Mahle Starter Motor 24V 10T CW MS99

The MAHLE MS99 is a new 24V starter motor with clockwise rotation, 10 teeth on the pinion, and a 4.0kW power rating. It is listed as an insulated ground unit with reduction gear, and it uses a 3 hole starter mount. Those details matter when you are matching a starter to an existing application, because voltage, rotation, mounting pattern, and drive arrangement all need to align.

Key dimensions provided for this starter include 127mm mount centres A, 90mm mount centres B and C, a 89mm flange diameter, 11mm mounting hole diameter, and 320mm overall length. The pinion diameter is 39.5mm, pinion at rest is 29.5mm, and the flywheel depth is listed at 32.5. These measurements are the practical checkpoints that help confirm whether the starter will physically suit the vehicle or machine.

MAHLE lists this unit under part number MS99 and notes it as suitable for MAHLE applications. It is a dry clutch starter motor, supplied new, and covered by a one year warranty. For buyers replacing an existing starter, the part number and the mounting and drive measurements should be checked together before ordering.

Key Features

• 24V starter motor
• Clockwise rotation
• 10-tooth pinion
• 4.0kW power rating
• 3 hole starter mount
• Insulated ground with reduction gear

Specifications

• Brand: MAHLE
• Part No.: MS99
• Type: Starter motor
• Voltage: 24V
• Rotation: CW
• Number of teeth: 10
• Power rating: 4.0kW
• Starter mount type: 3 hole

Verified fitment applications

• ATLAS COPCO XAS375
• ATLAS COPCO XAS375 2016
• CATERPILLAR 312
• CATERPILLAR 312 2013
• CATERPILLAR 312E
• CATERPILLAR 312E 2014
• CATERPILLAR 313FL
• CATERPILLAR 313FL 2017

Application and Buying Notes

When replacing a starter motor, the safest way to confirm the match is to check the part number, the electrical system voltage, and the physical layout together. This unit is 24V, clockwise rotation, 10-tooth, and uses a 3 hole mount with 127mm mount centres A and 90mm mount centres B and C, so those points should be compared against the removed starter before purchase.

The reduction gear design and 4.0kW rating are important because they describe how the starter is built and the load it is intended to handle. The product is also listed with insulated ground, a 89mm flange diameter, 11mm mounting hole diameter, and 320mm overall length, all of which can affect whether the unit will sit correctly in the housing and align with the flywheel.

If you are working from a machine list, confirm the application as well as the measurements. Verified applications include ATLAS COPCO XAS375 and a range of CATERPILLAR models, but the correct approach is still to match the exact model and variant, then compare the starter dimensions, tooth count, rotation, and flywheel depth requirement against the original part.

This starter is supplied new and carries a one year warranty, which is useful information when planning a repair, but it does not replace fitment checking. On electrical and rotating components, the safest outcome comes from verifying the starter mount type, pinion dimensions, and rotation direction before the unit is fitted.

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 MS99 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 127mm, Mount Centres C 90mm, Number of Teeth 10, Pinion at Rest 29.5mm, Power Rating 4.0kW, Suits Unit Make Mahle, Note Insulated ground with reduction gear.

Additional published details for cross-checking include Starter Mount Type 3 Hole, Transmission Type with reduction gear, Number of mounting bores 3, For flywheel depth 32.5, Mounting points diameter 127.0, Packaging width 21.50, Net Weight 10439, Product Group 1 ROTATING ELECTRICAL, Part No. MS99, Brand MAHLE.

Mahle Starter Motor 24V 10Th CW. Part number MS99 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 MS99, 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 ATLAS COPCO XAS375, ATLAS COPCO XAS375 2016, CATERPILLAR 312, CATERPILLAR 312 2013, CATERPILLAR 312E, CATERPILLAR 312E 2014. 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.

The listed warranty is One Year. Warranty terms should be considered alongside correct application and part identification, as warranty does not replace fitment confirmation.

Compatibility note: Confirm compatibility by checking MAHLE part number MS99, 24V system requirement, clockwise rotation, 10-tooth pinion, 3 hole mount, and the listed mounting and drive dimensions against the original starter and vehicle or machine application.

FAQ

What is the part number for this starter motor?

The part number is MS99.

What voltage does this starter motor use?

It is a 24V starter motor.

Which way does it rotate?

It is listed as clockwise rotation, shown as CW.

How many teeth are on the pinion?

The pinion has 10 teeth.

What mounting style does it use?

It uses a 3 hole starter mount with 3 mounting bores.

Which applications are listed for this starter?

Verified applications include ATLAS COPCO XAS375 and several CATERPILLAR models, including 312, 312E, 313FL, 314, 314E, 315FL, 316EL, 316FL, 318, 318FL, 320FL, 320GC, 325FL, 420E, 420E-IT, 430E, 430E-IT, 430F, 432E, 432F, 450E and 914G.