Gear pump inspection service

Gear Pump Inspection Service for Global Industrial and Mobile Hydraulic Markets

As an ISO/IEC 17025 accredited laboratory, we deliver a comprehensive gear pump inspection service that covers material integrity, hydraulic performance, pressure containment, durability, and dimensional accuracy. Our gear pump inspection service supports manufacturers and exporters of external, internal, and specialty gear pumps who must demonstrate compliance with ISO, SAE, EN, and regional safety directives for the European Union, North America, the Middle East, and Asia. Every test is conducted under our CNAS-accredited scope, producing reports accepted by notified bodies, hydraulic system OEMs, and procurement authorities worldwide.

Product Samples We Regularly Test in Our Gear Pump Inspection Service

External gear pumps — for hydraulic power units, lubrication systems, and fuel transfer
Internal gear pumps — for viscous fluids, polymers, asphalt, and food-grade transfer
High-pressure gear pumps — for hydraulic presses, injection molding, and construction machinery
Magnetic drive gear pumps — for chemical, solvent, and hazardous fluid handling
Stainless steel gear pumps — for pharmaceutical, food, beverage, and cosmetic processes
Tandem and multi-stage gear pumps — for compact high-pressure circuits in mobile and industrial equipment
Cast iron and aluminum gear pumps — for general industrial, agricultural, and mining applications

Hydraulic Performance and Efficiency Testing in Our Gear Pump Inspection Service

Flow rate and volumetric efficiency measurement per ISO 8426 and SAE J745 — delivering the delivered flow at rated speed and a series of pressure steps to determine slip loss and volumetric efficiency, providing the core performance curve for the pump.
Overall and mechanical-hydraulic efficiency mapping — input torque and output hydraulic power are measured across the full speed and pressure operating envelope, calculating overall efficiency to support system energy assessments and regulatory compliance.
Pressure ripple and pulsation analysis — high-frequency pressure transducers at the pump outlet quantify the amplitude and frequency of flow pulsation, critical for noise prediction and hose life estimation.
Suction performance and cavitation testing per ISO 4411 — the minimum inlet pressure required to avoid cavitation is determined by monitoring flow drop-off and noise at varying inlet restrictions, ensuring the pump can operate on existing reservoir designs.
Low-temperature start-up and high-temperature endurance — measuring torque and flow at cold start conditions and verifying stable performance after prolonged operation at maximum fluid temperature.

Pressure Integrity and Leakage Testing of Gear Pumps

Hydrostatic pressure test per ISO 4413 and EN 12162 — the pump housing and seals are subjected to a minimum of 1.5 times the maximum rated working pressure, held for a code-specified duration without visible leakage, deformation, or pressure decay.
Shaft seal and gasket leakage assessment — measuring external leakage rate at the drive shaft and body joints under maximum pressure and temperature using a calibrated drip meter or absorbent pad gravimetric method.
Burst pressure verification — hydraulic ramping of the pressure-containing envelope until rupture, determining the ultimate safety factor and confirming the failure mode is non-fragmenting.
Case drain flow and internal leakage characterization — measuring the flow returning to tank through the case drain at various pressures to quantify internal leakage across the gears and bearings.

Mechanical Integrity, Endurance, and Vibration Testing of Gear Pumps

Endurance and accelerated life test per ISO 4409 — continuous operation at rated pressure and speed for a minimum of 1000 hours or the specified design life, with periodic performance checks and oil sample analysis to track wear metal trends.
Cyclic pressure and impulse fatigue testing — applying pressure pulses from zero to rated pressure for hundreds of thousands of cycles to simulate the repetitive loading of directional control and mobile hydraulic circuits.
Vibration measurement on housing and bearings per ISO 10816-7 — triaxial accelerometer measurements on the pump casing, bearing housings, and mounting feet to classify vibration severity and detect misalignment, unbalance, or gear mesh defects.
Torque ripple and shaft deflection measurement — using a dynamic torque sensor and dial indicators to measure torsional oscillations and shaft runout under load, ensuring smooth power transmission.
Post-test strip-down and gear wear analysis — microscopic examination of gear teeth, bearing surfaces, and wear plates after endurance testing to evaluate scuffing, abrasive wear, and cavitation erosion patterns.

Material Verification and Chemical Analysis in Our Gear Pump Inspection Service

Optical emission spectrometry for alloy verification per ASTM E415 and ISO 14284 — confirming the body, flange, gear, and shaft materials meet the specified grades such as grey cast iron, ductile iron, 316L stainless steel, or 6061 aluminum.
Hardness testing per ISO 6506-1 and ISO 6507-1 — Brinell and Vickers hardness measurements on gear teeth, shafts, and wear plates to verify heat treatment quality and wear resistance.
Metallographic examination of gear and housing sections — evaluating graphite morphology in cast irons and grain structure in steels to confirm structural integrity and freedom from shrinkage porosity.
Surface hardness and case depth on nitrided or carburized gears — microhardness traverses per ISO 2639 to verify the case depth meets the required specification for contact fatigue resistance.

Dimensional, Geometric, and Assembly Inspection for Gear Pumps

Gear tooth profile, lead, and backlash measurement — using gear measuring machines and coordinate measuring machines per ISO 1328 and AGMA 2000 to verify tooth geometry, ensuring quiet meshing and volumetric consistency.
Housing bore diameter, roundness, and alignment — CMM and air gauging verification of bearing bores and gear cavity geometry to confirm the running clearances are within the design tolerance band.
Flatness and surface finish of mounting faces and port flanges — per ISO 4287 profilometry and surface plate checks to ensure leak-free assembly with mating components.
Port thread and flange connection dimensional control — verifying conformance to ISO 6149, SAE J518, or customer-specific port standards using thread and flange gauges.

Surface Treatment, Coating, and Corrosion Resistance Testing of Gear Pumps

Neutral salt spray testing per ISO 9227 and ASTM B117 — the complete pump or representative painted/plated panels are exposed to salt fog for 240 to 720 hours to assess red rust and white corrosion on cast iron and steel components.
Paint adhesion and coating thickness measurement — cross-cut test per ISO 2409 and magnetic induction thickness measurement per ISO 2178 to verify the specified primer and topcoat system durability.
Chemical compatibility with hydraulic fluids and cleaning agents — immersion of seals, gaskets, and housing materials in representative fluids per ISO 1817, followed by Shore hardness and tensile retests to confirm material compatibility.

Report Recognition and ISO/IEC 17025 Compliance

All methods described in this gear pump inspection service fall within our ISO/IEC 17025 scope of accreditation. Our reports are accepted by European notified bodies under the Machinery and Pressure Equipment Directives, by North American hydraulic system OEMs, and by regulatory and procurement authorities in the Middle East, Australia, and Asia. Whether you require a complete qualification for a new gear pump platform, a batch release inspection for export, or a root cause failure analysis, our laboratory delivers the measurement accuracy and hydraulic system expertise that global supply chains demand.