ISO 6336 in Practice: Why 1,500 N·m Reducer Testing Exposes Gearbox Claims a Datasheet Can Never Show

Every reducer datasheet quotes rated torque. Almost none quote oil pool temperature rise after eight hours at load. That is the number that decides whether a gearbox survives its first year in the field.

1. What a reducer bench measures that a catalogue cannot

A gearbox is a stack of losses and thermal limits, not a single torque figure. The ISO 6336 reducer dynamometer test system resolves input torque, speed and power against output torque, speed and power, then reports efficiency, temperature rise, vibration and noise in the same run. It is built around ISO 6336 gear-loading practice and is intended for the full range of reducer types rather than one family.

2. Ten test items, one test plan

1. Appearance and structural inspection — cracks, deformation, seal condition.
2. Performance testing — torque, power, efficiency at defined load points.
3. Load test — behaviour at partial and full load, including output torque stability.
4. Durability test — extended running to establish long-term reliability.
5. Heat treatment verification — performance stability in a high-temperature environment.
6. Noise test — measured against the applicable noise standard, not an opinion.
7. Vibration test — identifies damage, indentation or rust that disturbs normal running.
8. Temperature test — oil pool and bearing rise under continuous load.
9. Lubricant test — oil quality and suitability for the duty cycle.
10. Safety performance — overload and short-circuit protection response.

3. The parameters that carry the argument

4. Energy recovery is not a footnote

The loading system uses variable-frequency feedback, so the power absorbed by the load machine is returned to the supply rather than burned as heat. Measured saving is not less than 75% of the energy a dissipative brake would consume. On a durability test that runs for weeks, that difference is often what makes the test economically possible in the first place.

5. Engineering provenance

The system is manufactured by Guangzhou Hejin Automation Control Technology Co., Ltd. in Guangzhou, operating since 2003, with 50–100 staff and 50–60% of output exported. Buyers receive a documented acceptance run and named test items, so an incoming inspection can reproduce the same numbers on their own floor.

FAQ

Which reducer types are covered? Parallel-shaft, helical, bevel and worm units, with limits set by the 1,500 N·m output ceiling and the 3,000 r/min input range.

What temperature limits are typically applied? For gear reducers, oil pool rise is commonly held below 35 °C and bearing rise below 40 °C; worm units allow roughly 60 °C and 50 °C respectively.

Can the bench run unattended? Long-duration durability cycles are automated, with alarm thresholds on temperature, vibration and torque deviation.

Full specification and configuration options: ISO 6336 Advanced Standard Reducer Dynamometer Test System