5:1 planetary gearbox — torque and backlash limits
The GBX0800051403F is a straight-tooth planetary gearbox in the GBX series, 80 mm outer diameter, with a 5:1 reduction ratio. Continuous output torque is 110 N.m at 100 rpm and 30 °C; maximum intermittent torque reaches 176 N.m under the same conditions. Maximum torsional backlash is 9 arc.min — this is the angular play between input and output when reversing load direction. For positioning applications that require tighter repeatability, a lower-backlash variant (e.g., 3 arc.min) would be needed.
Efficiency, noise, and service life at rated load
Rated efficiency is 94 % — typical for a single-stage planetary with oil lubrication. Noise level at 1 m, no-load, is 60 dB, which is quiet enough for indoor conveyor or packaging lines without an enclosure. Service life is 30,000 hours at 100 rpm and 30 °C ambient. The gearbox is lubricated for life and sealed to IP54 at the shaft output — suitable for dry indoor environments but not washdown.
Sourcing an obsolete GBX gearbox
Available through independent surplus and broker channels. No pin-compatible drop-in replacement is documented, so a cross-reference to a current-series planetary (e.g., BSH or Lexium) would require checking the mounting flange, shaft diameter, and ratio.
Shaft loads and mounting constraints
Maximum axial force Fa is 1200 N at 100 rpm for a 10,000-hour life, dropping to 900 N for the full 30,000-hour rating. Maximum radial force Fr is 950 N (10,000 h) or 650 N (30,000 h), measured at mid-distance on the output shaft. The housing is black anodized aluminium; the output shaft is C45 steel.