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NSH32MCH-4 / NSH50MCH-4 Cast-Iron Hydraulic Gear Pumps

Parameter	Specification
Brand / origin	Olive Branch Hydraulics / China
Pump family	External gear pump; cast-iron MCH-4 construction
Models / displacement	NSH32MCH-4: 32 cm³/rev; NSH50MCH-4: 50 cm³/rev
Russian references	НШ32МЧ-4; НШ50МЧ-4
Rotation	Confirm full suffix and shaft-end rotation
Interfaces	Shaft, flange and oil ports per approved drawing
Operating limits	Exact configuration data sheet required
Image reference	One MCH series photograph and catalogue dimension sheet

Product Information

NSH32MCH-4 and NSH50MCH-4 cast-iron gear pumps

The NSH MCH-4 family uses cast-iron pump housing construction and is distinct from the aluminium-bodied M-3 family. NSH32MCH-4 and NSH50MCH-4 have nominal displacements of 32 and 50 cm³/rev respectively. Olive Branch Hydraulics is a Chinese manufacturer supporting Russian and CIS hydraulic-equipment enquiries, with model and installation review before quotation.

The gallery photograph is a supplier-labelled MCH-4 series reference, rather than separate identified photographs of both displacement options. The catalogue dimension sheet covers the MЧ-4 construction and is an identification reference. Confirm the approved drawing and photograph for the actual quoted configuration before installation.

Model names and Cyrillic markings

Model reference	Alternative enquiry forms	Nominal displacement
NSH32MCH-4 / НШ32МЧ-4	NSh32MCh-4; NSH 32 MCH; НШ 32 МЧ	32 cm³/rev
NSH50MCH-4 / НШ50МЧ-4	NSh50MCh-4; NSH 50 MCH; НШ 50 МЧ	50 cm³/rev

MCH and MCh are Latin representations of the Cyrillic МЧ construction designation. Keep the Ч / CH characters and the -4 version when identifying a pump. NSH32M-3 and NSH32MCH-4 are not interchangeable names for the same specification. Equal displacement alone does not approve a replacement.

Housing construction and operating duty

Cast-iron housing construction is the defining material distinction of the MCH family. A dark housing colour alone does not establish material or model identity. Check the full marking and supplier drawing. Pressure ratings, speed limits, oil conditions and seal details must be confirmed for the supplied configuration; reference catalogue ratings must not be treated as test results for a different manufacturer’s unit.

Displacement is the theoretical oil volume moved per revolution. Delivered flow varies with speed, pressure, fluid viscosity and internal leakage. Changing from 32 to 50 cm³/rev changes both theoretical flow and drive loading at the same operating conditions. Compare the circuit requirement and available drive capacity before selecting the size.

Rotation and mounting checks

Record the full code and photograph the rotation arrow.

Specify clockwise or counter-clockwise rotation viewed from the shaft end.

Measure shaft diameter, spline profile, projection and coupling engagement.

Check flange pilot, bolt spacing, mounting face and installed envelope.

Confirm suction and pressure port dimensions, locations and pipe connections.

Provide pressure duty, drive-speed range, oil and temperature requirements.

The Cyrillic suffix Л is commonly represented by Latin L for left-hand rotation in the reference NSH designation system. Right-hand references may omit this suffix. Confirm the actual code and arrow rather than relying on an abbreviated sales description. Rotation is a configuration choice and does not require a separate duplicate product page.

Drawings and order confirmation

The catalogue drawing illustrates reference mounting and shaft arrangements. Do not apply every illustrated option to every pump. The approved supply drawing must identify the selected displacement, construction, rotation and interfaces. Equipment names and parts-book numbers support this review but do not independently prove fit.

Submit marking photographs, original dimensions and machine information.

Review model, housing construction, rotation and interfaces.

Approve the proposed configuration and required inspection documents.

Agree quantity, samples, marking, packaging and quotation terms.

Frequently asked questions

What distinguishes MCH-4 from M-3?

MCH-4 identifies the cast-iron construction family. Preserve the full model because construction and version details affect selection.

What sizes are covered here?

This range covers NSH32MCH-4 and NSH50MCH-4, with nominal 32 and 50 cm³/rev displacement.

Does MCH mean the same as МЧ?

MCH is a Latin transliteration of the Cyrillic МЧ construction designation.

Are the photos separate samples of both models?

No. The photograph is a supplier-labelled MCH series reference. Confirm the specific quoted model photograph with the drawing.

Does the drawing guarantee installation dimensions?

No. It is a catalogue reference; the approved configuration drawing governs the supplied unit.

How are price and lead time agreed?

They are confirmed in the quotation after model, quantity, configuration and documentation requirements are reviewed.

Request a configuration quotation

Send Olive Branch Hydraulics the full marking, rotation arrow, shaft and flange measurements, oil-port photographs, operating duty and quantity for configuration review and quotation.