Mahle Alternator 12V 95A MG251

The Mahle MG251 is a new 12V alternator rated at 95A, supplied as each unit and fitted with an internal regulator. It is listed with a single-leg alternator mount, a B-section pulley, and a belt pulley already included, which makes the core installation details clear before you compare it to the unit being replaced.

Key mounting dimensions for this alternator include a 56mm mount leg thickness, 173mm mount centre-to-centre measurement, 56.0mm mounting bore distance, 8mm adjusting hole diameter, and 8.2mm pivot hole diameter. The pulley outside diameter is 92mm, and the distance from the pulley to the alternator is 27.0mm.

This is a dust proof alternator from Mahle, part number MG251, and it carries a one year warranty. The unit is described as new rather than remanufactured, so the important comparison points are voltage, output, mounting style, pulley arrangement, and the listed dimensions rather than assuming a universal replacement.

Mahle also notes that the alternators fulfil international standards and requirements for electromagnetic compatibility and are manufactured using environmentally friendly technologies and materials. That is useful background, but the practical fit check still comes down to the physical mounting and application details for the machine or vehicle you are working on.

Key Features

• 12V alternator with 95A output
• Internal regulator
• New unit, not remanufactured
• Single-leg alternator mount
• Supplied with belt pulley
• Dust proof design

Specifications

• Brand: Mahle
• Product type: Alternator
• Voltage: 12V
• Charge current: 95A
• Power rating: 95A
• Part number: MG251
• Alternator mount: Single leg
• Pulley section: B

Known application references

• Chamberlain: 306, 3380, 3380B, 4080, 4090, 4090 1986, 4280, 4280B, 4290, 4290 1986, 4480, 4480B
• Dynapac: CA141D/PD, CA141D/PD 1998, CA141D/PD 1999
• John Deere: 1040 1986, 1040 1987, 1500 Series, 1750 1987 to 1995
• John Deere fitment references also include 2054, 2100, 2300, 2400, 3.164D, 300B, 3029D, 355D, 4.219T, 4.239T, 410G, 4425, 444D, 450J, 455G, 624G, 624G H, 640G III, 644G, 644G H, 6600, 6605, 70, 70D, 710G, 740E, 7440 Series, 748G III, 7500, 7720, 850D, 8820, 8875, 9910, JD310, Series 2050, Series 3000, Series 6000, Series 6010

Application and Buying Notes

Before ordering, match the MG251 part number, the 12V system voltage, and the 95A charge current against the alternator you are replacing. Those three details are the first checkpoint, because a 12V 95A unit with an internal regulator is not interchangeable with every alternator that looks similar in the mounting bracket.

Physical fit matters just as much as electrical output. Compare the single-leg mount, the 56mm mount leg thickness, the 173mm mount centre-to-centre measurement, and the 56.0mm mounting bores distance with the old unit. Also check the 8mm adjusting hole and 8.2mm pivot hole, as these dimensions affect whether the alternator will line up correctly in the bracket.

The pulley setup should also be verified carefully. This alternator is listed with a B-section pulley, one belt position, and a 92mm pulley outside diameter. If the belt profile, pulley offset, or belt alignment differ from the unit being removed, the alternator may not suit the application even if the mounting points appear close.

Fitment references are provided for Chamberlain, Dynapac, and a range of John Deere applications, but those references should be treated as a guide only. Always compare the part number and the measured dimensions on the vehicle or machine, especially when the application has had previous repairs, non-original parts fitted, or a bracket or belt change.

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 MG251 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 ALTERNATOR, Unit of Measure EACH, Warranty One Year, Mount Leg Thickness 56mm, Power Rating (Amp) 95, Pulley Section B, Suits Unit Make Mahle, Note Dust proof, Mount Cnt to Cnt 173mm, Alternator Charge Current [A] 95.

Additional published details for cross-checking include Mounting Bores Distance 56.0, Number of belts 1, Packaging length 20.8, Packaging height 15.50, Product Group 2 ALTERNATORS, Part No. MG251, Brand MAHLE, Description Mahle Alternator 12V 95A, Adjusting Hole Diameter 8.

Mahle Alternator 12V 95A. Part number MG251 should be checked first. Listed voltage is 12. Listed output rating is 95. These details form the core reference points used by parts interpreters when confirming the correct replacement.

Mount style is Single Leg. Regulator type is Internal. Pulley configuration is B. Those physical and electrical details should line up with the original unit before the replacement is approved for fitment.

For part number MG251, 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 alternator in workshop, fleet, trade, agricultural, or construction service, the listed voltage 12 and output 95 should be checked carefully. Incorrect selection can affect installation time, return freight, and equipment availability.

Compatibility note: Confirm fitment using the Mahle MG251 part number, the 12V 95A rating, the single-leg mount, and the listed mounting and pulley dimensions before purchase.

FAQ

What is the part number for this alternator?

The listed part number is MG251.

Is this alternator new or remanufactured?

It is listed as new.

What voltage and output does it have?

It is a 12V alternator with a 95A charge current and 95A power rating.

Does it have an internal regulator?

Yes. The regulator type is listed as internal.

What pulley details are listed?

It is supplied with a belt pulley, has a B-section pulley, a single belt position, and a 92mm pulley outside diameter.

What should I check before ordering?

Check the MG251 part number, the 12V 95A specification, the single-leg mount, and the listed mounting dimensions including 56mm mount leg thickness and 173mm mount centre-to-centre.