OEX Starter Motor 24V 11T CW M128739X

The OEX Starter Motor 24V 11T CW is a heavy commercial starter motor with part number M128739X. It is a new unit, rated at 12kW, with 24V operation, clockwise rotation and 11 teeth on the pinion, making the key identifiers easy to check before ordering.

This starter is listed as suitable for Prestolite applications and is described as part of the M128 Series, PLGR, heavy duty range. It uses a 3 hole starter mount, has a 92mm flange diameter, 126mm mount centres, and a 17mm mount hole diameter, so physical match-up matters as much as voltage and tooth count.

The unit is built as an insulated return starter with wet or dry clutch suitability, and it weighs 15.3kg. The overall length is 376mm and the pinion diameter is 56mm, so installation space and engagement dimensions should be confirmed against the original starter before purchase.

Key Features

• 24V heavy commercial starter motor
• 11 tooth pinion with clockwise rotation
• 12kW power rating
• New unit with one year warranty
• Suits Prestolite applications
• Insulated return design

Specifications

• Brand: OEX
• Part No.: M128739X
• Voltage: 24V
• Power Rating: 12kW
• Rotation: CW
• Number of Teeth: 11
• Starter Mount Type: 3 hole
• Flange Diameter: 92mm

Application and Buying Notes

For a starter motor like this, the most important checks are the part number M128739X, the 24V system requirement, and the physical dimensions. This unit is a 3 hole starter with 126mm mount centres, a 92mm flange diameter and a 17mm mount hole diameter, so it is best compared directly with the original starter before fitting.

The 11 tooth pinion, 56mm pinion diameter and 48mm pinion at rest are also important when confirming compatibility. If the tooth count, pinion size or rotation do not match the existing starter, the unit may not engage correctly, even if the bolt pattern looks close.

This starter is specified as suitable for Prestolite and described as M128 Series, PLGR, heavy duty, with a note that for dual applications you must not mix M128 with M125, MS7 or 50MT starters. In those cases, two M128 starters must be used, so checking the full application details matters before ordering.

The note also states that flange or IMS relay may require rotation, and that it is SAE3 mount insulated with mine specs. If the vehicle or machine has those features, confirm the installation orientation and mounting arrangement against the existing part, not just the listed voltage or power rating.

Because this is a 12kW heavy commercial starter weighing 15.3kg, it is intended for robust rotating electrical applications rather than a light-duty universal replacement. Confirm the original unit’s output, return type and mounting style so the replacement matches both the electrical requirement and the physical installation.

The one year warranty applies to the new OEX unit, but warranty coverage does not replace the need to verify fitment. A correct match should be based on the original part number, the Prestolite application details, and the physical measurements listed here.

Before supply, the safest approach is to confirm the original unit details against the listed part number, voltage, output rating, mounting arrangement, and pulley configuration. That checking process is standard practice in the parts trade because visually similar units can still differ in service-critical ways.

For workshop, fleet, and equipment applications, accurate identification of part number M128739X helps avoid unnecessary freight, additional labour, and vehicle or machine downtime. Where the application is not straightforward, the original unit, OEM reference, or workshop records should be used as the primary confirmation point.

Relevant published details for this unit include Type STARTER MOTOR HEAVY COMM, Unit of Measure EACH, Warranty One Year, Mount Centres A 126mm, Mount Centres C 126mm, Number of Teeth 11, Pinion at Rest 48mm, Power Rating 12kW, Suits Unit Make Prestolite, Note M128 Series, PLGR, Heavy Duty For dual applications do not mix M128 with M125, MS7 or 50MT starters. You must use 2x M128 starters. Flange or IMS relay may require rotation. SAE3 Mount Insulated. Mine Specs..

Additional published details for cross-checking include New / Reman. New, Wet / Dry Clutch Wet or Dry, Weight 15.3kg, Product Group 1 ROTATING ELECTRICAL, Part No. M128739X, Brand OEX, Description OEX Starter Motor 24V 11Th CW, Flange Diameter 92mm, Mount Centres B 126mm, Mount Hole Diameter 17.

OEX Starter Motor 24V 11Th CW. Part number M128739X should be checked first. Listed voltage is 24. These details form the core reference points used by parts interpreters when confirming the correct replacement.

For part number M128739X, the normal identification sequence is part number, electrical rating, mounting arrangement, connector or terminal style, and pulley or drive details. Using those checkpoints helps confirm that the listed unit matches the service requirement rather than only looking similar.

For a starter motor heavy comm in workshop, fleet, trade, agricultural, or construction service, the listed voltage 24 should be checked carefully. Incorrect selection can affect installation time, return freight, and equipment availability.

Where no verified application list is available, the part number, mounting details, connector style, and published specifications should be used as the primary selection criteria.

In the absence of a verified fitment list, the safest approach is to compare the removed unit directly with the listed product details. That includes checking the housing style, pulley layout, regulator arrangement, and any visible identification numbers before supply is approved.

Compatibility note: Please confirm fitment using part number M128739X, the 24V 11 tooth CW configuration, and the listed mounting and dimensional details before ordering.

FAQ

Is this starter motor new or remanufactured?

It is listed as new, not remanufactured.

What is the part number?

The part number is M128739X.

What voltage does this starter use?

It is a 24V starter motor.

How many teeth does the pinion have?

The pinion has 11 teeth.

What rotation does it have?

It is clockwise rotation, listed as CW.

What should I check to confirm it will fit?

Check the part number M128739X, the 24V rating, 11 tooth pinion, 3 hole mount, 126mm mount centres, 92mm flange diameter, 17mm mount hole diameter, and the Prestolite application details against the original unit.