DODGE23A25H14Right 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 (gear case size and mounting footprint)A — C-face motor-mount input build25 — 25:1 nominal reductionH — hollow output bore rather than a solid output shaft14 — NEMA 140TC motor flange

What these specs mean in practice

A hollow-output box has no output shaft. You supply the driven shaft, and you need a torque arm or foot mounting to stop the housing rotating with it — a hollow-bore reducer hung on a shaft with nothing holding the case will simply spin. Check what reaction hardware you have before ordering.

25:1 is a high enough ratio to run 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, so allow for heat on continuous duty.

Do not assume self-locking. A worm set can back-drive depending on ratio, lubricant and load; if a load must be held, fit a brake motor or a separate brake.

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-2Nominal ratio: 25:1Centre distance: 2.31 inInput: NEMA 140TC C-face motor flangeOutput: hollow bore (shaft-mount)Shaft orientation: right angle (90°)Housing: cast ironLubrication: factory filled and sealedUPC: 782475784301Origin: United States

Quantity and configuration

One reducer. No motor is included, and no torque arm or shaft hardware unless shown — see the photographs for exactly which parts ship with it. New old stock.

Installation and setup notes

Measure the hollow bore against your driven shaft and confirm the keyway before ordering. Fit and secure a torque arm or reaction foot before running. Check the oil level for the mounting position you intend to use, and run in under partial load before applying full torque — a 25:1 worm set generates real heat and wants a bedded-in gear face.

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, not 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.