OEX Alternator 12V 20A Kokusan Denki Style DXA4042

The OEX DXA4042 is a new 12V alternator with a 20A power rating, built in Kokusan Denki style and supplied as a single-leg mount unit. It is listed with an external regulator type, a 65mm pulley outside diameter, and a pulley section of A, so those details should be checked against the unit being replaced before ordering.

This alternator is identified as part number DXA4042 and is supplied by OEX in the rotating electrical product group. Key mounting dimensions provided include a 16mm mount leg thickness, 118mm mount centre to centre, an 8mm pivot hole diameter, and an M8x1.25 adjusting hole diameter.

OEX states its products are sourced from market leading original equipment manufacturers and aftermarket suppliers, with factories that are ISO9001 certified to support engineering, testing, and quality control procedures. The listed warranty is 3 years passenger and 1 year commercial, which is an important point to confirm against the vehicle or machine use before fitment.

At 1.2kg, this alternator is a compact unit suited to applications where the physical mounting, pulley, and regulator arrangement must match closely. Because the listing is for Kokusan Denki style fitment, the part number, mount style, voltage, and pulley details matter as much as the application name.

Key Features

• 12V alternator with 20A output
• New unit, not remanufactured
• Single leg alternator mount
• External regulator type
• 65mm pulley outside diameter
• A section pulley

Specifications

• Brand: OEX
• Product type: Alternator
• Voltage: 12V
• Power rating: 20A
• Suits unit make: Kokusan Denki
• Mount leg thickness: 16mm
• Mount centre to centre: 118mm
• Pivot hole diameter: 8mm

Checked applications listed for this alternator

• Atlas Copco XAS88
• BOMAG BW100ADM-2
• BOSS BGP64MH
• GEHL SL3825
• GENIE GS-2668 RT
• GENIE GS-3268 RT
• HITACHI EX12
• HITACHI EX15

Application and Buying Notes

Before buying, compare the part number DXA4042, the 12V system voltage, and the 20A output with the alternator currently fitted to the machine. The mounting details are also specific: single leg mount, 16mm mount leg thickness, 118mm centre-to-centre spacing, 8mm pivot hole, and M8x1.25 adjusting hole.

The pulley arrangement should be checked carefully. This unit has an A section pulley with a 65mm outside diameter, and the regulator type is external. If the existing alternator uses a different pulley size, section, or regulator setup, it should not be assumed to interchange without verification.

The listed applications cover a range of compact equipment and construction machines, including models from Atlas Copco, Bomag, Hitachi, Kubota, Terex O&K, Volvo Construction, Gehl, Genie, and Boss. Even where a model name appears in the application list, the safest approach is to confirm the machine details against the part number and mounting measurements before fitting.

This alternator is supplied new and backed by the stated OEX warranty terms of 3 years passenger and 1 year commercial. Warranty cover depends on correct application, installation, and use, so it is wise to confirm the machine type and operating duty before purchase.

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 DXA4042 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 16mm, Power Rating (Amp) 20, Pulley Section A, Suits Unit Make Kokusan Denki, Alternator Mount Single Leg, New / Reman. New.

Additional published details for cross-checking include Product Group 2 ALTERNATORS, Part No. DXA4042, Brand OEX, Description OEX Alternator 12V 20A Kokusan Denki Style, Adjusting Hole Diameter M8x1.25, Pivot Hole Diameter 8, Pulley Outside Diameter 65mm, Regulator Type External, Voltage 12, Mount Cnt to Cnt 118mm.

OEX Alternator 12V 20A Kokusan Denki Style. Part number DXA4042 should be checked first. Listed voltage is 12. Listed output rating is 20. These details form the core reference points used by parts interpreters when confirming the correct replacement.

Mount style is Single Leg. Regulator type is External. 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 DXA4042, 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 20 should be checked carefully. Incorrect selection can affect installation time, return freight, and equipment availability.

Available application references include ATLAS COPCO XAS88, ATLAS COPCO XAS88 2018, BOMAG BW100ADM-2, BOMAG BW100ADM-2 1999, BOMAG BW100ADM-2 2000, BOMAG BW100ADM-2 2001. 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.

Compatibility note: Confirm fitment using part number DXA4042, the Kokusan Denki style reference, and the mounting and pulley measurements listed above. Do not rely on model name alone; check the existing alternator’s voltage, regulator type, mount layout, and pulley dimensions before ordering.

FAQ

What is the part number for this alternator?

The part number listed is DXA4042.

What voltage and output does it have?

It is a 12V alternator with a 20A power rating.

Is this a new or remanufactured unit?

It is listed as new.

What regulator type does it use?

The alternator is listed with an external regulator type.

What mounting details are provided?

The listed mounting details are single leg mount, 16mm mount leg thickness, 118mm mount centre to centre, 8mm pivot hole diameter, and M8x1.25 adjusting hole diameter.

Which applications are listed for this alternator?

Listed applications include select Atlas Copco, Bomag, Boss, Gehl, Genie, Hitachi, Kubota, Terex O&K, and Volvo Construction models. Fitment should still be confirmed against part number DXA4042 and the physical measurements.