Hydraulic Gear Pumps – Simple, Compact & Dependable Fixed-Displacement Flow
Techknow Engineering Enterprise is a hydraulic gear pump supplier serving OEMs, plant maintenance teams and system integrators across India. A hydraulic gear pump is one of the most widely used pump designs because it combines a simple construction, few moving parts and dependable fixed-displacement flow at a competitive cost.
Our range covers external gear pumps up to 280 bar and internal gear pumps up to 350 bar, with displacements from 0.25 to 250 cc/rev depending on the series. Pumps are available as single units or multiple units with a choice of shafts, flanges and port connections.
Techknow is an Authorized HYDAC Distributor and an external gear pump supplier for leading brands, so we can help you choose a new pump or find a like-for-like replacement for an existing one — backed by 14+ years of hydraulic experience and pan-India delivery.
External & Internal Gear Pumps for Every Circuit
Fixed-displacement gear pumps for mobile machinery, power packs and industrial hydraulic systems.
Gear pumps are positive displacement pumps: every revolution of the drive shaft delivers a fixed volume of oil. That makes them a natural choice for open circuits where a constant flow is needed, such as power units, presses, machine tools, material handling equipment and mobile machines.
Choosing Between External and Internal Gear Designs
An external gear pump uses two equal-size spur gears meshing inside a close-fitting housing. The design is compact, light and economical, and it tolerates a wide range of operating speeds — which is why the external gear pump is common on tractors, tippers, cranes and small power packs.
Pressure-balanced side plates in many designs limit internal leakage as pressure rises, helping the pump hold its volumetric efficiency.
An internal gear pump runs a smaller gear inside a ring gear with inward-facing teeth. Delivery is smoother and quieter, so internal gear designs suit injection moulding machines, presses and indoor installations where noise matters.
For oils above 220 cSt, special gear pumps are available for high-viscosity duty. See also our gerotor pumps for low-pressure lubrication and cooling circuits.
How a Hydraulic Gear Pump Works
As the drive gear turns the driven gear, the teeth unmesh at the inlet and create a low-pressure zone that draws oil in. The oil is trapped between the gear teeth and the housing, carried around the outside of the gears and forced out at the outlet as the teeth mesh again.
Because displacement is fixed, flow from a hydraulic gear pump is set by the shaft speed. System pressure is created by the load and limited by a relief valve in the circuit.
Selecting the Right Gear Pump
Start with the flow you need and the drive speed available — this gives the required displacement. Then confirm the maximum working pressure, direction of rotation, shaft and flange standard, port type and the oil viscosity range.
Our team checks these details against the pump series before quoting, and can match the mounting of an existing pump so a replacement drops straight into your machine.
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Authorized HYDAC Distributor in India
Techknow Engineering is an Authorized Distributor for HYDAC in India — supplying genuine HYDAC hydraulic pumps backed by OEM specifications and manufacturer support. Techknow is a hydraulic gear pump supplier and also a distributor and supplier for Rexroth, Parker, Yuken, Eaton-Vickers, Dowty, Polyhydron and Beiri Hawe hydraulic pumps — giving you one reliable source for gear pumps and the rest of your hydraulic system.
Gear Pump Specifications at a Glance.
Ratings vary by series and frame size — our team confirms the figures for your exact selection.
External Gear Pumps
For buyers looking for an external gear pump supplier, we offer compact two-gear designs for mobile machinery, power packs and general industrial circuits, with working pressure up to 280 bar.
Internal Gear Pumps
Smooth, low-noise delivery for presses, injection moulding machines and other industrial systems, with pressure up to 350 bar.
High-Viscosity Gear Pumps
Special gear pumps designed to handle high-viscosity oils above 220 cSt where standard pumps would struggle.
Pump Configurations
Supplied as single pumps or multiple units on a common shaft to feed separate circuits from one drive.
Mounting Variations
Available with multiple shaft, flange and port variations to suit new machines or match an existing installation.
Performance Features
High mechanical and volumetric efficiency, low-noise operation and a compact design with an excellent power-to-weight ratio.
Gear Pumps Powering Industries Across India
Our hydraulic gear pumps and hydraulic solutions are trusted across major industries demanding dependable flow, compact installation and uninterrupted performance.
Rolling, Pressing & Casting
Turbine Control & Emergency Backup
Turbine Governing & Dam Gates
Pitch Control & Braking Systems
Excavators, Cranes & Earthmovers
Press Shop, Body Shop & Assembly
Steering & Deck Machinery
Pulp Processing & Paper Production
Crushers, Kilns & Material Handling
Injection & Blow Moulding
Pressure Stabilization & Shutdown
Valve Actuation & Pressure Control
Why Industries Choose Us.
More than just a supplier — a partner who understands your system as well as you do.
14+ Years of Expertise
Years of work as a hydraulic gear pump supplier across mobile and industrial hydraulics means faster, more accurate pump selection.
Trusted Global Brands
We're an Authorized HYDAC Distributor, and a distributor and supplier for Rexroth, Parker, Yuken, Eaton-Vickers, Dowty, Polyhydron and Beiri Hawe.
Pan-India Delivery
From Mumbai to Delhi and Chennai to Gujarat, we deliver gear pumps and spares to plants and OEMs across India.
Expert Technical Guidance
We check displacement, pressure, speed, rotation and mounting before we quote, so the pump fits first time.
Obsolete Pump Replacement
As a hydraulic gear pump supplier with replacement experience, we propose an equivalent pump from the nameplate or dimensions of an old one.
Genuine Products
Every gear pump we supply comes from the original manufacturer with its documentation, so you know exactly what is installed.
Explore Our Hydraulic Gear Pump Range
Select the gear pump design that matches your pressure, noise and installation needs.
External Gear Pumps
An external gear pump is the most common gear pump design: two spur gears of equal size mesh inside the housing, one driven by the shaft and the other turning with it. The simple layout keeps the pump compact, light and economical to maintain.
External gear pumps are typically used in open circuits on mobile equipment, tippers, cranes, agricultural machinery, small power packs and lubrication systems. Techknow can supply external gear pump units with a choice of shafts, flanges and ports to match your machine.
Configurations & Specifications
- Working pressure: up to 280 bar (series dependent)
- Displacement: 0.25 – 100 cc/rev
- Single units and multiple units on a common shaft
- Multiple shaft, flange and port variations
Typical Applications
- Mobile machinery, tippers and cranes
- Hydraulic power packs and presses
- Material handling and agricultural equipment
- Lubrication and auxiliary circuits
Internal Gear Pumps
An internal gear pump uses a small external gear running inside a larger ring gear with inward-facing teeth. Oil is carried between the two gears and delivered with very little pulsation, giving smoother flow and lower noise than a typical external gear pump.
Internal gear pumps suit injection moulding machines, presses, machine tools and other industrial systems where quiet operation and stable pressure matter.
Configurations & Specifications
- Working pressure: up to 350 bar (series dependent)
- Displacement: 1.70 – 250 cc/rev
- Low-noise, low-pulsation delivery
- Can be combined with other pumps in multiple-pump assemblies
Multiple & Tandem Gear Pumps
Multiple gear pumps combine two or more pump sections on one shaft so a single motor or engine can feed separate circuits — for example, a main working circuit and a pilot or cooling circuit. This saves space and simplifies the drive arrangement.
Gear pumps are available as single units and multiple units with various flange mounting configurations. Tell us the flow and pressure needed in each circuit and we will propose a suitable combination.
Special Gear Pumps for High-Viscosity Oil
Standard gear pumps are designed for typical hydraulic oils. Where the fluid is much thicker — above 220 cSt — special gear pumps are available with designs suited to high-viscosity duty, helping to avoid poor filling, cavitation and noise at the inlet.
Share the fluid type and its viscosity across your operating temperature range so we can recommend the right pump.
Installation & Start-Up Tips
Fill the pump housing and suction line with clean oil before the first start, and never run a gear pump dry. Keep suction lines short and generously sized so inlet vacuum stays within the manufacturer limit.
Check the direction of rotation before start-up, align the coupling carefully, and fit a correctly set relief valve — a gear pump delivers its full flow regardless of load.
Maintenance & Service Life
Clean oil is the biggest factor in gear pump life. Use suitable suction filters and hydraulic oil filters, and keep oil temperature under control with an oil cooling system where needed.
Rising noise, falling flow or a hot pump body are early signs of wear. Our team can help you source a replacement hydraulic gear pump before an unplanned breakdown.
Why Choose Techknow as Your Hydraulic Gear Pump Supplier?
What Our Clients Say
Trusted by engineers and procurement heads across India's leading industries
FAQ'S
A hydraulic gear pump is a fixed displacement pump that moves oil in the spaces between gear teeth. As the gears rotate, the teeth separate at the inlet and draw oil in, carry it around the housing, and push it out at the outlet where the teeth mesh again. Each revolution delivers a set volume of oil, so flow rises in proportion to drive speed.
An external gear pump uses two spur gears of the same size meshing side by side, which keeps it simple, compact and cost-effective. An internal gear pump has a smaller gear running inside a ring gear, which gives smoother delivery and lower noise. On our current range, external gear pumps reach up to 280 bar and internal gear pumps up to 350 bar.
External gear pumps are available up to 280 bar with displacements from 0.25 to 100 cc/rev. Internal gear pumps are available up to 350 bar with displacements from 1.70 to 250 cc/rev. Exact ratings depend on the series and frame size, and our team confirms the figures for your selection.
Yes. Gear pumps can be supplied as single units or as multiple units on a common shaft, with different flange mounting options, so one drive can feed separate circuits.
Techknow is a hydraulic gear pump supplier and an Authorized HYDAC Distributor for HYDAC products, and we also supply hydraulic pumps from Rexroth, Parker, Yuken, Eaton-Vickers, Dowty, Polyhydron and Beiri Hawe. Share your existing pump details and we will propose a suitable gear pump from the range.
Yes. We work as an external gear pump supplier for machine builders who need pumps for new equipment, and for maintenance teams who need a replacement external gear pump that matches an existing shaft, flange and port arrangement.
Yes. Send us the nameplate details, displacement, shaft, flange and port information, and we will identify an equivalent replacement that fits your existing mounting with minimal changes.
Share the required flow or displacement, working pressure, drive speed, direction of rotation, shaft and flange type, port connections and the hydraulic fluid used. A photo of the nameplate is also helpful when you are replacing an existing pump.
Looking for a Hydraulic Gear Pump Supplier?
Share your flow, pressure, speed and mounting details with Techknow Engineering, an experienced external gear pump supplier, for expert guidance and a quotation for the right pump.
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