variable hydraulic pump pricelist

The displacement of a pump is defined by the volume of fluid that the gears, vanes or pistons will pump in one rotation. If a pump has a capacity of 30 cm3, it should treat 30 ml of fluid in one rotation.

In axial piston variable pumps, the flow is proportional to the drive speed and the displacement. The flow can be steplessly changed by adjusting the swivel angle. Axial piston variable ...

... axial piston pump type V60N is designed for open circuits in mobile hydraulics and operate according to the swash plate principle. They are available with the option of a thru-shaft for operating additional ...

Variable displacement axial piston pumps operate according to the bent axis principle. They adjust the geometric output volume from maximum to zero. As a result they vary the flow rate ...

... piston pump type V30D is designed for open circuits in industrial hydraulics and operate according to the swash plate principle. They are available with the option of a thru-shaft for operating additional ...

... circuit axial piston pumps are used as hydrostatic transmission components in self-propelled machines and for rotary drives in both fixed and mobile equipment of all kinds.

Axial piston twin flow pump. With a very high performance in all job conditions. Due to its twin flow configuration this pump allows a great variety of solutions in different job applications.

Air hydraulic pump, double pneumatic motor, double effect, foot operated with lock-up function, lever distributor valve (4/3), 10L tank, oil flow 8.5 / 0.26 l / min

... customer system options for mechanical, hydraulic and electric input solutions are available. Further special regulating features like torque control and pressure cut-off are also available. The reliable ...

... needs of truck hydraulics, the TXV variable displacement pumps with LS (Load Sensing) control allow flow regulation to suit the application requirements. The pump ...

... rev. displacements, these pumps are designed to operate in both directions of rotation (clockwise or counter-clockwise). Only one reference regardless of direction of rotation. The TXV indexable pumps ...

... PVG is a variable-displacement axial-piston pump designed to take on your most demanding applications. It offers high-pressure, superior performance in a compact design ...

Variable displacement pumps in closed loop; 3 basic design units and 8 max. displacement sizes of 14, 18, 21, 28, 35, 46, 56, 64 cc/rev; various control options; max. ...

Parker P2/P3 High Pressure Axial Piston Pumps are variable displacement, swashplate piston pumps designed for operation in open circuit, mobile hydraulic ...

... Series pump offers variable displacement axial piston pumps for open-circuit applications. Featuring a compact footprint and continuous operating pressure ...

Designed for power and speed, the Oilgear PVV open-loop axial-piston hydraulic pumps can handle large, heavy-duty systems. Manufactured with advanced engineering and computer-optimized, the PVV pump range delivers up to 450 Bar / 560 horespower which equates to four times the horsepower at less than half the cost of other manufacturers pumps.

With it"s compact design available in several displacements, the PVV pumps offer a large selection of readily interchangeable controls. With improved response controls and reduced noise levels, its rugged cylinder design enhances performance.

The patented, pressure lubricated swashblock design offers high performance for high-cycling operations. It also contributes to the pump’s ability to run on low-viscosity fluids, including high water content, fire-resistant and other special fluids.

Zeus Hydratech fully supports the Oilgear PVV pump product line and is the only valid source for OEM parts. All Oilgear repairs are machined and tested per our original factory specifications.

6808 rexroth hydraulic pumps prices products are offered for sale by suppliers on Alibaba.comAbout 20% % of these are hydraulic pumps, 5%% are construction machinery parts, and 1%% are pumps.

A wide variety of rexroth hydraulic pumps prices options are available to you, such as new, used.You can also choose from piston pump, gear pump and vane pump rexroth hydraulic pumps prices,as well as from 1 year, 6 months, and 1.5 years rexroth hydraulic pumps prices,and whether rexroth hydraulic pumps prices is hydraulic power units, or fittings.

The hydraulic power pumps are ideal for small, high-pressure applications. They have a positive lifplacementpan and a variety of hydraulic power pumps, ideal for those who want to save energy on rotating pumps.

The hydraulic power varies depending on the pressure of the pump, for it is lowering the hydraulic piston. It prevents hydraulic pistonches from expanding or lifting the piston from a pressure point to the piston.

These hydraulic pumps are great for intensive, short-term space. They are also great for intensive, and lifeline piston pumps have a wide range of pressure settings to either the front or center- gravity pumping, the lifeline piston pumps have two pistons,

Larger hydraulic pumps are designed to pump two-stage hydraulic pumps. These larger hydraulic piston pumps, for example, have a piston incorporated of the two-stroke hydraulic pumps.

With fast control response and superior performance, the PVG is a variable-displacement axial-piston pump designed to take on your most demanding applications. It offers high-pressure, superior performance in a compact design — while thriving on low-viscosity fluids.

With fast control response and superior performance, the PVG is a variable-displacement axial-piston pump designed to take on your most demanding applications. It offers high-pressure, superior performance in a compact design — while thriving on low-viscosity fluids.

With fast control response and superior performance, the PVG is a variable-displacement axial-piston pump designed to take on your most demanding applications. It offers high-pressure, superior performance in a compact design — while thriving on low-viscosity fluids.

With fast control response and superior performance, the PVG is a variable-displacement axial-piston pump designed to take on your most demanding applications. It offers high-pressure, superior performance in a compact design — while thriving on low-viscosity fluids.

With fast control response and superior performance, the PVG is a variable-displacement axial-piston pump designed to take on your most demanding applications. It offers high-pressure, superior performance in a compact design — while thriving on low-viscosity fluids.

With fast control response and superior performance, the PVG is a variable-displacement axial-piston pump designed to take on your most demanding applications. It offers high-pressure, superior performance in a compact design — while thriving on low-viscosity fluids.

With fast control response and superior performance, the PVG is a variable-displacement axial-piston pump designed to take on your most demanding applications. It offers high-pressure, superior performance in a compact design — while thriving on low-viscosity fluids.

When you need peak performance from a variable-displacement axial-piston pump, the Oilgear pump PVV line is ready. No matter what pressure and flow demands you face, these pumps rise to the challenge.

When you need peak performance from a variable-displacement axial-piston pump, the Oilgear pump PVV line is ready. No matter what pressure and flow demands you face, these pumps rise to the challenge.

When you need peak performance from a variable-displacement axial-piston pump, the Oilgear pump PVV line is ready. No matter what pressure and flow demands you face, these pumps rise to the challenge.

When you need peak performance from a variable-displacement axial-piston pump, the Oilgear pump PVV line is ready. No matter what pressure and flow demands you face, these pumps rise to the challenge.

Quiet operation, high efficiency and compact design — all available at a competitive price. That’s what Oilgear PVWC closed-loop, hydrostatic axial-piston hydraulic pumps bring to the table. All designed around our proven rotating group.

Quiet operation, high efficiency and compact design — all available at a competitive price. That’s what Oilgear PVWC closed-loop, hydrostatic axial-piston hydraulic pumps bring to the table. All designed around our proven rotating group.

Quiet operation, high efficiency and compact design — all available at a competitive price. That’s what Oilgear PVWC closed-loop, hydrostatic axial-piston hydraulic pumps bring to the table. All designed around our proven rotating group.

Designed to be cost-effective, stable and low-maintenance, PVWJ is a variable-displacement axial-piston pump with a medium control response. Like all Oilgear pumps, it thrives on low-viscosity fluids — and comes in a variety of frame sizes and available displacement rates.

Designed to be cost-effective, stable and low-maintenance, PVWJ is a variable-displacement axial-piston pump with a medium control response. Like all Oilgear pumps, it thrives on low-viscosity fluids — and comes in a variety of frame sizes and available displacement rates.

Designed to be cost-effective, stable and low-maintenance, PVWJ is a variable-displacement axial-piston pump with a medium control response. Like all Oilgear pumps, it thrives on low-viscosity fluids — and comes in a variety of frame sizes and available displacement rates.

Designed to be cost-effective, stable and low-maintenance, PVWJ is a variable-displacement axial-piston pump with a medium control response. Like all Oilgear pumps, it thrives on low-viscosity fluids — and comes in a variety of frame sizes and available displacement rates.

Designed to be cost-effective, stable and low-maintenance, PVWJ is a variable-displacement axial-piston pump with a medium control response. Like all Oilgear pumps, it thrives on low-viscosity fluids — and comes in a variety of frame sizes and available displacement rates.

Designed to be cost-effective, stable and low-maintenance, PVWJ is a variable-displacement axial-piston pump with a medium control response. Like all Oilgear pumps, it thrives on low-viscosity fluids — and comes in a variety of frame sizes and available displacement rates.

Designed to be cost-effective, stable and low-maintenance, PVWJ is a variable-displacement axial-piston pump with a medium control response. Like all Oilgear pumps, it thrives on low-viscosity fluids—and comes in a variety of frame sizes and available displacement rates.

Designed to be cost-effective, stable and low-maintenance, PVWJ is a variable-displacement axial-piston pump with a medium control response. Like all Oilgear pumps, it thrives on low-viscosity fluids — and comes in a variety of frame sizes and available displacement rates.

Designed to be cost-effective, stable and low-maintenance, PVWJ is a variable-displacement axial-piston pump with a medium control response. Like all Oilgear pumps, it thrives on low-viscosity fluids — and comes in a variety of frame sizes and available displacement rates.

Designed to be cost-effective, stable and low-maintenance, PVWJ is a variable-displacement axial-piston pump with a medium control response. Like all Oilgear pumps, it thrives on low-viscosity fluids — and comes in a variety of frame sizes and available displacement rates.

Extremely effective across numerous industrial applications that require quick response in extreme environments, the XD5 series of pumps offer lightning-fast control response on both low-viscosity fluids and standard hydraulic oil. Engineered to handle the most challenging environments, they have been designed to be a high-performance solution for demanding mobile applications.

Variable Displacement Axial Piston Pump, Pressure Rating of 6,090 psi. The C Series Variable Displacement Axial Piston Pumps are engineered for heavy-duty mobile equipment applications. Pumps offer a pressure rating of 6,090 psi, durable construction and a compact footprint. C Series variable displacement piston pumps have been designed for use in closed circuit hydrostatic applications. […]

Variable Displacement Closed Circuit Axial Piston Pumps, Displacement 17 to 28 cm³ (1,04 to 1,71 in³), Continuous 280 bar (4060 psi), Pressure Intermittent 300 bar (4350 psi), (Power-Transmission Hydrostatic Transmission). The axial piston pumps series HM P1A are designed to operate in a closed circuit. The available control systems make it easy to use these […]

Variable Displacement Closed Circuit Axial Piston Pumps, Displacement 28 to 36 cm³ (1,71 to 2,20 in³), Continuous 280 (4060 psi), Pressure Intermittent 300 bar (4350 psi), (Power-Transmission Hydrostatic Transmission). The axial piston pumps series HM P1M is designed to operate in a closed circuit. The available control systems make it easy to use these pumps in […]

Variable Displacement Closed Circuit Axial Piston Pumps, Displacement 7 to 18 cm³ (0,43 to 1,10 in³), Continuous 210 bar (3045 psi), Pressure Intermittent 230 bar (3335 psi), (Power-Transmission Hydrostatic Transmission). The axial piston pumps series HM PLB is designed to operate in a closed circuit. Displacement range 7cc thru 18cc, R or L hand rotation, single […]

Variable Displacement Closed Circuit Axial Piston Pumps, Displacement 7 to 18 cm³ (0,43 to 1,10 in³), Continuous 250 | 230 bar (3625 | 3335 psi), Pressure Intermittent 280 | 250 bar (4060 | 3625 psi), (Power-Transmission Hydrostatic Transmission). The axial piston pumps series HM PO is designed to operate in a closed circuit. The available control systems […]

Variable Displacement Closed Circuit Axial Piston Pumps, Displacement 17 to 34 cm³ (1,04 to 2,07 in³), Continuous 280 bar (4060 psi), Pressure Intermittent 300 bar (4350 psi), (Power-Transmission Hydrostatic Transmission). The axial piston pumps series HM PS is designed to operate in a closed circuit. The available control systems make it easy to use these pumps […]

Variable Displacement Closed Circuit Axial Piston Pumps, Displacement 9+9 to 16+16 cm³ (0,55+0,55 to 0,97+0,97 in³), Continuous 280 bar (4060 psi), Pressure Intermittent 300 bar (4350psi), (Power-Transmission Hydrostatic Transmission). The axial piston pumps series HM PX is designed to operate in a closed circuit. The available control systems make it easy to use these pumps in any application for industrial and […]

Variable Displacement Closed Circuit Axial Piston Pumps, Displacement 7 to 18 cm³ (0,43 to 1,10 in³), Continuous 250 | 230 bar (3625 | 3335 psi), Pressure Intermittent 280 | 250 bar (4060 | 3625 psi), (Power-Transmission Hydrostatic Transmission). The axial piston pumps series HM PZA have been designed to operate in a closed circuit. The available control systems […]

Variable Displacement Closed Circuit Axial Piston Pumps, Displacement 14 to 23 cm³ (0,85 to 1,40 in³), (Swashplate 14,5 | 19 | & 18), Continuous 250 bar (3625 psi), Pressure Intermittent 280 bar (4060 psi), (Power-Transmission Hydrostatic Transmission). The axial piston pumps series HP P2 is designed to operate in a closed circuit. Control Systems are available […]

Closed Circuit Axial Piston Pumps, Variable Displacement , Max. Displacement from 17cc to 34 cc, SAE B Flange, (Swashplate 18 | 19 | 18 | 18 | 18°), Pressure Intermittent 300 (bar), 4350 (psi). The axial piston pumps series HP P4 34•46•50•58•65 is designed to operate in a closed circuit, for applications at medium pressure. Control […]

Variable Displacement Closed Circuit Axial Piston Pumps, Displacement 55 to 78 cm³ (3,35 to 4,76 in³), (Swashplate 16,3 | 17,3 | 17,7 °), Continuous 420 | 400 bar (6090| 5800 psi), Pressure Intermittent 450 | 420 bar (6525 | 6090 psi), (Power-Transmission Hydrostatic Transmission) The axial piston pumps series HP P6 series is designed to operate […]

Variable Displacement Closed Circuit Axial Piston Pumps, Displacement 82 to 125 cm³ (5,0 to 7,6 in³), (Swashplate 18,0, 16,5, 20,0°), Continuous 400 bar (5800 psi), Pressure Intermittent 420 bar (6090 psi), (Power-Transmission Hydrostatic Transmission). The axial piston pumps series HP 8 82•100•125 is designed to perform in closed circuit for high pressure operations. The various control […]

The self-regulating HPR-02 is a high perssure axial piston pump in a swash plate designed for open loop systems. With both clockwise and counter clockwise rotation, it is self priming at high nominal speeds.  It can reach a higher rotating speed by tank pressurization or swash angle reduction. It is a good fit for application […]

Variable Displacement Pump for Closed Loop Operation, Displacement 54.7 to 281.9 CC/Rev, Max. Operating Speed 2400 RPM to 3900 RPM, Max. Pressure 500 Bar, Nominal Pressure 450 Bar, Power Take-Off (PTO) Flange, Internal Gear Pump (IGP) and External Gera Pump (EGP) Available. The HPV-02 variable pump is an axial piston pump designed for high pressure […]

Open Loop Variable Displacement Axial Piston Pump The K3V/K5V Series are variable displacement axial piston pumps of swash plate design, suitable for use in mobile applications. Various rotary group layouts, tandem type with PTO and parallel type are available to respond to applications. The K3V/K5V Series has a high power density, high suction capability, wide […]

Swash Plate Variable Displacement Axial Piston Pump. The K3VG Series are variable displacement axial piston pumps of swash plate design for industrial equipment. The K3VG Series are available in size ranging from 63 to 560 cm³/rev with various control options including a highly precise electro-hydraulic servo regulator “ILIS”. Main features of the K3VG Series includes […]

Variable Displacement Swash Plate Design, Open Loop. The K3VL Series – medium pressure, open circuit, axial piston pumps are designed for mobile, industrial, and marine applications. The pump’s rotating groups are based on the proven design of the K3V and K3VG pumps. K3VL pumps are available in nominal displacements ranging from 1.71 to 12.20 in³/rev […]

Variable Displacement Swash Plate Design, Open Loop, Displacement 50 (cm³) to 150 (cm³). The K3VLS series are variable displacement axial piston pumps of swash plate design, suitable for use in mobile applications and industrial vehicles with medium pressure hydraulic systems. The K3VLS pumps enable flexible configuration in a wide range of applications with their compact […]

Low Noise Variable Displacement Axial Piston Pump. The K7V Series are variable displacement axial piston pumps of swashplate design, suitable for use in mobile applications. A long life is obtained by adopting large capacity of bearing and thicker shaft which reduces the load on the edge of bearing rollers. The power density if 1.5 times […]

Swash-plate Axial Piston Pump The K7VG high-pressure swashplate pump developed for general industrial machinery use and is based on long and rich experience. The adoption of the high-load bearing and friction-free contacting mechanism of shoes has achieved high reliability and long life. The unique compact rigid housing construction in addition to the semi-cylindrical swash-plate and […]

Variable Displacement Swash Plate Design, Closed Loop. The K8V series with a range in pump size from 71 to 130 cm3/rev are equipped with electric or hydraulic pilot displacement control. The K8V series pumps, having the integrated components required for a closed system, such as a charge pump, high and low-pressure relief valves, and a […]

Bent Axis Variable Displacement Axial Piston Pump. The LVP 017 Series are manual variable displacement axial piston pumps of bent axis design for high-pressure jacks. The bent axis type axial piston pumps have features such as high efficiency and long life. They can operate for long periods under severe conditions: high-pressure continuous drive, use of […]

Variable Displacement Axial Piston Pump The LXV/LZV series are variable displacement axial piston pump of bent axis design and have heavy duty bearings to achieve long life. They can operate for long periods of time under severe conditions: high-pressure continuous drive, use of fire-resistant fluid, etc.

Variable Displacement Closed Circuit Axial Piston Pumps, Displacement 21 to 37 cm³ (1,28 to 2,26 in³), (Swashplate 18°), Continuous 250 bar (3625 psi), Pressure Intermittent 300 bar (4350 psi), (Power-Transmission Hydrostatic Transmission). The axial piston pumps series M4 PV is designed to operate in a closed circuit. Control systems actually available are making easy to […]

Variable Displacement Axial Piston Pump, Operating Pressure of 4,060. Variable, swashplate piston pumps designed for operation in open circuit, mobile hydraulic systems. The perfect choice when it comes to cost-saving installation as well as high productivity and power density. Displacement from 60 to 145 cc/rev. The P2/P3 Series has been designed to meet the specific […]

Medium Pressure Super Charged Pumps, Pressure Rating 3,000 psi. The PAVC Medium Pressure/Super Charged Pumps provide reliable high-speed operation. With a pressure rating of 3,000 psi, they are ideal for a variety of medium pressure mobile and industrial applications. Featuring a flexible, compact design, Pavc Medium Pressure Pumps deliver a reliable,easy-to-use solution for a wide […]

Variable Displacement Piston Pump, Operating Pressure of 4,060 psi. The PD Series pump offers variable displacement axial piston pumps for open-circuit applications. Featuring a compact footprint and continuous operating pressure of up to 4,060 psi, PD pumps provide quiet operation and efficient control. The PD Series of Open-Circuit Piston Pumps boost productivity in medium pressure […]

Variable Flow, High-Pressure and High-Speed, For Open Circuits SAE, ISO, DIN), Continuous Pressure Rating up to 6,000 PSI, Intermittent Pressure Rating up to 7,250 PSI, Five Frame Sizes (80 cc – 260 cc), Maximum Speed of 2,550 RPM. The Premier Series features superior design and simplified maintenance; the Premier Series delivers high-pressure variable piston pumps […]

Variable-Displacement Axial Piston Pump with Fast Control Response. The PVG is a variable-displacement, axial piston pump with fast control response. The PVG thrives on low viscosity fluids and is available in a variety of control and porting options. It is designed to be a high-performance solution for demanding applications. PVG open loop, axial piston hydraulic […]

Variable Axial Piston Pump with Longitudinal Controls The PVK pump line consists of three sizes of variable-displacement, open-loop, axial-piston pumps. The PVK is unique from other variable pumps because it has longitudinally-mounted controls. It is recommended that legacy PVK pumps be replaced by the current PVG pump line. Available in two frame sizes and three […]

A Versatile Pump with a Modular Design. The PVM line of variable-displacement, axial-piston pumps is designed to adapt to your most demanding applications. Virtually indestructible, the modular PVM open-loop, axial-piston hydraulic pumps offer advanced engineering at an affordable price. Computer-optimized and with multiple controls available, PVM pumps deliver high performance in a compact design. Available […]

Variable Volume Displacement Piston Pump, Operating Pressure of 3,600 psi. The PVP Series provides durable variable volume piston pumps for medium pressure applications. With aa pressure rating of 3,600 psi and a wide range of controls, PVP pumps are efficient and reliable. The PVP Series is flexible and high-performing, resulting in increased uptime with fast […]

Axial Piston Variable Pumps, Operating Pressure Up to 420 bar. The PVplus (PV+) is an open circuit, variable swashplate piston pump. Optimized for heavy-duty industrial and marine applications. Operating pressures of up to 420 bar, high-speed ratings, a wide range of highly responsive controls, and a displacement from 16 to 360 cc/rev. The PVplus (PV+)  provides […]

The Flagship, High-horsepower Variable Displacement Pump. The PVV line pumps represents the pinnacle of performance in a variable-displacement, axial-piston pump. Designed for power and speed, PVV open-loop, axial-piston hydraulic pumps by delivering the punch that is required for large, heavy-duty systems. Utilizing advanced engineering, the PVV pump line delivers up to 560 horsepower – four […]

The Closed-loop Pump for Low-viscosity Fluids. Rugged and tough,  PVWC closed-loop, hydrostatic, axial-piston hydraulic pumps offer low horsepower for high-performance applications. The PVWC pump combines quiet operation, high efficiency and competitive pricing in a compact design. Capable of operating with low-viscosity or other special fluids, and with excellent contamination resistance properties, PVWC pumps feature a […]

Variable Displacement Cost-effective, Rugged Pump. The PVWJ is a variable-displacement, axial-pistol pump with medium control response. It thrives on low viscosity fluids and is available in a variety of control and porting options. The PVWWJ open loop, axial piston hydraulic pumps  are uniquely designed for enhanced stability and less maintenance in low to medium horsepower […]

Variable Displacement Pump for Ultra Low-lubricity Applications. The PVWW line of pumps provides excellent variable-displacement pumping with fluids with a high water concentration. The PVWW is available with a variety of control modules. PVWW open-loop, variable-displacement, axial-piston hydraulic pumps are uniquely designed for low-lubricity, low-viscosity applications, such as pumping water-based, and environmentally-friendly fluids. Available in […]

Axial Piston Variable Pumps, with Operating Pressure up to 6,100 psi. The VP1 hydraulic variable truck pump series has operating pressures up to 420 bar (6,100 psi) and speeds up to 3000 rpm. The VP1 pump is a robust design that provides circuit reliability for the most demanding truck applications. Sizes from 45 – 130cc. […]

For detailed technical information on P2/P3 pumps please download our latest catalogue and installation manuals under Product Support and/or contact your local Parker dealer for support.

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.

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