The GBX0800090842D is a planetary gearbox with a 9:1 reduction ratio, meaning the output shaft turns once for every nine input revolutions — a common ratio for servo axes that need torque multiplication without excessive speed reduction. Continuous output torque is 130 N.m, with a peak (maximum output torque) of 208 N.m — the continuous figure governs the duty cycle; the peak covers acceleration and emergency stops within the thermal budget. Efficiency is listed at 94 %, which is typical for a single-stage planetary with straight teeth — the 6 % loss goes into heat at the mesh, so the input power must be sized about 6 % above the output demand.
Backlash, rigidity, and service life — the precision side
Maximum torsional backlash is 17 arc.min — this is a standard-precision grade, not a zero-backlash unit. For positioning axes that reverse direction, the 17 arc.min shows up as lost motion at the load; if the application needs tighter repeatability, a lower-backlash series would be needed. Torsional rigidity is 6.5 N.m/arcmin — this tells you how much the gearbox winds up under load. At the continuous torque of 130 N.m, the wind-up is roughly 20 arcmin (130 ÷ 6.5), which adds to the backlash for the total positioning error. Service life is rated 30000 hours at 100 rpm output speed and 30 °C ambient — this is the L10 life under the continuous torque rating. The gearbox is lubricated for life, so no maintenance interval for oil changes.
Mounting, environment, and sourcing posture
The gearbox mounts in any position, with an 80 mm external diameter and black anodized aluminium housing. Shaft output protection is IP54 — suitable for indoor environments with dust and splash exposure, but not washdown or submersion.