Bucher QYEH Low-Noise Internal Gear Pump Unit

Description

Bucher QYEH Low-Noise Internal Gear Pump Unit

The QYEH series is an internal gear unit optimized for variable-speed drives over a wide speed range and for reverse operation. Bucher describes a compact construction with a special gear geometry and two moving components, intended to support low noise and low pulsation while handling cyclic loads.

This INTEREQ listing covers the Bucher Hydraulics QYEH product family for identification, replacement enquiries and quotation support. Its product image is an original family illustration and does not depict a confirmed part number or selected configuration. Options and limits vary within a series; confirm the complete manufacturer code before ordering.

Technical specifications

Applications

Hydraulic presses, machine tools, waste compactors, lift drives, pressure die-casting machines and hydraulic power units where the selected QYEH model matches the duty cycle. Final suitability depends on the machine, hydraulic circuit, duty cycle and installed component configuration. Check the equipment documentation and the manufacturer’s current data before specifying a replacement.

Key features and compatibility

The manufacturer lists high efficiency, a wide speed range, reversible operation and double-unit configurations. Exact values differ by type: listed models span 10 to 124.5 cm³/rev, with speed falling as size and displacement increase. Confirm the full model code, fluid, drive, ports, flange and operating point with the current datasheet. Interfaces are model-specific. Do not assume that units sharing a series name have matching shafts, flanges, ports, rotation, controls or seals. Published family ranges are identification guides and must not be treated as ratings for every size or combination.

Model identification and replacement selection

Do not select a replacement by brand and series alone. Compare the full nameplate code and confirm displacement, rotation, shaft, mounting flange, port arrangement, controls, case-drain requirements and hydraulic circuit against the installed unit and machine documentation. Send INTEREQ a clear nameplate photo and machine make/model for identification.

For a quotation, provide the full type code, machine model, operating conditions and any available drawing or nameplate image. Condition, availability and technical fit are confirmed for the specific unit offered.

System sizing and replacement check

For system sizing, compare pump displacement and shaft speed with the required flow, then check continuous and intermittent pressure against the machine duty cycle. Confirm inlet conditions, fluid viscosity and cleanliness, operating temperature, case pressure where applicable, drive power and external shaft loads. These conditions affect performance and service life; a series maximum is not an operating target for every unit.

When the installed type code is incomplete, include clear photos of the nameplate, mounting face, shaft and port layout. Provide the machine make/model, current circuit details and operating conditions so the replacement can be checked against the correct manufacturer data sheet.

Related Bucher Hydraulics product families

• QX internal gear pumps
• QXEH variable-speed pumps
• QXEM multi-quadrant units

Hydraulic service parts and supply

For maintenance or repair of the Bucher QYEH Low-Noise Internal Gear Pump Unit, INTEREQ can source and supply compatible hydraulic service parts, including pumps, motors, control valves and related components. We check the complete type code, machine or system application, compatibility and availability before quotation.

Browse all Hydraulic Pumps & Motors or view Bucher hydraulic products.

Manufacturer reference: Bucher Hydraulics product information for the QYEH family.

For pricing, availability, inspection details and international delivery options, please contact us using the inquiry form below.