STR 12V 7.3KW 11T 39MT Dual Earth Starter Motor - Part No. 70-HD123308

This STR starter motor is a 12V unit with a 7.3kW output, 11-tooth pinion, clockwise rotation, and 39MT series designation. It is identified with part number 70-HD123308 and is described as a dual earth style starter with insulated ground and an external housing index.

The main physical checks on this unit are the 56mm pinion diameter, 48mm pinion at rest, 92mm flange diameter, 127 x 127 x 127mm mount hole centre spacing, 17mm mount hole diameter, and 425mm overall length. The starter weighs 16.0kg and is oil sealed for wet clutch applications.

For a replacement starter, the key points to confirm are the 12V supply, 7.3kW output, 11T pinion, clockwise rotation, and 39MT mounting style. These details are the practical reference points when comparing the unit against the starter already fitted to the vehicle or machine.

Key Features

• 12V starter motor
• 7.3kW output rating
• 11-tooth pinion
• Clockwise rotation
• 39MT series
• Dual earth style

Specifications

• Part number: 70-HD123308
• Voltage: 12V
• Output: 7.3kW
• Pinion teeth: 11T
• Rotation: CW
• Pinion diameter: 56mm
• Pinion at rest: 48mm
• Flange diameter: 92mm

Application and Buying Notes

Before ordering, compare the part number 70-HD123308 with the starter already on the vehicle or equipment. On this unit, the most important identity checks are the 12V electrical system, 7.3kW rating, 11T pinion, clockwise rotation, and 39MT series designation. If any of those do not match, it is not the right unit to fit without further confirmation.

The mounting pattern is just as important as the electrical rating. This starter has a 127 x 127 x 127mm mount hole centre spacing, 17mm mount holes, a 92mm flange diameter, and a 425mm overall length. Those dimensions determine whether the starter will bolt up correctly and sit in the correct position for drive engagement.

The pinion details should also be checked carefully. A 56mm pinion diameter, 48mm pinion at rest, and 11-tooth drive pattern are specific measurements that help separate similar-looking starters from the correct replacement. A starter can look close in photos but still differ in a way that stops it from working properly.

Because no verified application list is supplied here, the safest approach is to match the removed starter against the listed measurements and identifiers before purchase. Workshop records, an existing part number, or direct comparison with the original unit are the most reliable ways to avoid a mismatch.

The published notes also show this as a dual earth, insulated ground unit with external housing index, oil sealed for wet clutch use, and a weight of 16.0kg. Those details are useful when checking whether the replacement is built for the same installation layout and service environment as the unit being removed.

In practical terms, the selection process should start with the part number, then the 12V rating, then the 7.3kW output, 11T pinion, CW rotation, and mounting measurements. That order helps reduce the chance of ordering a starter that is close in appearance but wrong in fitment or drive engagement.

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.

Relevant published details for this unit include Voltage 12V, Kilowatt 7.3kW, Number of Teeth 11T, Pinion Diameter 56mm, Rotation CW, Pinion at Rest 48mm, Flange Diameter 92mm, Mount Hole Center to Center 127 x 127 x 127mm, Mount Hole Diameter 17mm, Overall Length 425mm.

Additional published details for cross-checking include Oil Sealed WET CLUTCH, Series 39MT, Ground INSULATED, Housing Index EXTERNAL, Weight (Kg) 16.0kg, Specifications Part Number: 70-HD123308 Voltage, 12V Kilowatt, 7.3kW Number of Teeth, 11T Pinion Diameter, 56mm Rotation.

Listed voltage is 12V. These details form the core reference points used by parts interpreters when confirming the correct replacement.

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 12V should be checked carefully. Incorrect selection can affect installation time, return freight, and equipment availability.

Compatibility note: Confirm compatibility by matching part number 70-HD123308 and checking the listed 12V, 7.3kW, 11T, CW, 39MT, and mounting measurements against the existing starter and vehicle application details before ordering.

FAQ

What is the part number for this starter motor?

The listed part number is 70-HD123308. It should be matched against the original starter before ordering, along with the 12V rating and the mounting details. Listed voltage is 12V. These details should still be checked against the original unit before ordering.

What voltage is this starter motor?

It is a 12V starter motor. The 12V electrical system is one of the key checks for compatibility on this unit. Listed voltage is 12V. These details should still be checked against the original unit before ordering.

How many teeth does the pinion have?

The pinion is listed as 11T, meaning 11 teeth. That should be checked against the original starter and the drive engagement arrangement. Listed voltage is 12V. These details should still be checked against the original unit before ordering.

What is the rotation direction?

The starter is listed as clockwise rotation, or CW. Rotation direction is an important compatibility check when comparing starter motors. Listed voltage is 12V. These details should still be checked against the original unit before ordering.

Is this starter oil sealed?

Yes. It is listed as oil sealed for wet clutch applications. Listed voltage is 12V. These details should still be checked against the original unit before ordering.

What should I verify before buying?

Match part number 70-HD123308 and confirm the 12V rating, 7.3kW output, 11T pinion, CW rotation, 39MT series, and the listed mounting measurements against the existing starter and application details. Listed voltage is 12V. These details should still be checked against the original unit before ordering.