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 hydraulic gear pumps and motors available from jbj Techniques Limited are 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 on request.

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 for all types of industrial process, heavy plant, agricultural, offshore marine 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 duty 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 set 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 grade 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.

Valves

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.
ALP1 series hydraulic gear pump
ALP 1 series: hydraulic gear pumps with displacement from 1.4 to 13.8 cc/rev. max. speed 2,000 to 6,000 rpm, flow at 1500 rev/min 2.0 to 19.7 litres/min, depending on model.
ALP2 series hydraulic gear pump
ALP 2 series: hydraulic gear pumps with displacement from 4.5 to 35.2 cc/rev. max. speed 2,500 to 4,000 rpm, flow at 1500 rev/min 6.4 to 50.2 litres/min, depending on model.
ALP3 series hydraulic gear pump
ALP 3 series: hydraulic gear pumps with displacement from 20 to 87 cc/rev. max. speed 2,000 to 3,500 rpm, flow at 1500 rev/min 29 to 124 litres/min, depending on model.
ALP4 series hydraulic gear pump
ALP 4 series: hydraulic gear pumps with displacement from 87 to 200 cc/rev. max. speed 2,400 to 2,800 rpm, flow at 1500 rev/min 124 to 285 litres/min, depending on model.
GHP1 series hydraulic gear pump
GHP 1 series: hydraulic gear pumps with displacement from 1.4 to 13.8 cc/rev. max. speed 1,800 to 6,000 rpm, flow at 1500 rev/min 2.0 to 19.7 litres/min, depending on model.
GHP2 series hydraulic gear pump
GHP 2 series: hydraulic gear pumps with displacement from 4.5 to 35.2 cc/rev. max. speed 2,500 to 4,000 rpm, flow at 1500 rev/min 6.4 to 50.2 litres/min, depending on model.
GHP3 series hydraulic gear pump
GHP 3 series: hydraulic gear pumps with displacement from 20 to 87 cc/rev. max. speed 2,000 to 3,500 rpm, flow at 1500 rev/min 29 to 124 litres/min, depending on model.
Load sensing hydraulic gear motor
Load Sensing: hydraulic gear pumps with load sensing priority valve integrated into the cover split the flow rate into two different branches and allows fitting of relief valve.
Also the smaller 1P Series Gear Pumps and 0.25 - 0.5 Series Micro Gear Pumps.

A range of mounting flanges, output shafts, and ports are available to suit a variety of applications.

For quick cross reference grid of all gear pump and motor capabilities see www.jbj.co.uk/marzocchigearpumps.html

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
Questions?

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