clutch pumps, dump pumps, and pumps for refuse vehicles such as dry valve pumps and Muncie Power Products’ Live PakTM.

The hydraulic pump is the component of the hydraulic system that takes mechanical energy and converts it into fluid energy in the form of oil flow. This mechanical energy is taken from what is called the prime mover (a turning force) such as the power take-off or directly from the truck engine.

With each hydraulic pump, the pump will be of either a uni-rotational or bi-rotational design. As its name implies, a uni-rotational pump is designed to operate in one direction of shaft rotation. On the other hand, a bi-rotational pump has the ability to operate in either direction.

For truck-mounted hydraulic systems, the most common design in use is the gear pump. This design is characterized as having fewer moving parts, being easy to service, more tolerant of contamination than other designs and relatively inexpensive. Gear pumps are fixed displacement, also called positive displacement, pumps. This means the same volume of flow is produced with each rotation of the pump’s shaft. Gear pumps are rated in terms of the pump’s maximum pressure rating, cubic inch displacement and maximum input speed limitation.

Generally, gear pumps are used in open center hydraulic systems. Gear pumps trap oil in the areas between the teeth of the pump’s two gears and the body of the pump, transport it around the circumference of the gear cavity and then force it through the outlet port as the gears mesh. Behind the brass alloy thrust plates, or wear plates, a small amount of pressurized oil pushes the plates tightly against the gear ends to improve pump efficiency.

A cylinder block containing pistons that move in and out is housed within a piston pump. It’s the movement of these pistons that draw oil from the supply port and then force it through the outlet. The angle of the swash plate, which the slipper end of the piston rides against, determines the length of the piston’s stroke. While the swash plate remains stationary, the cylinder block, encompassing the pistons, rotates with the pump’s input shaft. The pump displacement is then determined by the total volume of the pump’s cylinders. Fixed and variable displacement designs are both available.

With a fixed displacement piston pump, the swash plate is nonadjustable. Its proportional output flow to input shaft speed is like that of a gear pump and like a gear pump, the fixed displacement piston pump is used within open center hydraulic systems.

As previously mentioned, piston pumps are also used within applications like snow and ice control where it may be desirable to vary system flow without varying engine speed. This is where the variable displacement piston pump comes into play – when the hydraulic flow requirements will vary based on operating conditions. Unlike the fixed displacement design, the swash plate is not fixed and its angle can be adjusted by a pressure signal from the directional valve via a compensator.

Flow and Pressure Compensated Combined – These systems with flow and pressure compensation combined are often called a load-sensing system, which is common for snow and ice control vehicles.

Vane pumps were, at one time, commonly used on utility vehicles such as aerial buckets and ladders. Today, the vane pump is not commonly found on these mobile (truck-mounted) hydraulic systems as gear pumps are more widely accepted and available.

Within a vane pump, as the input shaft rotates it causes oil to be picked up between the vanes of the pump which is then transported to the pump’s outlet side. This is similar to how gear pumps work, but there is one set of vanes – versus a pair of gears – on a rotating cartridge in the pump housing. As the area between the vanes decreases on the outlet side and increases on the inlet side of the pump, oil is drawn in through the supply port and expelled through the outlet as the vane cartridge rotates due to the change in area.

Input shaft rotates, causing oil to be picked up between the vanes of the pump which is then transported to pump outlet side as area between vanes decreases on outlet side and increases on inlet side to draw oil through supply port and expel though outlet as vane cartridge rotates

A clutch pump is a small displacement gear pump equipped with a belt-driven, electromagnetic clutch, much like that found on a car’s air conditioner compressor. It is engaged when the operator turns on a switch inside the truck cab. Clutch pumps are frequently used where a transmission power take-off aperture is not provided or is not easily accessible. Common applications include aerial bucket trucks, wreckers and hay spikes. As a general rule clutch pumps cannot be used where pump output flows are in excess of 15 GPM as the engine drive belt is subject to slipping under higher loads.

What separates this pump from the traditional gear pump is its built-in pressure relief assembly and an integral three-position, three-way directional control valve. The dump pump is unsuited for continuous-duty applications because of its narrow, internal paths and the subsequent likelihood of excessive heat generation.

Dump pumps are often direct mounted to the power take-off; however, it is vital that the direct-coupled pumps be rigidly supported with an installer-supplied bracket to the transmission case with the pump’s weight at 70 lbs. With a dump pump, either a two- or three-line installation must be selected (two-line and three-line refer to the number of hoses used to plumb the pump); however, a dump pump can easily be converted from a two- to three-line installation. This is accomplished by inserting an inexpensive sleeve into the pump’s inlet port and uncapping the return port.

Many dump bodies can function adequately with a two-line installation if not left operating too long in neutral. When left operating in neutral for too long however, the most common dump pump failure occurs due to high temperatures. To prevent this failure, a three-line installation can be selected – which also provides additional benefits.

Pumps for refuse equipment include both dry valve and Live Pak pumps. Both conserve fuel while in the OFF mode, but have the ability to provide full flow when work is required. While both have designs based on that of standard gear pumps, the dry valve and Like Pak pumps incorporate additional, special valving.

Primarily used on refuse equipment, dry valve pumps are large displacement, front crankshaft-driven pumps. The dry valve pump encompasses a plunger-type valve in the pump inlet port. This special plunger-type valve restricts flow in the OFF mode and allows full flow in the ON mode. As a result, the horsepower draw is lowered, which saves fuel when the hydraulic system is not in use.

In the closed position, the dry valve allows just enough oil to pass through to maintain lubrication of the pump. This oil is then returned to the reservoir through a bleed valve and small return line. A bleed valve that is fully functioning is critical to the life of this type of pump, as pump failure induced by cavitation will result if the bleed valve becomes clogged by contaminates. Muncie Power Products also offer a butterfly-style dry valve, which eliminates the bleed valve requirement and allows for improved system efficiency.

It’s important to note that with the dry valve, wear plates and shaft seals differ from standard gear pumps. Trying to fit a standard gear pump to a dry valve likely will result in premature pump failure.

Encompasses plunger-type valve in the pump inlet port restricting flow in OFF mode, but allows full flow in ON mode lowering horsepower draw to save fuel when not in use

Wear plates and shaft seals differ from standard gear pumps – trying to fit standard gear pump to dry valve likely will result in premature pump failure

Live Pak pumps are also primarily used on refuse equipment and are engine crankshaft driven; however, the inlet on a Live Pak pump is not outfitted with a shut-off valve. With a Live Pak pump, the outlet incorporates a flow limiting valve. This is called a Live Pak valve. The valve acts as an unloading valve in OFF mode and a flow limiting valve in the ON mode. As a result, the hydraulic system speed is limited to keep within safe operating parameters.

Outlet incorporates flow limiting valve called Live Pak valve – acts as an unloading valve in OFF mode and flow limiting valve in ON mode restricting hydraulic system speed to keep within safe operating parameters

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Hydraulic systems are used in a wide range of applications to do all types of laborious work that would otherwise be difficult to do manually. Hydraulic systems can be found in heavy construction equipment, manufacturing equipment, agricultural equipment, aerospace equipment, healthcare equipment, and more!

Hydraulic systems are a part of everyone’s daily lives in one way or another. Hydraulic systems use hydraulic pumps and motors to push hydraulic oil through the system to create hydraulic energy via fluid power. Once this fluid power reaches cylinders in the system, it is converted into mechanical energy to perform the desired operations, such as raising and lowering a crane.

This list is just a small sampling of the different types of devices, components, and equipment that use hydraulic systems in some manner to provide assistance and perform the desired tasks, such as steering or lifting. Hydraulic systems are even used in hydrostatic transmissions and powerpacks.

Hydraulic pumps are essential for hydraulic systems to work correctly. The pumps are responsible for pushing and moving the hydraulic fluid through the system. This movement is what converts mechanical energy and motion into fluid power.

Hydraulic pumps work on positive displacement or by transferring a metered amount of fluid into the system. The system pressure helps regulate the necessary flow required to move the load up to the maximum permitted by whatever the system relief valve setting may be.

Additionally, the type of fluid used with the hydraulic system determines its overall effectiveness and how it can be applied to various devices, equipment, and machinery. Ideally, depending upon the application, you want to choose hydraulic fluids best suited to the application and system configuration.

Gear pumps have one gear attached to a drive shaft that is interlocked with another gear so the two rotate together. A gear pump may be external, with side-by-side gears rotating in opposite directions carrying the fluid from the low-pressure side to the high-pressure side, or internal, with one gear inside another, rotating in the same direction.

Piston pumps are, essentially, pistons that move inside cylinders. The motion of the piston displaces hydraulic fluid to move it through the hydraulic system. There are several variations of piston pumps, including:

Vane pumps use sliding vanes around a rotating shaft to move hydraulic fluid through the system. The vanes constantly adjust to maintain contact with the inside of the cam ring—an elliptical-shared ring inside the pump.

The fluid trapped between the vanes at the inlet side is forced out of the pump through the outlet side. As the fluid is forced out of the pump, it creates the fluid power and hydraulic energy to perform the desired tasks.

Hydraulic pumps perform a valuable function in helping to convert fluid power into mechanical energy to allow the hydraulic system to perform the desired functions. Since there are different types and variations of hydraulic pumps, it is essential to select the right ones that will best meet your hydraulic specifications and requirements to perform the necessary functions.

For further assistance in selecting the best high-quality hydraulic pumps, hydraulic motors, hydraulic cylinders, and other hydraulic parts and components for your hydraulic systems, please feel free to contact White House Products, Ltd. at +44 (0) 1475 742500 today!

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.

A work truck’s hydraulic system includes a hydraulic pump and, depending on the application, a hydraulic motor. Common hydraulic motor applications include winch trucks, wreckers, and cranes. While these components work together to perform the work, each serves a different purpose within the hydraulic system.

A hydraulic pump is the component within the hydraulic system that converts the mechanical energy from the prime mover (a turning force) into fluid energy in the form of oil flow. The rate of the oil flow is expressed in gallons per minute (GPM), which determines the speed at which the system will operate. There are various types of hydraulic pumps including gear, piston, vane, and more.

Along with cylinders, hydraulic motors are the actuators of the hydraulic system. An actuator is a hydraulic component that performs the physical work within the system. A motor converts the fluid energy created by the hydraulic pump into mechanical energy to perform the physical work. Like the hydraulic pump, motors can be of a gear, vane, or piston design; however, the most common is thegerotor design.

In a hydraulic system, the hydraulic pump converts mechanical energy into fluid energy in the form of oil flow. The oil flow created by the hydraulic pump is then directed to the motor through the system’s valve—such as a directional control valve, flow divider, or selector valve. Once the oil flow reaches the motor, the motor converts the fluid energy into mechanical energy to perform the physical work.

Simply put, these two components do the opposite of one another as one converts mechanical energy to fluid energy and the other, vice versa. Each of these components, while serving different purposes, rely on one another to successfully perform the work of the hydraulic system.

Gear pumps have very few moving parts. They consist of two intermeshing gears. These pumps have a constant flow rate. They operate at pressures generally between 50 and 210 bar. Gear pumps operate at the highest speeds of any pumps at up to 3000-6000 rpm.

In an external-gear pump, only one of the gear wheels, the drive gear, is connected to the drive. The other gear wheel, the driven gear, rotates in the opposite direction, so that the teeth of the rotating gear wheels interlock.

There are also double external-gear pumps, which combine two gear pumps driven by the same coupling shaft. A double external-gear pump has the advantage of supplying two independent hydraulic circuits, and also provides more flow to one circuit.

Our used core supply gives us the ability to offer rebuilt, tested products and ship them usually the same day your system goes down. We stock cores for all major hydraulic component manufacturers and also a large number of obsolete products.

Here at Hydraulex Global, we have a dedicated department that purchases new and used hydraulic units on a daily basis. We are constantly replenishing our supply with fast moving units to insure we have the product when you need it.

We also research and stock a large surplus of obsolete and rare units. You may think that your unit is so old that no one could possibly carry it. Give us a call. We may have had it sitting on our shelves just for this moment.

We pay cash for used & unused hydraulic pumps, motors, valves, and components daily. Contact us if you are looking to get rid of surplus or cores you are no longer using.

Piering is a primary means of foundation repair, using metal or concrete supports to bear the foundation’s weight and push it back in place. To get those piers in place, holes are dug around the foundation and inserted under it.

Once in place, jacks and hydraulic cylinders are temporarily installed at the top of these piers. A hydraulic pump delivers pressurized fluid to the cylinders, which convert this fluid energy into linear lifting force. The cylinders lift the piers into position and when the foundation is leveled out, the piers are capped at the top and ready to bear weight for many decades.

Our Sioux Falls location has been around since 1992 when Vander Haag"s purchased an existing salvage operation. It has over 50,000 sq. ft. of storage and service facilities with over 30 acres of salvage units and parts storage. Over the years, our Sioux Falls location has expanded significantly. In 1998, we added a Truck & Trailer Sales lot located off Cliff Avenue that is now home to over 200 used trucks, trailers and equipment. In 2020, we will be moving our reman division to a larger 8000 sq. ft. facility. Vander Haag"s website offers an easy-to-find parts search with online check-out. We ship nationwide! The website also offers a used truck locating service to help you find a truck that fits your needs and budget. Our team is ready to assist you!

Quality Aircraft Accessories stocks Aircraft Hydraulic Pumps from Cessna, Eastern Industries, Pesco and Stratopower, as well as a variety of Aircraft Hydraulic Power Packs. QAA has the ability to repair and overhaul hydraulic pumps in-house.

Browse our selection of Aircraft Hydraulic Pumps and Aircraft Power Packs at our online store. If you need assistance in finding the right Aircraft Hydraulic Pump or Aircraft Power Pack for you, call us at 1-877-833-6948 or Email Us to speak with a QAA representative.

Aircraft hydraulic pumps are used to move non-compressible fluid through an aircraft hydraulic system. This power is often used on small airplanes to operate wheel brakes, retractable landing gear, and some constant-speed propellers. On large airplanes, hydraulics are used for flight control surfaces, wing flaps, spoilers, and other systems.

Aircraft hydraulic pumps are normally engine driven, but sometimes to simplify the system manufacturers use an electric motor to drive the hydraulic system. These hydraulic power packs incorporate a reservoir, control valve and auxiliary valves into a single unit.

If you do not see the Aircraft Hydraulic Pumps & Power Packs you are looking for, please fill out the fields below in our Product Request Form and a QAA representative will contact you shortly to assist you. Even if we do not have the part in stock, we will be happy to order it for you.

Parker is a global manufacturer of hydraulic pumps, transmissions, gear pumps and motors, engineering superior products for a wide variety of applications. Delivering unsurpassed quality and performance, Parker’s extensive line of hydraulic pumps and motors helps you select the right product for your hydraulic application. Achieve easier, safer, and more efficient operation. The Pump & Motor Division assures consistent quality, technical innovation, and premier customer service.