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Brand: Dodge
Dodge Motorized Torque-Arm MTA Shaft-Mount Reducer
Description
Direct-drive shaft-mount reducer for continuous, high-shock duty
The Dodge Motorized Torque-Arm (MTA) is a right-angle, shaft-mounted, direct-drive reducer in the Torque-Arm family. Dodge invented the shaft-mounted reducer with the original Torque-Arm in 1949 and says more than three million Torque-Arm units are in service. MTA is offered in 10 sizes with several motor input options for drive packages up to 329,000 lb-in, and the brochure presents it as the rugged answer for continuous, high-shock applications. The motor attaches directly to the reducer, so the drive needs no base, belts, chains or alignment of separate components.
It is built in Dodge’s ISO 9001:2015 certified facility in Greenville, South Carolina, and every gearbox is spin and leak tested before shipment. Dodge describes the unit as assembled from stock components so that popular configurations are available off the shelf.
Technical specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Dodge Industrial, Inc., Simpsonville, South Carolina, USA (an RBC Bearings company) |
| Series | Motorized Torque-Arm (MTA) right-angle shaft-mount direct-drive reducer, part of the Torque-Arm family |
| Sizes | 10 sizes: MTA2115, 3203, 4207, 5215, 6307, 7315, 8407, 9415, 10507, 12608 |
| Torque | Drive packages up to 329,000 lb-in |
| Gearing | Case-carburized helical or helical-bevel gearing; input pinion straddle-mounted between bearings; AGMA design |
| Housing | Two-piece, doweled, precision machined class 30 gray iron |
| Bearings | Tapered roller; AGMA Class I, minimum 5,000 hour unadjusted L10 and 25,000 hour average life |
| Mounting | Patented twin-tapered bushings, standard-length or short-shaft; inch and metric bores |
| Seals | Patented harsh-duty HNBR oil seal with metal excluder and rubbing lip, -40 to 300 degF (-40 to 150 degC) |
| Backstop | Lift-off sprag design, compatible with extreme pressure (EP) lubricants |
| Inputs | Safety input adapter, enclosed input adapter, Atlas Adapter for foot-mounted motors |
| Manufacturer warranty (per catalogue, terms confirmed in quotation) | 18 months from installation or 36 months from manufacture |
| Condition monitoring | Sensor-ready housings for Dodge OPTIFY sensors and breathers |
Motor input options
| Input | Coupling | Motor frames | Availability |
|---|---|---|---|
| Enclosed input adapter | Three-piece jaw coupling | NEMA C-face 56 to 140T; IEC flange 90 to 250 | Sizes 2 to 12 |
| Safety input adapter | Sidewinder wrap coupling, removable cover for coupling access | NEMA C-face 180T to 405T | Sizes 2 to 12 |
| Atlas Adapter (patent pending) | For large foot-mounted motors | NEMA foot-mounted 364T to 447T | Sizes 7 to 12 |
Dodge states that flanged-motor assemblies support drive packages up to 100 hp (75 kW) and Atlas Adapter packages up to 200 hp (150 kW). For sizes 2 to 8 the tie rod should sit closest to the input end to reduce stress on the driven shaft; sizes 9 to 12 use a torque arm reaction beam. A tie rod kit for sizes up to 8, a heim-joint torque arm for the larger sizes, a motor-shaft fan on packaged assemblies with foot-mounted adapters, and an electric fan for sizes 7 to 12 are among the accessories.
Seals, backstop and drive options
The patented sealing system uses an HNBR oil seal protected by a metal excluder with a rubbing lip. Dodge states that HNBR lasts up to six times longer than standard NBR, covers -40 to 300 degF, and improves chemical and ozone resistance, which is why the catalogue names aggregates, mining, cement, asphalt, mixing and milling, and ethanol as target industries. The sprag backstop is the only one Dodge describes as designed for EP lubricants, and the catalogue notes MTA requires a larger backstop than an equivalent Torque-Arm II. A CEMA bolt-on screw conveyor adapter with double-lip seals and a three-hole alloy steel drive shaft is available, as are hydraulic drive assemblies, breather options including Hydra-Lock desiccant types, and reliability kits.
Ordering code and what to confirm
A model reads M for Motorized Torque-Arm, case size, H for heavy-duty, nominal ratio, T for tapered bore, motor frame and C for NEMA C-face or F for foot-mounted, for example M3H25T21C. C-face versions are listed for sizes 2 to 12, and foot-mounted adapter versions (F) for sizes 7 to 12. Confirm before ordering: shaft diameter and standard or short-shaft bushings, ratio and output speed, motor frame and enclosure, backstop direction, and the breather or reliability options needed for the environment.
Related Dodge products: Dodge Sidewinder Elastomeric Wrap Coupling, 5R-80R and Dodge StratoLink D71 API 610 Disc Coupling.
Documents and quotation
The attached PDF is the Dodge Motorized Torque-Arm brochure (BR2SD01-01.26). Related drives are listed under Couplings & Shaft Locking Devices, including the Torque-Arm II. Send the machine, shaft size, power, speed and ratio for a quotation.
Datasheets & Documents
- Brochure Dodge Motorized Torque-Arm brochure (BR2SD01-01.26) Download
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About brand
Dodge is an American brand of mounted bearings, gear reducers and couplings with roots in 1878, when Wallace Dodge began making wood products in Mishawaka, Indiana; the company became known for its wood split pulley and then power transmission products. Dodge passed to Reliance Electric in 1967, to Baldor in 2007 and to ABB in 2011, and became part of RBC Bearings in 2021. Its head office is in Simpsonville, South Carolina.
Seven Star LLC is an independent supplier in Muscat. We list Dodge bearings, reducers and couplings from official documents for mining, aggregate, cement and material handling users in Oman and the GCC.
Dodge company profile
| Founded | 1878, Mishawaka, Indiana, USA, by Wallace Dodge |
|---|---|
| Headquarters | Simpsonville, South Carolina |
| Ownership | RBC Bearings, since 2021 |
| Previous owners | Reliance Electric (1967), Baldor (2007), ABB (2011) |
| Product families | SC, SCM, SXR and 300-series mounted ball bearings, Maxum XTR concentric reducers, Torque-Arm II shaft-mount reducers, Sidewinder elastomeric couplings, StratoLink disc couplings |
Milestones
- 1878: Wallace Dodge starts the business in Mishawaka.
- 1967: Dodge is sold to Reliance Electric.
- 2007: Baldor acquires the Dodge and Reliance brands.
- 2011: ABB acquires Baldor.
- 2021: RBC Bearings acquires Dodge from ABB.
Dodge product series
Mounted bearings include the 300-Series ball bearing pillow blocks, set screw ball bearings in SC and SCM pillow blocks, eccentric collar ball bearings in SXR and SXV pillow blocks and the S-2000 mounted spherical roller bearing.
Gearing includes the Torque-Arm II shaft-mount reducer and the motorized Torque-Arm MTA, the Maxum XTR concentric reducer in sizes 50 to 130, the MagnaGear XTR reducer with torque up to 3,500,000 lb-in, the Quantis modular reducers and gearmotors and the Tigear-2 ventless worm gear reducer. Couplings include the Sidewinder elastomeric wrap coupling and the StratoLink D71 disc coupling for API 610 pumps.
Where Dodge products are used
Belt conveyors and bucket elevators, crushers and screens, fans and blowers, mixers and agitators, pumps and general material handling equipment.
Dodge products we list
Ordering Dodge products: what we need
Give the Dodge part number from the nameplate or bearing housing. Otherwise state the shaft diameter, housing type and locking method for bearings; the power, input speed, ratio and mounting for reducers; and the shaft sizes, torque and speed for couplings.
Facts checked against the Indiana state historical marker, Baldor's legacy page and RBC Bearings announcements, October 2026.
Browse Dodge products by category: Mounted Bearings & Housings, Gear Units & Reducers.
FAQ
Questions about the Dodge Motorized Torque-Arm MTA Shaft-Mount Reducer
Answers from our engineering team on installation, compatibility and integration.
01What is a Motorized Torque-Arm?
A right-angle shaft-mount direct-drive reducer in the Torque-Arm family, with the motor attached through an input adapter.
02How is it mounted?
On the driven shaft with a patented twin-tapered bushing system, restrained by a tie rod or torque arm.
03Which motor inputs are offered?
Enclosed or safety input adapters for flanged motors, and the Atlas Adapter for foot-mounted motors in sizes 7 to 12.
04What temperature range do the seals cover?
-40 to 300 degF (-40 to 150 degC).
05Is a backstop available?
Yes, a lift-off sprag backstop designed for use with EP lubricants.
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