Gear oil pump QX Series QX42-025R29

Product Description

Hengmeisi Gear oil pump QX Series QX42-025R29 – professional China factory direct replacement for Bucher. With 25cc/rev displacement, it runs steadily at 250 bar continuous / 280 bar peak pressure, delivers 92% volumetric efficiency and ultra-low flow ripple – ideal for small-sized compact hydraulic power units.

Product Advantages

Optimized Internal Meshing vs Ordinary External Gear Pump

Different from conventional external gear pumps, Internal Gear Pump QX42 Series QX42-025R29 adopts precision inner-outer gear engagement design. It reduces gear meshing friction and internal leakage, achieving higher pressure resistance and stable oil output.

Exclusive R29 Custom Configuration Standard

QX42-025R29 matches R29 customized specification for mounting flange and oil port layout, which fits standard small-size IEC motors for direct installation, effectively saving the installation space of mini hydraulic stations.

Premium Wear-resistant Raw Materials

Gear set: Alloy steel with carburizing heat treatment & precision grinding for outstanding anti-wear performance;

Standard Seal: NBR rubber seal, optional FKM high temp seal, applicable for -20℃~+80℃ hydraulic oil environment;

High precision roller bearings cut running friction and extend the service life of QX42-025R29.

Low Noise Running Design

Optimized curved tooth profile suppresses meshing impact noise, QX42-025R29 operating noise ≤75dB(A), suitable for quiet precision equipment assembly.

Model Code

QX42-025R29 has easy-to-read coding rules for global buyers to check specs without professional hydraulic knowledge:

QX = Internal meshing gear pump core series code;

42 = QX42 series pump housing size specification;

025 = Rated displacement:25cc/rev;

R = Right-hand rotation (clockwise from drive shaft end);

29 = Custom code including flange dimension, oil port direction and standard sealing configuration.

As the mainstream compact model of QX42 series, QX42-025R29 is in stock at Hengmeisi China factory for quick replacement of imported original pumps.

Product Structure

Core Architecture: Floating side plate compensation internal gear structureQX42-025R29 consists of high-strength cast pump housing, precision alloy gear pair, automatic floating side plate and integrated sealing assembly. Floating plate automatically compensates internal clearance to minimize leakage under high pressure.

R29 Standard Installation SpecificationR29 fixed flange and oil port layout of QX42-025R29 conform to universal mini hydraulic unit mounting standard, convenient for on-site old pump replacement.

Material ConfigurationGear components: Heat-treated alloy steel + fine grinding for long-term heavy-load operation;Pump housing: High-density cast alloy, anti-deformation under instantaneous 280bar peak pressure;Seal assembly: NBR default, FKM optional for high-temperature harsh working condition.

Application Scenarios

Precision machinery: Small CNC grinders, miniature hydraulic bending equipment

Plastic machinery: Auxiliary hydraulic system for small injection molding machines

Lifting industry: Small warehouse lifting platforms, compact stationary lift units

Automation equipment: Hydraulic fixture, miniature custom hydraulic power packs

General industry: Light machinery auxiliary hydraulic station, small sanitation vehicle hydraulic system