Prestolite Starter Motor 24V 11 Tooth CW M128739C

The Prestolite M128739C starter motor is a new 24V unit with 11 teeth and clockwise rotation, supplied as a 3 hole starter motor with an insulated return. It is listed with a 12kW power rating, 440mm overall length, and a 17kg weight, so it is a substantial heavy-duty rotating electrical component rather than a light universal replacement.

This starter is noted as suitable for Caterpillar applications and uses an SAE1 special mount. The mounting dimensions recorded are 146mm mount centres A, 103mm mount centres C, 103mm mount centres B, a 16.5mm mount hole diameter, and a 92mm flange diameter. Those dimensions matter when checking the starter nose, mounting pattern, and housing clearance before ordering.

The unit is a Prestolite-branded starter motor with part number M128739C and OEM number M128R3821SE. It is described as having more torque and increased dependability, a rotatable nose, and insulation, which are practical features to confirm against the vehicle or machine application rather than relying on a general starter motor match.

Key Features

• 24V starter motor
• 11-tooth pinion
• Clockwise rotation
• Rotatable nose
• Insulated return
• New unit

Specifications

• Brand: Prestolite
• Part No.: M128739C
• OEM Number: M128R3821SE
• Product Type: Starter Motor
• Voltage: 24V
• Power Rating: 12kW
• Rotation: CW
• Number of Teeth: 11

Fitment guidance

• Listed suitability includes Caterpillar applications.
• Fitment information also references TEREX O&K RH340B, RH340BH, and RH340FS applications.
• Grouped fitment previews include TEREX O&K RH340B 2001, RH340BH 2006, RH340BH 2007, RH340BH 2008, and RH340FS 2008.

Application and Buying Notes

Before buying, check the part number M128739C and OEM number M128R3821SE against the starter already fitted to the machine. The recorded 24V voltage, 12kW power rating, 11-tooth pinion, and clockwise rotation must all align with the existing application, because starter motors with similar housings can still differ in direction, tooth count, or electrical specification.

Mounting details are just as important as the electrical side. This unit is listed with an SAE1 special mount, 3 hole starter mount, 146mm mount centres A, 103mm mount centres B and C, a 16.5mm mount hole diameter, and a 92mm flange diameter. Those measurements should be matched against the current starter and mounting face so the nose housing and bolt pattern line up correctly.

Because this is a 17kg new starter motor with insulated return and a rotatable nose, it is intended for heavy-duty applications where access and clearance matter. Confirm the overall length of 440mm and pinion at rest measurement of 46mm if there is limited space around the bellhousing, mount, or adjacent components.

The warranty listed is one year, so keep purchase and installation records together with the part number details. If the existing unit is worn or unreadable, compare the mounting pattern, tooth count, rotation, flange diameter, and the OEM number M128R3821SE before committing to the order.

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 M128739C 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, Unit of Measure EACH, Warranty One Year, Mount Centres A 146mm, Mount Centres C 103mm, Number of Teeth 11, Pinion at Rest 46mm, Power Rating 12kW, Suits Unit Make Prestolite, Note TO SUIT CATERPILLAR. SAE1 Special mount 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..

Additional published details for cross-checking include New / Reman. New, Wet / Dry Clutch Wet or Dry, OEM Number M128R3821SE, Product Group 2 STARTER MOTORS, Part No. M128739C, Brand PRESTOLITE, Description Prestolite Starter Motor 24V 11Th CW, Flange Diameter 92mm, Mount Centres B 103mm.

Prestolite Starter Motor 24V 11Th CW. Part number M128739C 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 M128739C, 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 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.

Available application references include TEREX O&K RH340B, TEREX O&K RH340B 2001, TEREX O&K RH340BH, TEREX O&K RH340BH 2006. Even with application listings, final confirmation should still be based on the exact unit being replaced and the service requirements of the vehicle or machine.

Compatibility note: Please confirm fitment by matching the part number M128739C, OEM number M128R3821SE, 24V voltage, 11-tooth clockwise specification, and the listed mounting measurements against the existing starter and machine application before purchase.

FAQ

What is the part number for this starter motor?

The part number is M128739C. The OEM number listed is M128R3821SE. For this listing, part number M128739C is the main reference point. Listed voltage is 24. Published fitment references include TEREX O&K RH340B, TEREX O&K RH340B 2001, TEREX O&K RH340BH. These details should still be checked against the original unit before ordering.

Is this a 24 volt starter?

Yes. The listed voltage is 24V. For this listing, part number M128739C is the main reference point. Listed voltage is 24. Published fitment references include TEREX O&K RH340B, TEREX O&K RH340B 2001, TEREX O&K RH340BH. These details should still be checked against the original unit before ordering.

How many teeth does the pinion have?

It has 11 teeth. For this listing, part number M128739C is the main reference point. Listed voltage is 24. Published fitment references include TEREX O&K RH340B, TEREX O&K RH340B 2001, TEREX O&K RH340BH. These details should still be checked against the original unit before ordering.

What rotation does this starter motor use?

The rotation is clockwise, shown as CW. For this listing, part number M128739C is the main reference point. Listed voltage is 24. Published fitment references include TEREX O&K RH340B, TEREX O&K RH340B 2001, TEREX O&K RH340BH. These details should still be checked against the original unit before ordering.

What mounting style is listed?

It is listed as a 3 hole starter mount with an SAE1 special mount note. For this listing, part number M128739C is the main reference point. Listed voltage is 24. Published fitment references include TEREX O&K RH340B, TEREX O&K RH340B 2001, TEREX O&K RH340BH. These details should still be checked against the original unit before ordering.

What warranty is supplied?

The warranty listed is one year. For this listing, part number M128739C is the main reference point. Listed voltage is 24. Published fitment references include TEREX O&K RH340B, TEREX O&K RH340B 2001, TEREX O&K RH340BH. These details should still be checked against the original unit before ordering.