OEX Alternator 12V 55A Denso Style DXA4057

The OEX Alternator 12V 55A Denso Style is a new rotating electrical unit for 12V systems, rated at 55 amps and supplied as each. It carries part number DXA4057 and is designed with an internal regulator, a single leg alternator mount, and a pulley outside diameter of 63mm with an A section pulley.

This unit suits Denso applications and is listed with mount leg thickness of 24mm, pivot hole diameter of 10mm, mount centre to centre of 154mm, and adjusting hole thread M8 x 1.25. Those measurements are important when comparing the alternator to the original unit, especially where bracket spacing and mount style must match closely.

OEX states its products are sourced from market leading original equipment manufacturers and aftermarket suppliers, with production from ISO certified factories. The alternator is backed by a 3 year passenger / 1 year commercial warranty, which is a useful buying point for owners who want a replacement unit with clear coverage terms.

Key Features

• 12V alternator with 55A output
• New unit, supplied each
• Internal regulator
• Single leg alternator mount
• Denso style, suits Denso unit applications
• 63mm pulley outside diameter

Specifications

• Part number: DXA4057
• Brand: OEX
• Product type: Alternator
• Voltage: 12V
• Power rating: 55A
• Regulator type: Internal
• Suits unit make: Denso
• Alternator mount: Single leg

Compatible applications listed

• AIRMAN PDS100S
• AIRMAN PDS100S 2018
• CASE CX31B
• CASE CX36B
• CASE CX50B
• CASE CX50B 2007
• CASE CX50B 2008
• CASE CX50B 2009

Application and Buying Notes

Before ordering, compare the part number DXA4057 and the physical mounting details with the alternator already fitted to the machine. The key points here are the single leg mount, 154mm mount centre to centre, 24mm mount leg thickness, 10mm pivot hole diameter, and M8 x 1.25 adjusting hole, as these features need to align with the bracket set-up on the vehicle or machine.

The alternator is a 12V, 55A unit with an internal regulator and a 63mm A section pulley. That combination matters because output capacity, pulley size, and regulator type all need to suit the electrical system and drive arrangement already in place. A mismatch can mean the unit will not mount correctly or may not operate as intended.

This listing includes a broad application list across compact equipment and small tractors, but the safest approach is still to verify against the exact model, year if known, and the original alternator dimensions. Where the original unit is unavailable, matching the mounting dimensions, pulley section, and unit make as closely as possible is the best way to reduce the risk of ordering the wrong part.

The alternator is supplied new and weighs 3.18kg. If you are replacing a worn or noisy unit, it is sensible to inspect the belt condition, pulley alignment, and charging system connections at the same time, because a new alternator will still rely on the existing belt drive, wiring, and mounting hardware being in sound condition.

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 DXA4057 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 3yr Passenger 1yr Commercial, Mount Leg Thickness 24mm, Pivot Hole Diameter 10, Pulley Outside Diameter 63mm, Regulator Type Internal, Voltage 12, Mount Cnt to Cnt 154mm, Weight 3.18kg.

Additional published details for cross-checking include Product Group 1 ROTATING ELECTRICAL, Part No. DXA4057, Brand OEX, Description OEX Alternator 12V 55A Denso Style, Adjusting Hole Diameter M8 x 1.25, Pin Code IR74, Power Rating (Amp) 55, Pulley Section A, Suits Unit Make Denso, Alternator Mount Single Leg.

OEX Alternator 12V 55A Denso Style. Part number DXA4057 should be checked first. Listed voltage is 12. Listed output rating is 55. 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 A. Those physical and electrical details should line up with the original unit before the replacement is approved for fitment.

For part number DXA4057, 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 55 should be checked carefully. Incorrect selection can affect installation time, return freight, and equipment availability.

Available application references include AIRMAN PDS100S, AIRMAN PDS100S 2018, CASE CX31B, CASE CX36B, CASE CX50B, CASE CX50B 2007. 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 3yr Passenger 1yr Commercial. Warranty terms should be considered alongside correct application and part identification, as warranty does not replace fitment confirmation.

Compatibility note: Confirm fitment by checking part number DXA4057, the Denso style application, and all mounting and pulley measurements against the original alternator before purchase.

FAQ

Is this alternator new or remanufactured?

This is listed as new, not remanufactured.

What is the output rating?

The alternator is rated at 55A and is for 12V systems.

Does it have an internal regulator?

Yes. The regulator type is listed as internal.

What mounting details should I check before buying?

Check the single leg mount, 154mm mount centre to centre, 24mm mount leg thickness, 10mm pivot hole diameter, and M8 x 1.25 adjusting hole.

What pulley details are listed?

The pulley outside diameter is 63mm and the pulley section is A.

What warranty is supplied?

The warranty is 3 years for passenger use and 1 year for commercial use.