Mechanical power transmission
Gearboxes & Speed Reducers replacement guide
Cross-reference worm, helical, bevel, shaft-mounted, planetary, cycloidal, precision, and heavy-duty gear reducers using ratio, torque, shafts, mounting, and configured options.
Evidence boundary. This cluster connects the broader parts library to the site's verified gearbox catalog. Exact replacements should remain tied to manufacturer/model evidence and dimensional verification.
Items covered01 · 14 component types
- Worm reducers
- Helical gearboxes
- Bevel gearboxes
- Hypoid gearboxes
- Planetary gearboxes
- Cycloidal reducers
- Shaft-mounted reducers
- Right-angle gearboxes
- Inline gearboxes
- Parallel-shaft reducers
- Servo gearboxes
- Heavy-duty gear drives
- Gearmotors
- Screw-conveyor reducers
What to capture02
Manufacturer, family, complete model, and ratioRecord this before searching for a substitute.
Input and output shaft or bore geometryRecord this before searching for a substitute.
Mounting style, center distance, footprint, and orientationRecord this before searching for a substitute.
Motor adapter, brake, backstop, and accessoriesRecord this before searching for a substitute.
Torque, service factor, duty, environment, and lubricationRecord this before searching for a substitute.
What must match03
Exact ratio and output speedConfirm it against the original equipment, duty, and source documentation.
Continuous and peak torque plus service factorConfirm it against the original equipment, duty, and source documentation.
Input and output mechanical interfacesConfirm it against the original equipment, duty, and source documentation.
Mounting geometry and shaft orientationConfirm it against the original equipment, duty, and source documentation.
Thermal rating, lubrication, backstop, and configured optionsConfirm it against the original equipment, duty, and source documentation.
Common searches04
What gearbox replaces this model?
What speed reducer is interchangeable with this unit?
How do I replace an obsolete gearbox?
Can a reducer with the same ratio replace mine?
Authoritative starting points05