jbj Techniques Ltd; an excellence in engineering
quality products for mechanical & fluid power

Gear Pumps

With displacements from 0.19 to 200.3 cc/rev and maximum continuous working pressures of up to 280 bar this range of gear pumps satisfies demands of a wide range of applications.

external gear pumps from jbj Techniques Limited
External gear pumps, the most popular pumps used in modern hydraulics systems.

The combination of FEM (finite element method) simulation and modern production techniques has seen one range of hydraulic systems satisfy demands for efficiency, reliability and reduced noise.

The range of Marzocchi gear pumps and motors available from jbj Techniques Limited and held in large stocks for next day delivery.
The range of hydraulic gear pumps is available in single or multiple pump format and can be supplied with integral relief valve.

Not just huge stocks of gear pumps available for next day delivery but the technical expertise to specify for complex and simple applications alike . . . you name the application, we specify the pump.

These external gear pumps feature versatility, strength and long useful life.
external gear pump exploded diagram of basic pump parts
These hydraulic gear pumps have high overall efficiencies, normally above 90%. The product range is available in various mounting formats including SAE and DIN.

A complete range of reversible units and gear motors compliment the range of hydraulic pumps and motors for all types of industrial process, heavy plant, agricultural and commercial equipment.

You name the application, we specify the gear pump.

Links to further gear pump information:

» Link to high pressure seal radial sealing at the shaft that can bear enormous internal over-pressures without resulting in damage.

» Design simplicity versatility, strength and long useful life. Simple construction ensures limited purchase costs and servicing.

» Link to technical specifications of each series of gear pump and gear motor.

» Link to 2 stage, high / low gear pumps ideal pump for applications which require a fast approach and /or return of the actuator at low loads and slow motion of the actuator at high loads. eg. waste compactors, log splitters, clamping, crimping, etc.

» Link to low noise, low pulsation gear pumps 15dBA lower noise levels than standard gear pumps. Higher working pressures up to 300 bar and higher performance

» Link to Gear pump summary.

» Link to jbj Techniques, UK distributor for Concentric AB hydraulics. (formerly Haldex).

» Link to Haldex GPA low noise internal gear pumps.

Basic design and construction of external gear pumps.

External gear pumps, the most popular pumps used in modern hydraulics systems feature versatility, strength and long useful life.
Their simple construction, compared to other types (piston, orbital, etc) ensures cost effective purchasing and servicing.

These hydraulic gear pumps and motors can work under heavy operating conditions and transmit high hydraulic power, feature good hydraulic, mechanical and volumetric efficiency, low noise level and, last but not least, compact dimensions and low weight/power ratio. Ideal for both industrial and mobile industry sectors.

The basic components consist of a gear pair supported by two aluminum bushings, a body, a securing flange and a cover.
The shaft of the driving gear projecting beyond the flange mounts a seal ring coupled with a metallic ring to strengthen the setup. Both rings are held in place by an elastic securing ring.

The body is made of a special aluminium alloy with high strength for minimized deformation even when subject to high pressure.
Flange and cover are made out of cast iron or aluminium alloy, depending on the model series type, manufactured through a process of continuous flow casting and with a final surface treatment of phosphating.

Gears are made of special steel. Their manufacturing process includes case-hardening and quench hardening. The gears are ground and fine finished to achieve a high degree of surface finishing. Good tooth profile design and geometric proportions ensure low pulsation levels and low noise levels during motor operation.

Bushings are made of special low-friction and high-resistant aluminium alloy and manufactured from die-casting that have excellent high strength and anti-friction characteristics. Also equipped with anti-friction DU bearings with tight tolerance.

Special and symmetric compensation zones onto bushings, insulated by special preformed seals with special anti-extrusion ring, allow full free axial and radial movement to the bushings, which is proportional to motor operating pressure. In this way, internal leakage is dramatically reduced, ensuring very good pump performance (both in terms of mechanical and total efficiencies) and proper lubrication of pump moving parts.


The 1P VM cover kit contains
1) 1P VM cover
2) 1P VM cartridge
3) 1P VM spring 5/90 bar
4) 1P VM spring 91/280 bar
5) Grub screw
6) Spring holder disc.
7) Pin.
8) or number 3
9) Watertight cap.
10) Anti-extrusion (not shown in drawing).
11) Preformed seal (not shown in drawing).
12) Anti-extrusion.
1PVM cover kit.
This kit is sent already assembled but uncalibrated. The 1PVM spring (number 4) for medium - high calibrations
is provided unassembled.
The relief valve is calibrated using the grub screw (number 5).
When used at pressure higher than 90 bar the spring already assembled in the cartridge must be changed as follows:

» Unscrew the watertight cap (number 9) and the grub screw (number 5).
» Change the medium - low calibrated spring (number 3) with the medium - high calibrated spring (number 4).
» Screw the grub screw (number 5) on top of the cartridge (number 2) until the desired pressure is reached.
» Screw the watertight cap by a 30/35 Nm bolt torque equivalent to 22.1/25.8 lb ft.

Here to help you.

High quality mechanical and fluid power products are always available straight from our comprehensively stocked warehouse, but, we are more than that! If you need more, be it the smallest drive component through to complex drive line component packages, then speak to our experienced sales team who will provide a solution based upon your application requirements.

An experienced and dedicated team of technical sales engineers are on hand to work with customers and deliver results. The markets where jbj operate are tough and time sensitive. In such circumstances customers need reliable solution partners, people who are conscious of deadlines, innovative in design and always willing to seek the best solution for the customers' needs.
On all counts, jbj Techniques Limited deliver. From specification, through technical advice, manufacture and support, together with our extensive product database, jbj Techniques provide a comprehensive and valued service to the power transmission and hydraulic industries.
Specification of Marzocchi gear pumps and motors found in this on-line » library « link
Specification of Concentric gear pumps and motors found in this on-line » library « link

jbj Techniques Limited
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telephone: +44 (0)1737 767493
happy to help at jbj Techniques Limited, quality products for mechanical and fluid power