link to contact details for jbj Techniques Ltd link to product list from jbj Techniques Ltd link to home page for jbj Techniques Ltd link to general information, items of interest and news page from jbj Techniques Ltd link to list of on-line catalogues from jbj Techniques Ltd

External gear pumps are the most popular pumps used in modern hydraulic systems.

These external gear pumps feature versatility, strength and long useful life.
Their simple construction ensures limited purchase costs and servicing. Thanks to these basic concepts, together with ever-improving product design and features, research-based on many years of experience, accuracy in material selection, production process followed in great detail and tests on mass-produced parts, our gear pumps have reached top quality standards.
Basic Marzocchi gear pump assembly

For this reason, our products can work under heavy operating conditions and transmit high hydraulic power. Furthermore, Marzocchi pumps feature good hydraulic, mechanical and volumetric efficiency, low noise level and, last but not least, compact dimensions.

Generally these gear pumps usually consist of a gear pair supported by two aluminum bushes, a body, a securing flange and a cover.

Shaft of the driving gear projecting beyond the flange mounts a twin-lip seal ring (the inner lip being a seal and the outer being a dust seal). An elastic securing ring secures the ring in place.

Link to Marzocchi finite element analysis      Link to Marzocchi geap pump / motor selection data      Link to Marzocchi gear motor high pressure seal
Marzocchi gear pumps and motorsThe body of the pump is made of special hi-resistant aluminum alloy obtained through extrusion process, while flange and cover are made out of spheroidal cast iron; this in order to ensure minimized deformation even when subject to high pressure, be it continuous or intermittent or peak pressure.
Gears are made of special steel. Their manufacturing process includes case-hardening and quench hardening. Then gears are ground and fine finished so to have a high degree of surface finishing. Proper tooth profile design and geometric proportions ensure low pulsation levels and low noise levels during pump operation.
Bushings are made of special low-friction and hi-resistant aluminum alloy and manufactured from die-casting. Besides they are equipped with antifriction DU bearings.
Special compensation zones onto bushings, insulated by special preformed seals with anti-extrusion ring, allow fully free axial and radial movement to the bushes, which is proportional to pump operating pressure. In this way, internal dripping is dramatically reduced, thus ensuring very good pump performance (both in terms of volume and in general) and proper lubrication of pump moving parts.

There are many pump varieties within the excellent Marzocchi range for most applications.
Please contact the jbj Techniques Limited technical department for further details and assistance in specifying the correct pump for your application, but please take a look at the specifications.