Gear pumps in general
Gear pumps are the most popular pumps used in modern hydraulic systems. Marzocchi gear pumps excel in versatility, power and long life span. The simple design of a gear pump ensures low maintenance costs and low purchase prices. Thanks to these properties (enriched by a continuous search into further development of the design, accuracy, choice of materials and production methods) these gear pumps are produced to the highest possible standard. Because of this a gear pump can be applied in heavy duty hydraulic applications without loss of hydraulic power. Above all our gear pumps have good mechanical and volumetric efficiencies, low noise levels, and last but not least low power to weight ratios. Marzocchi has different series of hydraulic gear pumps in their range of products which have each been designed for specific applications.
Series 0.25 & 0.5
These series gear pumps are very small oil pumps that are also known as micro pumps. They are available in 2 different series 0.25 and 0.5. The only difference between the series is the shape of the internal teeth. The housing, flange and cover are made of special high resistance aluminium alloys ensuring minimal distortion at maximum operating pressure or peak pressure. The housing is made by extrusion and the flange and cover are made by injection moulding. The gears are made from specially hardened steel with a precise surface treatment. The design of the right shape of the teeth of the gears ensure a low noise level when operating the Marzocchi oil pump. The complete series of 0.25 and 0.5 Marzocchi micro pumps is available from stock at Findynamica.
Direction of rotation
0.25 and 0.5 gear pumps are available in clockwise, counter-clockwise and bi-rotational configurations. When ordering it is important to indicate which configuration is required as the 0.25 and 0.5 gear pumps cannot be modified without changing extra parts.
Findynamica can also supply “RO” versions of Marzocchi 0.25 & 0.5 micro pumps. The “RO” gear pumps have been specially developed for high pressure applications and extreme operating conditions. P1, P2 and P3 operating pressures are increased by 20%. You can find the exact values in the product catalogue. “RO” pumps can only be supplied with “G”-type shaft.
It is possible to combine 0.25 & 0.5 micro pumps as multiple double pump. Because of this it is easily possible to add a second hydraulic circuit to the application.
0.25 and 0.5 pumps are used in many different hydraulic applications, so sometimes it is necessary to equip the gear pumps with special seals. Marzocchi 0.25 and 0.5 gear pumps can optionally be provided with the following seals:
- Option “V”; Viton seals, by using viton seals the 0.25 & 0.5 gear pump can withstand high temperatures. Temperature range will change to -10°C to +120°C, while maintaining operating pressure P1,P2 and P3 as indicated in the product documentation. A 0.25 & 0.5 pump with viton seals can also be used in temperatures up to +150°C if the maximum operating pressure does not exceed 20 bar.
- Option “ST”; these seals make a 0.25 & 0.5 hydraulic pump suitable for low as well as high temperatures. The pump can be used from -40°C to +120°C.
- Option “H’; HNBR seals, by using HNBR seals the 0.25 & 0.5 gear pumps can be used at low temperatures. The pump can be used for applications from -40°C to +80°C.
- Option “TR”, with this option the hydraulic pump can be used for applications with a high inlet pressure up to 6 bar. This option is also available in combination with option V, ST and H.
It is important that the installation regulations are followed when using a new Marzocchi pump. See the following link: