OEX Alternator 12V 45A Denso Style DXA4040

The OEX Alternator DXA4040 is a new 12V, 45A unit built in a Denso style configuration for rotating electrical applications. It is listed with a single leg alternator mount, internal regulator, A section pulley, and a 74mm pulley outside diameter, so the key matching points are not just voltage and amperage but also the physical mounting and pulley details.

This alternator is identified with part number DXA4040 and pin code IR74. The listed mounting dimensions include 24mm mount leg thickness, 10mm pivot hole diameter, M8x1.25 adjusting hole diameter, and 138mm mount centre to centre. Those measurements are the sort of details that matter when replacing a unit on a machine that already has a Denso-style alternator fitted.

OEX states that its products are sourced from original equipment manufacturers and aftermarket suppliers, with factories that are ISO9001 certified. The unit is covered by a 3 year passenger / 1 year commercial warranty, and the alternator weight is listed at 3.7kg. For buyers comparing replacements, those details help confirm that the correct physical and electrical unit is being selected before installation.

Key Features

• 12V, 45A alternator
• New unit
• Denso style
• Internal regulator
• Single leg alternator mount
• A section pulley

Specifications

• Brand: OEX
• Product type: Alternator
• Voltage: 12V
• Power rating: 45A
• Unit of measure: Each
• Suits unit make: Denso
• Alternator mount: Single leg
• Regulator type: Internal

Fitment guidance

• Listed fitment support includes equipment from Active, Airman, Ammann, ASV, Bobcat, Case, Caterpillar, Cub Cadet, Daihatsu, Dynapac, Eurocomach, Hitachi, IHI, JCB, John Deere, Kobelco, Komatsu and Kubota.
• Sample applications listed include Bobcat 322, 323, 324, 325, 328, 329, 418, 425, 428, 463, B200 and E08.
• Other sample applications listed include Case 1825B, CX75SR and CX80; Caterpillar 300.9D, 304C, 304CCR, 305.5DCR, 305C, 305CCR, 305DCR and 904B; and Kubota B21, B26, BX22, BX23LB, BX25 and several D-series engines.
• Hitachi sample applications listed include EX12, EX15, EX25-2, EX30-2, EX35-2, LX15, LX20, LX30, LX40, ZW40, ZW50 and ZX10U-2.
• John Deere sample applications listed include 15, 17D, 3029D, 317, 35 ZTS, 35C ZTS, 425, 445, 455, 50 ZTS, 50C ZTS and 5310N.
• Komatsu sample applications listed include FG10, FG10-10, FG14, FG14-10, FG15/10, FG15DT-15, FG18D, L-15, PC30MR-2, PC30MRX, PC35R-8 and SK05J-2.

Application and Buying Notes

Before ordering, compare the part number DXA4040, the Denso-style form, and the physical mounting details against the unit being replaced. The listed measurements of 24mm mount leg thickness, 10mm pivot hole diameter, M8x1.25 adjusting hole diameter, and 138mm mount centre to centre are practical checkpoints because alternators that look similar can still differ in the way they bolt up.

The electrical rating is 12V at 45A, so it is important to match the system voltage and ensure the output is appropriate for the machine. The alternator also uses an internal regulator, which should be checked against the existing setup, since regulator type can affect whether the replacement is suitable without extra changes.

The pulley details matter as well. This unit has a 74mm outside diameter pulley with an A section belt profile, so the belt and drive arrangement should be checked carefully before purchase. The shaft dimension is listed as 17, and the pin code is IR74, which are useful identifiers when confirming the correct style against a removed sample or the existing alternator.

This alternator is listed as suitable for Denso applications, but fitment should still be confirmed against the specific machine model, engine, or installed alternator part number. The supplied fitment support covers a wide range of compact equipment and machinery, so matching by application alone is not enough if the existing unit differs in mounting, pulley or regulator arrangement.

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 DXA4040 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 74mm, Regulator Type Internal, Voltage 12, Mount Cnt to Cnt 138mm, Shaft Dimension 17.

Additional published details for cross-checking include Product Group 2 ALTERNATORS, Part No. DXA4040, Brand OEX, Description OEX Alternator 12V 45A Denso Style, Adjusting Hole Diameter M8x1.25, Pin Code IR74, Power Rating (Amp) 45, Pulley Section A, Suits Unit Make Denso.

OEX Alternator 12V 45A Denso Style. Part number DXA4040 should be checked first. Listed voltage is 12. Listed output rating is 45. 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.

Compatibility note: Confirm fitment using part number DXA4040, the Denso-style specification, and the listed mounting and pulley measurements before ordering. Do not rely on vehicle or machine model alone where the existing alternator differs in mount, pulley, regulator, or output rating.

FAQ

What is the voltage and output of this alternator?

It is a 12V alternator with a power rating of 45A.

Is this a new or remanufactured unit?

This alternator is listed as new.

What type of regulator does it use?

It uses an internal regulator.

What are the key mounting dimensions?

The listed mounting details are 24mm mount leg thickness, 10mm pivot hole diameter, M8x1.25 adjusting hole diameter, and 138mm mount centre to centre.

What pulley details are listed?

The pulley outside diameter is 74mm and the pulley section is A.

How should I confirm compatibility before buying?

Check the part number DXA4040, the Denso-style design, the 12V 45A rating, the internal regulator, and the listed mount and pulley dimensions against the alternator being replaced.