The GBX0801000703F is a straight-tooth planetary gearbox with a 100:1 reduction ratio, 80 mm housing diameter, and black anodized aluminium body. The 100:1 ratio means the output shaft turns once for every 100 input revolutions — typical for indexing tables, conveyor drives, or positioning axes where high torque multiplication is needed at low output speed. Continuous output torque is 120 N.m at 100 rpm and 30 °C; maximum intermittent torque reaches 192 N.m under the same conditions. The 94 % efficiency means about 6 % of input power is lost as heat through the gear mesh — a factor when sizing the upstream motor and checking thermal rise in a sealed enclosure. Torsional backlash is 16 arcmin — that is the angular play between input and output when reversing direction. For positioning applications, this sets the repeatability floor: a load reversing through the gear train will see up to 16 arcmin of lost motion before the output responds. If the application needs tighter positioning, a lower-backlash gearbox (e.g. 3–5 arcmin) would be required.
Sourcing an obsolete planetary gearbox — lifecycle reality and supply posture
Schneider Electric lists the GBX0801000703F as obsolete. No official successor or cross-reference part number is recorded. This means the original manufacturer no longer produces it, and the only supply channel is independent surplus or broker inventory. The gearbox carries a 30000-hour service life at 100 rpm and 30 °C, lubricated for life — no field regreasing interval. When sourcing a replacement for a line-down situation, confirm the remaining service life of the unit being replaced against the new-old-stock unit's production date; shelf-aged lubricant may reduce effective life. Available through independent distribution against an RFQ. Quantities are lot-specific — no blanket stock commitment. The IP54 shaft output rating means the gearbox is protected against dust ingress and splashing water at the shaft seal, but not washdown or submersion; if the original installation was in a wet environment, verify the seal condition on any surplus unit before commissioning.
Mechanical interface and load limits for field fit
Output shaft is C45 steel. Maximum radial force (Fr) at mid-span on the output shaft is 650 N for 30000-hour life, 950 N for 10000-hour life — both at 100 rpm and 30 °C. Maximum axial force (Fa) is 1200 N for 10000-hour life, dropping to 900 N for 30000-hour life. These limits govern belt-pulley or chain-sprocket loads directly on the output shaft; exceeding them shortens bearing life faster than the gear mesh wears. The torsional rigidity is 6.3 N.m/arcmin — a measure of how much the gear train winds up under load. For a servo-driven axis, this stiffness combines with the motor's torsional resonance to set the gain ceiling in the servo loop. Noise level is 60 dB at 1 m, no-load — roughly the sound of a quiet office. Under load, expect a few dB higher from gear mesh harmonics. The straight-tooth design is inherently noisier than helical; if the application is in a noise-sensitive area (e.g. near operator stations), a helical planetary would be quieter.