DODGERight Angle Worm Gear Reducer, 25:1 Ratio, 2.31 in Centre Distance, 140TC C-Face Input, Hollow Output Bore

Product Description

What this part is

A Dodge Tigear-2 right-angle worm gear speed reducer in the 2.31 in centre-distance frame, 25:1 nominal ratio, with a NEMA 140TC C-face motor input and a hollow output bore. The hollow output is the distinguishing feature: instead of driving through a shaft of its own, the reducer slides onto the driven machine shaft, which removes a coupling, a shaft alignment job and the space they occupy. This is the shaft-mount arrangement used on conveyor head shafts, augers, mixers and agitators.

Decoding the order code

23: 2.31 in centre distance, the gear case size and mounting footprint. A: C-face motor-mount input build. 25: 25:1 nominal reduction. H: hollow output bore rather than a solid output shaft. 14: NEMA 140TC motor flange.

What these specs mean in practice

A hollow-output box has no output shaft. The driven shaft is supplied by the machine, and a torque arm or foot mounting is required to stop the housing rotating with it.

25:1 runs genuinely slowly from a standard four-pole motor, roughly 70 rpm at the output from an 1800 rpm input, with the torque multiplication that goes with it. Higher-ratio worm sets are also less efficient and generate more heat on continuous duty.

A worm set can back-drive depending on ratio, lubricant and load, so this reducer is not a holding device.

The 140TC C-face input only accepts a 140TC motor. It is not a quill build and not a solid-input build.

Published specifications

Type: right-angle worm gear speed reducer, Dodge Tigear-2. Nominal ratio: 25:1. Centre distance: 2.31 in. Input: NEMA 140TC C-face motor flange. Output: hollow bore (shaft-mount). Shaft orientation: right angle (90°). Housing: cast iron. Lubrication: factory filled and sealed. UPC: 782475784301. Origin: United States.

Quantity and configuration

One reducer. No motor is included, and no torque arm or shaft hardware unless shown. The photographs show which parts ship with it. New old stock.

Mounting data

The unit mounts on the driven shaft through its hollow output bore and requires a torque arm or reaction foot. It is factory filled and sealed for a specified mounting position, and the correct oil level differs between mounting positions. A 25:1 worm set generates significant heat.

Interchange guidance

Solid-output builds in the 23 series (L and R codes) are the same reducer with an output shaft, a different mechanical arrangement rather than a substitute for a hollow-bore unit. Other 23-series ratios share the housing and mounting but change the output speed. 20, 26 and 30 series units are different centre distances, so related sizes rather than equivalents. Dodge Tigear-2 now ships under Regal Rexnord with unchanged numbering.