External gear pumps are the most popular pumps used in modern hydraulic systems. They 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.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 and low weight/power ratio.
A gear pump usually consists of a gear pair supported by two aluminum bushes for groups 0.25, 0.5 and 1P, or bushes with plain bearings coated with antifriction material for groups 1, 2, 3 and 4, 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, the outer lip being a dust seal) for groups 0.25, 0.5 and 1P, or two opposed single-lip seal rings (the outer being a dust seal) for groups 1, 2, 3 and 4.
Pump body, flange and cover are made of special hi-resistant aluminum alloys for minimized deformation even when subject to high pressure, be it continuous or intermittent or peak pressure. The body is profiled by means of extrusion, whereas flange and cover are obtained by means of die-casting (even gravity die-casting for some models).
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. Bushes are made of special low-friction and hi-resistant aluminum alloy and manufactured from die-casting.
Special compensation zones onto flange and cover, insulated by special seals with anti-extrusion rings, 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.
Gear Micro Pumps
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High performances micropumps. Displacement form 0.19 up to 1.5 cc/rev. Available also 'RO' high pressure version and reversible rotation. Special version and integrated system available on request for all industrial, mobile, automotive applications.
0.25 - 0.5
How to order 0.25 - 0.5 products
Group 0.25
Version RO
Displacement
From 0.19 to 0.64 cm3/rev
From 0.19 to 0.64 cm3/rev
Max. Continuous Pressure
190 bar
230 bar
Max. Intermittent Pressure
210 bar
250 bar
Max. Peak Pressure
230 bar
270 bar
Max. Speed
7000 rpm
7000 rpm
Group 0.5
Version RO
Displacement
From 0.50 to 1.50 cm3/rev
From 0.50 to 1.50 cm3/rev
Max. Continuous Pressure
190 bar
230 bar
Max. Intermittent Pressure
210 bar
250 bar
Max. Peak Pressure
230 bar
270 bar
Max. Speed
From 4000 to 7000 rpm
From 5000 to 7000 rpm
1P
How to order 1P products
Group 1P
Displacement
From 1.1 to 8 cm3/rev
Max. Continuous Pressure
230 bar
Max. Intermittent Pressure
250 bar
Max. Peak Pressure
270 bar
Max. Speed
From 2100 to 6000 rpm
ALP1
How to order ALP1 products
Group ALP1
Displacement
From 1.4 to 13.8 cc/rev
Max. Continuous Pressure
250 bar
Max. Intermittent Pressure
270 bar
Max. Peak Pressure
290 bar
Max. Speed
6000 rpm
ALP2
How to order ALP2 products
Group ALP2
Displacement
From 4.5 to 35.2 cc/rev
Max. Continuous Pressure
250 bar
Max. Intermittent Pressure
270 bar
Max. Peak Pressure
290 bar
Max. Speed
4000 rpm
ALP3
How to order ALP3 products
Group ALP3
Displacement
From 20 to 87 cc/rev
Max. Continuous Pressure
230 bar
Max. Intermittent Pressure
250 bar
Max. Peak Pressure
270 bar
Max. Speed
3500 rpm
ALP4
How to order ALP4 products
Group ALP4
Displacement
From 87 to 200 cc/rev
Max. Continuous Pressure
240 bar
Max. Intermittent Pressure
260 bar
Max. Peak Pressure
280 bar
Max. Speed
2800 rpm
GHP1
How to order GHP1 products
Group GHP1
Displacement
From 1.4 to 13.8 cc/rev
Max. Continuous Pressure
270 bar
Max. Intermittent Pressure
290 bar
Max. Peak Pressure
310 bar
Max. Speed
6000 rpm
GHP2
How to order GHP2 products
Group GHP2
Displacement
From 4.5 to 28.2 cc/rev
Max. Continuous Pressure
280 bar
Max. Intermittent Pressure
295 bar
Max. Peak Pressure
310 bar
Max. Speed
4000 rpm
GHP3
How to order GHP3 products
Group GHP3
Displacement
From 20 to 87 cc/rev
Max. Continuous Pressure
280 bar
Max. Intermittent Pressure
295 bar
Max. Peak Pressure
310 bar
Max. Speed
3500 rpm
ALM1
How to order ALM1 products
Group ALM1
Uni-directional motors
Bi-directional motors
Displacement
From 2.8 to 13.8 cc/rev
From 2.8 to 11 cc/rev
Max. Continuous Inlet Pressure PI
250 bar
250 bar
Max. Continuous Backpressure PC
6 bar
240 bar
Max. Peak Inlet Pressure PP
290 bar
270 bar
Max. Speed
6000 rpm
5000 rpm
Max. Drain Line Pressure
----
6 bar
ALM2
How to order ALM2 products
Group ALM2
Uni-directional motors
Bi-directional motors
Displacement
From 4.5 to 35.2 cc/rev
From 4.5 to 28.2 cc/rev
Max. Continuous Inlet Pressure PI
250 bar
250 bar
Max. Continuous Backpressure PC
6 bar
240 bar
Max. Peak Inlet Pressure PP
290 bar
270 bar
Max. Speed
4000 rpm
4000 rpm
Max. Drain Line Pressure
----
6 bar
ALM3
How to order ALM3 products
Group ALM3
Uni-directional motors
Bi-directional motors
Displacement
From 20 to 87 cc/rev
From 22 to 87 cc/rev
Max. Continuous Inlet Pressure PI
230 bar
230 bar
Max. Continuous Backpressure PC
6 bar
220 bar
Max. Peak Inlet Pressure PP
270 bar
250 bar
Max. Speed
3500 rpm
2500 rpm
Max. Drain Line Pressure
----
6 bar
GHM1
How to order GHM1 products
Group GHM1
Uni-directional motors
Bi-directional motors
Displacement
From 2.8 to 13.8 cc/rev
From 2.8 to 11 cc/rev
Max. Continuous Inlet Pressure PI
250 bar
250 bar
Max. Continuous Backpressure PC
6 bar
240 bar
Max. Peak Inlet Pressure PP
290 bar
270 bar
Max. Speed
6000 rpm
5000 rpm
Max. Drain Line Pressure
----
6 bar
GHM2
How to order GHM2 products
Group GHM2
Uni-directional motors
Bi-directional motors
Displacement
From 4.5 to 35.2 cc/rev
From 4.5 to 28.2 cc/rev
Max. Continuous Inlet Pressure PI
250 bar
250 bar
Max. Continuous Backpressure PC
6 bar
240 bar
Max. Peak Inlet Pressure PP
290 bar
270 bar
Max. Speed
4000 rpm
4000 rpm
Max. Drain Line Pressure
----
6 bar
GHM3
How to order GHM3 products
Group GHM3
Uni-directional motors
Bi-directional motors
Displacement
From 20 to 87 cc/rev
From 22 to 87 cc/rev
Max. Continuous Inlet Pressure PI
230 bar
230 bar
Max. Continuous Backpressure PC
6 bar
220 bar
Max. Peak Inlet Pressure PP
270 bar
250 bar
Max. Speed
3500 rpm
3500 rpm
Max. Drain Line Pressure
----
6 bar
ALP/GHP
How to order ALP/GHP products
Group ALP/GHP
Displacement
From 1.9 to 200 cc/rev
Continuous Max. Pressure
250 bar
Intermittent Max. Pressure
270 bar
Peak Max. Pressure
290 bar
Max. Speed
6000 rpm
HL
How to order HL products
Group HL
First stage smaller displacement High pressure
From 1.1 to 8.3 cm3/rev - P1= up to 250 bar
Second stage bigger displacement Low pressure
From 3.7 to 35.2 cm3/rev - (pressure set by unloading valve)
Unloading valve
Standard setting from 30 to 50 bar, special settings on request
RPM range
From 1000 rpm to 3500 rpm
Ports
Common inlet. Common outlet. Side ports code FG, FA, D
Flange and shafts
According to the HL pump type
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A new family of multiple pumps with a reduced length. These pumps fit very well any application where many pumps have to be driven by just one motor and the space is too narrow for standard multiple pumps. Available displacements vary from 1.4 to 13.8 cm3/rev for group 1 and from 4.5 to 35.2 cm3/rev for group 2.
These particular multiple pumps can be supplied with 2 or 3 elements and in 2 versions: ALPC (all aluminum) or GHPC (cast iron flange and cover).
Short Multiple pumps are available with different configurations of flanges, shafts, inlet and outlet ports, and there is also a common inlet version with only one port feeding two or three
ALPC GHPC
How to order ALPC GHPC products
Group ALPC/GHPC
Displacement
From 1.4 to 35.2 cm3/rev. Max. pressure 270 bar
RPM range
From 1000 rpm to 4000 rpm
Ports
Common inlet (option) -
Side ports code E; EP; FG; FC; FA; D (according to the pump type);
Rear ports KA (only Group 2)
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.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 and low weight/power ratio.
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