NSH71A / NSH100A Hydraulic Gear Pumps For Mobile Equipment

NSH71A and NSH100A gear pumps for mobile hydraulic systems

NSH71A-3 and NSH100A-3 cover nominal displacements of 71 and 100 cm³ per revolution in the larger A-series range. Olive Branch Hydraulics offers China-manufactured hydraulic gear pumps for agricultural, construction and mobile-equipment enquiries in Russian and CIS markets. Specify the complete model and rotation when requesting a configuration.

These pumps are offered under the Olive Branch Hydraulics brand with original-equipment quality positioning. A full marking, interface measurements and circuit requirements establish the proposed build. A shortened NSH100 enquiry can also refer to another construction family, so retain the A-series letter.

Model names and rotation references

NSH and NSh are Latin renderings of Cyrillic НШ. In this reference naming system, the Cyrillic suffix Л indicates left-hand, counterclockwise rotation viewed from the drive-shaft end. Latin enquiries commonly write L. Right-hand, clockwise references normally have no Л suffix. Russian descriptions use правое вращение and левое вращение. Check the direction arrow and oil-port arrangement on the actual pump.

Select displacement together with speed and drive capacity

The 71 and 100 designations describe volume per revolution, rather than fixed delivery in litres per minute. Theoretical flow equals displacement multiplied by speed, divided by 1,000. At 1,500 rpm, the calculated values are 106.5 L/min for 71 cm³/rev and 150 L/min for 100 cm³/rev. These are calculations before leakage, not measured delivery guarantees.

A larger pump can increase circuit flow at the same drive speed. Check drive power, inlet supply, valve capacity, return piping and heat rejection before changing displacement. The required continuous pressure and transient duty must be matched to the data sheet for the exact supplied build.

Mounting, shaft and oil-port checks

Shaft: spline or key profile, diameter, engagement length and projection from the flange.

Mounting: pilot diameter, bolt-hole pattern, flange thickness and clearance around the installed pump.

Connections: suction and delivery locations, bore sizes, fixing threads and pipe/flange orientation.

Duty: drive speed, flow demand, operating pressure, fluid and temperature conditions.

Retain the pressure-version, shaft, seal and climate suffixes from the original marking. Do not transfer NSH100M, small A-series or tandem-pump dimensions to a single NSH100A assembly. An equipment brand or a similar front flange does not establish an exact match.

Photos and installation drawing approval

The available photographs are supplier-labelled NSH100A-3L reference views. They illustrate the larger A-series construction and do not represent a separately photographed NSH71A, prove all suffix options or confirm dimensions. The accompanying NSH71A-3 / NSH100A-3 catalogue dimension drawing is a reference for interface comparison. Its dimensions are not an approval of every available shaft, port or rotation variant. Approve the actual pump photograph and final installation drawing for the configuration being ordered.

A machine-specific OEM or assembly number should be checked against the equipment parts-book entry. No universal OEM number is assigned to every NSH71A or NSH100A pump, and a GP code from another pump family is not automatically an equivalent order code.

OEM, distributor and sample enquiries

OEM/ODM configuration work and private-label packaging can be discussed against an agreed specification. Submit the model, quantity, complete marking and measured interfaces. The quotation identifies the proposed build, sample conditions, inspection requirements, packing and production timing.

For repeat orders, retain the approved drawing revision and complete order code. If the machine has been modified, include photographs of its current pump installation and connections rather than relying only on the original machine model.

Frequently asked questions

Are NSH100A-3 and НШ100А-3 different names for the same reference?

They are Latin and Cyrillic forms of the model designation. Check the complete suffix and physical configuration before ordering.

What does Л or L mean?

It identifies the left-hand rotation reference in this naming convention, viewed from the drive-shaft end. Confirm the actual arrow and port orientation.

Can a 100 cm³/rev pump replace a 71 cm³/rev pump?

Only after reviewing the hydraulic circuit and drive requirements. Equal shaft speed gives different theoretical flow.

Is NSH100M the same as NSH100A?

No. The series letter identifies a construction version and must be retained during selection.

Are the photographs individual NSH71A photographs?

No. They are NSH100A-3L reference views. Request the actual NSH71A build photograph and drawing for approval.

What information is needed for a quotation?

Send the full marking, quantity, rotation, equipment details and clear shaft, flange and oil-port photographs. Include a parts-book number or installation drawing if available.

Russian enquiry terms

Шестеренный гидронасос НШ71А-3, НШ100А-3, НШ71А-3Л, НШ100А-3Л. Укажите полную маркировку, направление вращения со стороны вала, рабочий объём и размеры соединений.