Gear vs Vane vs Piston Hydraulic Pumps: Differences and Which You Need

A gear pump is the simple, low-cost, fixed-flow workhorse; a vane pump is the quieter fixed-flow choice for medium-pressure industrial work; a piston pump is the one you pick when you need high pressure, the best efficiency or a flow that changes on demand. If you are replacing a pump, the answer is almost always the same type that came off the machine, because the circuit, the controls and the mount were designed around it.

In factory catalog numbers: Parker rates its PGP030/031 gear pumps at 2,250 to 3,000 psi depending on gear width, Vickers V series vane pumps at 2,000 to 3,000 psi continuous, and the Denison T6C at 240 bar continuous, while an open loop Rexroth A10VSO piston pump is rated 280 bar nominal and a closed loop Danfoss Series 90 runs to 450 bar maximum working pressure. The full comparison, with the document behind every figure, is below.

Which one do I need? Usually the one you are holding. Read the model code off the tag and replace like for like, or let us rebuild it. Changing pump type is a system redesign, not a parts swap. If the tag is gone, start with our guide to identifying a pump or motor with no tag.

How do gear, vane and piston pumps work?

All three are positive displacement pumps: every turn of the shaft moves a set volume of oil, and pressure only shows up when something downstream resists that flow. Our what is a hydraulic pump article covers the basics. The difference is how each type traps and pushes the oil.

Gear pump. Two meshing gears turn inside a close-fitting housing. Oil is carried around the outside of the gears in the pockets between the teeth and the housing, not through the middle, and is squeezed out where the teeth mesh. Commercial Intertech's gear pump troubleshooting booklet explains that outlet pressure pushes the gears toward the inlet side so the tooth tips seal against the housing, and pressure-balanced thrust plates squeeze against the gear faces to seal the sides. External gear pumps like the Parker/Commercial line are fixed displacement only.
Vane pump. A slotted rotor carries sliding vanes inside an oval cam ring. The vanes follow the ring, so the chambers between them grow at the inlet and shrink at the outlet. On Vickers V and VQ pumps the ring, rotor, vanes and side plates come as one replaceable cartridge, which is why our Vickers cartridge kit guide treats the cartridge as the heart of the rebuild.
Piston pump. Pistons ride in bores in a cylinder block turned by the shaft. Their shoes slide on an angled swashplate, so each piston draws oil in on one half of the turn and pushes it out on the other half through a valve plate. Vickers' PVH catalog describes the variable version: the swashplate sits in a yoke that pivots, and changing its angle changes the piston stroke and the flow. More detail is in what is a hydraulic piston pump and how does it work.

Gear vs vane vs piston pump comparison table

Every figure below is a factory catalog number for a named pump. Ratings vary a lot inside each family, so treat the named model as an example, not a limit for the whole type.

	Gear pump	Vane pump	Piston pump
Pressure (factory examples)	Parker PGP030: 2,500 psi (172 bar), 2,250 psi on the 1-3/4" and 2" gears. PGP031: 3,000 psi (207 bar), 2,500 psi on the widest gears. Eaton advertises gear pumps to 4,000 psi continuous.	Vickers 20V (5, 8 and 11 gpm rings): 3,000 psi (207 bar) continuous; 25V, 35V and 45V: 2,500 psi (172 bar). Denison T6C: 240 bar continuous, 275 bar intermittent on anti-wear oil (most sizes).	Vickers PVE012/19: 3,000 psi (210 bar). Parker PVP16: 3,600 psi (248 bar) continuous, 4,500 psi peak. Rexroth A10VSO: 280 bar nominal, 350 bar max. Danfoss Series 90 (closed loop): 450 bar max working.
Efficiency	Parker publishes average output, not a percentage. Worked out from its table at 1,800 rpm and 2,500 psi, a PGP030/031 delivers about 91% (1" gear) to 94% (2" gear) of theoretical flow.	Vickers V series: volumetric efficiency above 90%. Denison T6/T7: volumetric and mechanical efficiency each typically better than 94%.	Parker PVP16 at 1,800 rpm: volumetric efficiency stays above 95% across its pressure range, overall efficiency peaks a little under 90% (typical curve). Eaton's heavy-duty sizing guide assumes 96% pump volumetric efficiency.
Noise (sound pressure at 1 m)	Eaton GGP 16 cc gear pump at 3,000 psi: about 54 dB(A) at 600 rpm, rising to about 69 dB(A) at 2,800 rpm.	Vickers V series: as low as 62 dB(A). Denison T6C-022: about 58-65 dB(A) at 1,000 rpm and 61-69 dB(A) at 1,500 rpm, up to 240 bar.	Vickers PVE012: 65-77 dB(A). PVE19: 74-87 dB(A). Full stroke and compensated, from 1,200 rpm at 1,000 psi up to 1,800 rpm at 3,000 psi.
Contamination tolerance (Vickers target ISO code at 2,000-3,000 psi)	Fixed gear: 19/17/15. Above 3,000 psi: 18/16/13.	Fixed vane: 19/17/14. Variable vane: 18/16/14. Denison credits its double-lip vane with high resistance to particle contamination.	Fixed piston: 18/16/14. Variable piston: 17/15/13, and 16/14/12 above 3,000 psi. Pistons need the cleanest oil.
Cost to buy and rebuild	Lowest. Often cheaper to replace than to rebuild once the housing is cut.	Middle. A cartridge kit renews the pumping parts without replacing the body.	Highest. Rotating groups, valve plates and controls are precision parts, and the teardown decides whether a rebuild beats a new unit.
Fixed or variable	Fixed only.	Fixed in the Vickers V/VQ and Denison T6/T7 lines we support. Variable vane pumps exist (Vickers lists them separately).	Fixed or variable. Variable piston pumps carry compensator, load sense or displacement controls.
Open or closed loop	Open loop work circuits, and as charge pumps on hydrostatic drives.	Open loop.	Both. Open loop (A10VSO, PVP, PVE, PVH) or closed loop hydrostatic (Series 90, Eaton heavy-duty).
Brands we support	Parker / Commercial gear pumps and dump pumps	Vickers vane pumps, Denison vane pumps	Vickers, Parker, Denison, Rexroth, Sundstrand / Danfoss, Oilgear, Kawasaki, Eaton heavy-duty

Two things jump out of that table. First, the cleanliness ladder is real: the same Vickers chart asks for cleaner oil as you go from gear to vane to piston, and from fixed to variable. Second, noise depends as much on the individual design, speed and pressure as on the pump type. A modern gear pump at low speed can be quieter than a piston pump at full load. Our fluid cleanliness and ISO code guide has the full Vickers, Danfoss, Rexroth and Eaton charts, and the viscosity guide by pump type covers oil grade.

Factory cleanliness targets differ by maker. The codes above are from one Vickers chart so the three types compare on the same basis. Danfoss lists 22/18/13 for its Series 90 and Rexroth asks for at least 20/18/15 on the A10VSO. Use the figure from the manual for your own pump.

Gear pump vs vane pump: which is better?

Neither is better across the board. A gear pump is simpler, cheaper and shrugs off rough mobile duty, which is why Parker lists construction, dump and refuse trucks, forestry and agriculture as the home turf of its PGP line. A vane pump runs quieter and smoother at the same flow, holds its efficiency well, and is easy to renew because the whole pumping element is a cartridge. Vickers built its V series for industrial work for exactly those reasons, so you find vane pumps on power units and plant equipment, and on plenty of older mobile machines that left the factory with V or VQ pumps.

The trade-off is pressure and dirt. Gear and vane pumps sit in roughly the same 2,250 to 3,500 psi continuous band in the catalogs above, and the Vickers chart asks for slightly cleaner oil on a vane pump than on a gear pump at the same pressure.

Gear pump vs piston pump: when is the piston pump worth it?

Pay for a piston pump when you need one or more of these: pressure above what gear and vane pumps are rated for, flow that changes with demand (a compensator or load sense control), a reversible closed loop drive, or the efficiency to keep heat down on a machine that runs long hours. A fixed gear pump pushes full flow all the time, and whatever the circuit does not use goes over the relief valve as heat. A variable piston pump backs off to the flow the circuit needs.

The cost is money and cleanliness. Piston pumps want the cleanest oil of the three, they have more precision parts to wear, and a failure tends to send debris downstream. If your machine has a gear pump and works fine, a piston pump is not an upgrade you bolt on. It needs a different control circuit, and usually a case drain line the gear pump never had.

What is the difference between a fixed and a variable displacement pump?

A fixed displacement pump moves the same volume every revolution, so its flow is set by shaft speed. The Permco pump-sizing sheet gives the working formula: gpm = displacement (cubic inches per revolution) x rpm x volumetric efficiency / 231. Gear pumps and most vane pumps are fixed.

A variable displacement pump can change its stroke while running. On a swashplate piston pump that means tilting the swashplate: full angle gives full flow, zero angle gives no flow. What tilts it is the control. A pressure compensator destrokes the pump when pressure reaches its setting, a load sense control holds a set margin above the working pressure, and a displacement control sets the angle from a lever, a hydraulic signal or an electric signal. See load sensing pumps explained, how to adjust hydraulic pump pressure and the Vickers compensator adjustment page.

What is the difference between an open loop and a closed loop pump?

In an open loop circuit the pump draws oil from the reservoir, sends it through valves to cylinders or motors, and the return oil goes back to the tank. Rexroth calls the A10VSO a pump for hydrostatic drives in open circuit, and the same goes for the Parker PVP, the Vickers PVE and PVH, and every gear and vane pump on this page. Flow only goes one way through the pump.

In a closed loop (hydrostatic) circuit the pump outlet feeds a motor and the motor return goes straight back to the pump inlet. Danfoss builds the Series 90 for closed circuit use: reversing the swashplate angle reverses the flow and so reverses the motor. Because the loop leaks a little and the oil heats up, a closed loop pump carries a charge pump, check valves and relief valves that an open loop pump does not have. Our page on how hydrostatic drives work walks through the whole loop.

A closed loop pump is not interchangeable with an open loop pump, even when the displacement matches. One goes over center and needs charge pressure; the other draws from a tank and only pumps one way.

Which hydraulic pump do I need?

Replacing a pump: match the model code exactly, including rotation, shaft, mounting flange, ports and control. Our brand pages decode the codes: Vickers, Denison, Parker, Rexroth, Sundstrand / Sauer-Danfoss, Oilgear and Kawasaki.
Simple fixed-speed circuit, moderate pressure, cost matters: gear pump.
Industrial power unit, noise matters, moderate pressure: vane pump.
High pressure, variable demand or long duty hours: variable piston pump with the right control.
Propel drive, winch, mixer drum or anything that has to reverse smoothly under load: closed loop piston pump and motor.
Check the oil before you pick: if the system cannot hold the cleanliness a piston pump wants, fix the filtration first or the new pump will not last.

Matching a motor to the pump is its own question; see how hydraulic motors work. For general questions, our hydraulic pump questions page answers the common ones.

What does a rebuild replace on each pump type?

A rebuild renews the parts that wear and keeps the castings. What wears depends on the pump type. The factory repair procedures below split parts into always-replace and inspect-and-judge.

Pump type	Always replaced	Inspected, replaced if worn	Factory note
Gear (Parker / Commercial)	Shaft seal and the internal seals behind the thrust plates (pocket seals on roller bearing pumps, channel seals on bushing pumps, ring seals)	Gear set, thrust plates, bearings or bushings, the housing bore where the gear tips cut in, drive shaft	Commercial warns that a shaft seal leak often means the gear set and ring seals need replacing too, and that every rebuilt pump should be tested. Over-pressure cuts the housing deeper and adds internal slip.
Vane (Vickers V, VQ)	Seal kit	Bearings, shaft, key, pressure plate, wear plate, flex plates, rotor, vanes, ring	Vickers' repair procedure: if the ring, rotor or vanes are damaged, replace the whole cartridge kit. Body, cover, bracket and housing are reused.
Piston, open loop (Vickers PVB, PVE, PVH, PVQ)	Gasket kits and oil seals	Shaft, bearings, swashplate, piston and shoe assemblies, shoe plate, spherical washer, cylinder block, valve plate, valve block, compensator spool, springs	Vickers recommends replacing the rotating group as a whole group, and gives lapping and re-tuftride limits for the block, valve plate and swashplate.
Piston, closed loop (Sundstrand, Eaton heavy-duty)	All seals (Eaton: always use new seals on reassembly), including the shaft seal	Everything on the open loop list, plus the charge pump, charge relief, and the relief or multi-function valve cartridges	Look at the motor too. On a closed loop drive the debris from a failed pump goes straight to the motor.

Across every brand, nearly every rebuild needs a seal kit, a shaft seal, a shaft or shaft bearings. Bigger jobs add rotating groups, pistons, barrels and swashplates on piston pumps, or a cartridge on vane pumps. Brand-specific walkthroughs: Vickers vane cartridge rebuild, Rexroth A10VO/A10VSO rebuild service, the Vickers PVE parts catalog and rebuild guide and the Denison T series catalog. Before you decide, a case drain flow test tells you how worn a piston pump really is, and the pump repair cost page explains what drives the price.

Frequently asked questions

Which is more efficient, a gear, vane or piston pump?

Piston pumps, as a rule. Parker's PVP16 curve shows volumetric efficiency above 95% at 1,800 rpm, and Denison rates its T6 and T7 vane pumps at typically better than 94% volumetric. Parker's own average-output table puts a PGP030/031 gear pump at about 91% to 94% of theoretical flow at 2,500 psi. The bigger difference is that a variable piston pump only makes the flow the circuit needs, so it wastes less as heat.

Are vane pumps quieter than gear pumps?

Usually, but not always. Vickers rates its V series vane pumps as low as 62 dB(A) and Denison's T6C-022 runs about 58-69 dB(A) depending on speed and pressure. Eaton's GGP gear pump measures about 54 dB(A) at 600 rpm and about 69 dB(A) at 2,800 rpm at 3,000 psi. Speed, pressure and the individual design matter as much as the pump type.

Which pump type handles dirty oil best?

Gear pumps tolerate the most, piston pumps the least. Vickers' cleanliness chart asks for ISO 19/17/15 on a fixed gear pump at 2,000-3,000 psi, 19/17/14 on a fixed vane pump and 17/15/13 on a variable piston pump. Tolerating dirt is not the same as liking it: contamination is the top cause of failure for all three.

Can I replace a gear pump with a piston pump?

Not as a straight swap. A piston pump needs a different control, usually a case drain line to tank, and cleaner oil than a gear pump circuit was built for. Replace like for like unless the whole circuit is being redesigned.

What is the difference between a hydrostatic pump and a pressure compensated pump?

A hydrostatic pump is a closed loop pump: its swashplate goes over center to reverse flow to a motor, and it carries a charge pump and loop relief valves. A pressure compensated pump is an open loop pump that draws from a tank, pumps one way, and destrokes when outlet pressure reaches its setting. Both are usually swashplate piston pumps, but they are not interchangeable.

Is a piston pump always variable displacement?

No. Piston pumps come in fixed and variable versions. Variable models carry a swashplate that can change angle under a compensator, load sense or displacement control; fixed models run at one angle.

Which pump type is cheapest to rebuild?

Gear pumps have the fewest parts, but once the housing bore is cut a new pump is often the better buy. Vane pumps are quick to renew with a cartridge kit. Piston pumps cost the most to rebuild, and the teardown decides whether a rebuild beats a new unit. Send us the model code and we reply with price, availability and lead time.

About the technical information on this page. Figures, procedures and part numbers here come from manufacturer service literature and are provided for reference only. They are only as accurate as the factory data, and the revision we have on file may not be the latest for your unit. Always confirm against the current manufacturer documentation for your exact model and follow safe work practices. RestoPower is not responsible for damage, injury or loss resulting from the use or misuse of this information, or from incorrect assembly, adjustment, installation or operation of any unit.

Not sure which pump you have?

Send us the tag or model code, a photo, and what the machine is doing. We will identify it, tell you whether it is worth rebuilding, and reply with price, availability and lead time. In-stock parts ship within 24-72 hours and in-stock parts carry a 2-year warranty. Rebuilds are done in our shop or through the RestoPower repair network; work done in our shop carries a 1-year repair warranty, and we arrange getting the unit to the shop doing the work.

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