Mahle Starter Motor 12V 9 Tooth CW MS645

The Mahle starter motor MS645 is a new 12V unit with 9 teeth and clockwise rotation. It is listed as an Original Equipment part and is supplied as a starter motor for applications that match the stated mounting and drive dimensions.

Key identifiers for this unit include part number MS645, OEM number 11132121, a 3.2kW power rating, and a reduction gear transmission type. The starter uses a 2 hole mount layout with 2 mounting bores, so matching the physical pattern is just as important as matching the electrical specification.

Dimension checks matter with starter motors, and this unit lists an overall length of 270mm, a 34mm pinion diameter, a 89mm flange diameter, and a mount hole diameter of 11mm. Those figures help narrow the match before you compare it against the existing starter on the machine.

If you are replacing a starter on equipment that uses the Mahle MS645 specification, the rotation, tooth count, flywheel depth, and mount centre spacing are all worth confirming before purchase. The listed flywheel depth is 29.7, and the mount centre to centre measurement is 127mm.

Key Features

• Original Equipment part.
• New starter motor.
• 12V electrical system.
• 9 tooth pinion.
• Clockwise rotation.
• 3.2kW power rating.

Specifications

• Part number: MS645.
• OEM number: 11132121.
• Brand: Mahle.
• Voltage: 12V.
• Rotation: CW.
• Number of teeth: 9.
• Power rating: 3.2kW.
• Overall length: 270mm.

Verified application references

• AMMANN ARP95/K.
• AMMANN ARS110.
• AMMANN ARS130.
• AMMANN ART240.
• AMMANN ART280.
• AMMANN ARX110/C/K.
• AMMANN ARX90/C/K.
• CATERPILLAR TH314D.

Application and Buying Notes

Before ordering, compare the existing starter against the listed part number MS645 and OEM number 11132121. Matching the part identifier is the safest starting point, then confirm the physical details such as 12V voltage, clockwise rotation, 9 teeth, and the 2 hole mount pattern.

The mounting dimensions are important on this starter. Check the 127mm mount centre to centre measurement, the 11mm mount hole diameter, the 89mm flange diameter, and the 270mm overall length against the unit being replaced. Even small differences in these areas can prevent installation.

The drive-side figures should also be checked carefully. This starter lists a 34mm pinion diameter, 26.5mm pinion at rest, tooth pitch of 14.4, and flywheel depth of 29.7. These are useful comparison points when confirming that the starter aligns correctly with the flywheel and bellhousing arrangement.

Because the application list covers a wide range of machinery, it is best to treat the fitment references as a guide rather than a blanket guarantee. Compare the machine make, model, and year where available, then confirm the starter details on the machine or with the existing unit before fitting.

This is a new starter motor and it carries a one year warranty. As with any electrical replacement, make sure the battery, cables, earth points, and mounting faces are in good condition, because poor connections or worn mounting surfaces can affect starting performance regardless of the starter specification.

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 MS645 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 Hole Diameter 11, Overall Length 270mm, Pinion Diameter 34mm, Rotation CW, Voltage 12, Mount Cnt to Cnt 127mm, Starter Mount Type 2 Hole.

Additional published details for cross-checking include Transmission Type with reduction gear, Number of mounting bores 2, For flywheel depth 29.7, Packaging length 38.2, Packaging height 14.50, Product Group 2 STARTER MOTORS, Part No. MS645, Brand MAHLE, Description Mahle Starter Motor 12V 9Th CW.

Mahle Starter Motor 12V 9Th CW. Part number MS645 should be checked first. Listed voltage is 12. These details form the core reference points used by parts interpreters when confirming the correct replacement.

For part number MS645, 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 12 should be checked carefully. Incorrect selection can affect installation time, return freight, and equipment availability.

Compatibility note: Please confirm fitment by matching part number MS645, OEM number 11132121, and the full application details against your existing starter and machine specifications before ordering.

FAQ

Is this starter motor new or remanufactured?

It is listed as new. For this listing, part number MS645 is the main reference point. Listed voltage is 12. Published fitment references include AMMANN ARP95/K, AMMANN ARP95/K 2015, AMMANN ARS110. These details should still be checked against the original unit before ordering.

What voltage is this starter motor?

It is a 12V starter motor. For this listing, part number MS645 is the main reference point. Listed voltage is 12. Published fitment references include AMMANN ARP95/K, AMMANN ARP95/K 2015, AMMANN ARS110. These details should still be checked against the original unit before ordering.

What is the rotation direction?

The rotation is clockwise (CW). For this listing, part number MS645 is the main reference point. Listed voltage is 12. Published fitment references include AMMANN ARP95/K, AMMANN ARP95/K 2015, AMMANN ARS110. These details should still be checked against the original unit before ordering.

How many teeth does the pinion have?

It has 9 teeth. For this listing, part number MS645 is the main reference point. Listed voltage is 12. Published fitment references include AMMANN ARP95/K, AMMANN ARP95/K 2015, AMMANN ARS110. These details should still be checked against the original unit before ordering.

What are the main mounting details?

It uses a 2 hole starter mount, with 2 mounting bores, 127mm mount centre to centre, and an 11mm mount hole diameter. For this listing, part number MS645 is the main reference point. Listed voltage is 12. Published fitment references include AMMANN ARP95/K, AMMANN ARP95/K 2015, AMMANN ARS110. These details should still be checked against the original unit before ordering.

What warranty is listed?

The listed warranty is one year. For this listing, part number MS645 is the main reference point. Listed voltage is 12. Published fitment references include AMMANN ARP95/K, AMMANN ARP95/K 2015, AMMANN ARS110. These details should still be checked against the original unit before ordering.