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    20/30/40/50 GPM Hydraulic Gear Pump, 3600 psi

    5 out of 5 based on 3 reviews | Write a review
    Reliable manufacturer hydraulic gear pump for sale online. High displacement 20/30/40/50 Max. GPM for choose, working pressure 2900~3600 psi, speed 1500~2500 rpm, volumetric efficiency 90~93%, mechanical efficiency 82~85%, oil ports thread connection, multi-direction inlet/outlet is available, small size, economic price.
    SKU: ATO-HGPP-2345
    30-day Returns
    Free Shipping
    Delivery date: 6-12 days

    Hydraulic gear pump has high working pressure of 2900~3600 psi. Displacement 20/30/40/50 Max. GPM for selection, rated speed 1500rpm, maximum 2500 rpm. The hydraulic gear pump has small size and compact structure, applications include industrial/agricultural/commercial machinery, construction machinery, environmental protection equipment, and chemical equipment, etc.


    Model ATO-CBNZQ
    Displacement mL/ rev
    25 31.5 40 50 63 80
    Max. GPM (Gallon/min)
    16.5 20 26.4 30 40 50
    Rated Speed 1500 rpm 1500 rpm 1500 rpm 1500 rpm 1500 rpm 1500 rpm
    Max. Speed 2500 rpm 2500 rpm 2500 rpm 2500 rpm 2500 rpm 2500 rpm
    Min. Speed 500 rpm 500 rpm 500 rpm 500 rpm 500 rpm 500 rpm
    Rated Pressure 2900 psi (20 MPa)
    Max. Pressure 3600 psi (25 MPa)
    Volumetric Efficiency 90% 90% 90% 93% 93% 93%
    Mechanical Efficiency 82% 82% 82% 85% 85% 85%
    Way of oil in and out Rear in, rear out
    Installation Flange 110 x 86mm, φ 12mm
    Rotary Direction Right, Left


    1. Please use ATO gear pump with sufficient oil, otherwise there is a risk of burnout!
    2. Calculate the actual displacement value according to the formula: Gallon/min=displacement (ml/rev)*rated speed 1800rpm/3785.412L (speed variation range 500rpm-3000rpm).


    • Hydraulic gear pump uses high-strength aluminum alloy shell and alloy steel hard gear transmission, which is light in weight and stable in transmission.
    • Installation of the hydraulic gear pump is 110 x 86/φ12 standard flange. Input shaft connection is spline. Connection type of the oil inlet and outlet ports is threaded.
    • Hydraulic gear pump has an automatic compensation mechanism for axial and radial clearances, which enables the oil pump to maintain high volumetric efficiency and high mechanical efficiency for a long time.
    • Hydraulic gear pump uses metric gears, with small fluctuation, high pressure, low noise and stable performance.
    • Hydraulic gear pump uses composite material bearings and high-performance sealing elements, has a small starting torque and good tightness, and can work efficiently under harsh working conditions.
    • The oil inlet and outlet pipe joints can realize multi-directional inlet and outlet, and can be ordered in any combination according to users.

    20/30/40/50 GPM Hydraulic Gear Pump Dimensions Diagram (Unit: mm)

    Dimensions of 20/30/40/50 GPM Hydraulic Gear Pump, 3600 psi

    Displacement L A B
    25 mL/ rev 120 49.5 6
    31.5 mL/ rev 124 49.5 6
    40 mL/ rev 130 49.5 6
    50 mL/ rev 137 49.5 6
    63 mL/ rev 146 49.5 6
    80 mL/ rev 158 49.5 6


    According to the design requirements of 50 GPM hydraulic gear pump, the coaxiality between the rotation axis of the prime mover and the gear pump is not more than 0.1mm.

    Tips: How to use 50 GPM hydraulic gear pump correctly?

    1. It is recommended to use L-HM46 or hydraulic oil with similar viscosity in summer and L-HM32 or hydraulic oil with similar viscosity in winter. The working hydraulic oil temperature of 50 GPM hydraulic gear pump is -20℃-80℃. If the oil temperature is too high, it will seriously affect the life of the seals. Please choose a reasonable cooling system. In addition, pay attention to check the rated speed and rated pressure of the hydraulic gear pump. Over-speed and over-pressure work will also seriously affect its performance.
    2. Do not directly use belt pulleys, sprockets, gears, etc. to make the main shaft bear radial force without the drive bearing installed.
    3. When using the 50 GPM hydraulic gear pump for the first time, pay attention to the exhaust of the pipeline, so as not to cause unfavorable phenomena such as unstable pressure, insufficient pressure, insufficient flow, and loud noise.
    4. The running speed of 50 GPM hydraulic gear pump should not be lower than 500r/min, so as to avoid insufficient oil absorption, resulting in malfunction and damage to the gear pump.
    Existing reviews of 20/30/40/50 GPM Hydraulic Gear Pump, 3600 psi
    Hydraulic Gear Pump
    I wanted to purchase one but I didn't know if the pump head was compatible with my fluid, and what material the pump head and seals were made out of.
    From: Logan | Date: 06/11/2023
    Was this review helpful? Yes No (0/0)
    ATO Responded
    The seal used in this pump is nitrile rubber.
    What is your fluid medium? We also need to know the temperature, pressure, etc. of the fluid.
    Can you suggest valving to control the flow of this pump?
    Can you suggest valving or other ways to control the flow of this pump?
    Maybe simply by adjusting the pump RPM?
    From: peggy | Date: 21/07/2023
    Was this review helpful? Yes No (0/0)
    ATO Responded
    The pressure regulating valve is used to control the pressure, and the RPM needs to be adjusted to control the flow of the pump.
    So we do not recommend using valves to control the flow.
    I want to order another 3600 psi hydraulic gear pump
    The first time I bought this 3600 psi hydraulic gear pump, I asked you many questions, and ATO customer service answered my questions patiently. Due to your excellent customer service, I decided to order another 3600 psi hydraulic gear pump.
    From: Chico | Date: 22/07/2021
    Was this review helpful? Yes No (0/0)
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