Niehoff Alternator 24V 175A Pad Mount External Regulator Part No. NXA9303

The Niehoff Alternator 24V 175A is a new heavy duty alternator sold each, with part number NXA9303 and a 24 volt, 175 amp power rating. It uses a pad mount arrangement and an external regulator, so correct identification of the mounting style and charging system layout matters before ordering.

This unit has a 190mm mount centres C measurement, 126mm inside mounting legs, 99.6mm mount leg thickness, and a 22mm shaft diameter. The pulley section is listed as not applicable, and the alternator is specified for clockwise or counter-clockwise rotation.

Niehoff describes this alternator as a heavy duty brushless design intended for demanding applications where downtime needs to be kept down and operating efficiency needs to be maintained. It carries a one year warranty and weighs 23.7kg, which is useful information when checking handling, installation support, and replacement planning.

Key Features

• 24V, 175A alternator
• New unit, sold each
• External regulator type
• Pad mount alternator
• Rotation: CW/CCW
• Heavy duty brushless design

Specifications

• Brand: Niehoff
• Part No.: NXA9303
• Voltage: 24V
• Power Rating: 175 amp
• Alternator Mount: Pad
• Regulator Type: External
• Mount Centres C: 190mm
• Inside Mounting Legs: 126mm

Fitment guidance

• Fitment data supplied includes Caterpillar applications such as 24M, 793B, 793C, 793D, 793F, 797F and R1700.
• Sample application references include Caterpillar 24M 2001 and Caterpillar 793B 1990.
• Use the part number NXA9303 and the listed mounting and electrical details to confirm the replacement before purchase.

Application and Buying Notes

The key checks for this alternator are the 24V system, 175A output, pad mount design, and external regulator arrangement. Those details need to line up with the vehicle’s charging system and the physical mounting points, especially where the 190mm mount centres C, 126mm inside mounting legs, and 99.6mm mount leg thickness are used for identification.

The shaft diameter is 22mm and the pulley section is not applicable, so it is worth confirming the existing unit’s front-end arrangement rather than assuming a like-for-like changeover from appearance alone. Rotation is listed as CW/CCW, which may help in application matching, but it should still be checked against the existing setup and mounting orientation.

Because the unit weighs 23.7kg, handling and installation should be planned accordingly. The alternator is new, carries a one year warranty, and is supplied under Niehoff part number NXA9303. Those are the most reliable reference points when comparing against an existing alternator or a vehicle parts listing.

Where Caterpillar applications are involved, do not rely on model family names alone. Confirm the exact application, year reference where shown, and the physical dimensions before ordering. If the original alternator has a different regulator type, mount style, shaft size, or mount centres, the unit may not be the correct replacement even if the model family appears similar.

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 NXA9303 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 Centres C 190mm, Power Rating (Amp) 175, Regulator Type External, Suits Unit Make Niehoff, Note Rotation CW/CCW, New / Reman. New.

Additional published details for cross-checking include Product Group 2 ALTERNATORS, Part No. NXA9303, Brand NIEHOFF, Description Niehoff Alternator 24V 175A, Inside Mounting Legs 126mm, Mount Leg Thickness 99.6mm, Pulley Section Not Applicable, Shaft Diameter 22mm, Voltage 24, Alternator Mount Pad.

Niehoff Alternator 24V 175A. Part number NXA9303 should be checked first. Listed voltage is 24. Listed output rating is 175. These details form the core reference points used by parts interpreters when confirming the correct replacement.

Mount style is Pad. Regulator type is External. Pulley configuration is Not Applicable. Those physical and electrical details should line up with the original unit before the replacement is approved for fitment.

For part number NXA9303, 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 24 and output 175 should be checked carefully. Incorrect selection can affect installation time, return freight, and equipment availability.

Compatibility note: Confirm fitment with part number NXA9303, 24V 175A output, pad mount design, external regulator type, and the listed dimensions before purchase. If the original unit differs in mount centres, leg measurements, shaft diameter, or regulator arrangement, verify the application carefully with the vehicle details.

FAQ

What is the part number for this alternator?

The part number is NXA9303. For this listing, part number NXA9303 is the main reference point. Listed voltage is 24. Listed output rating is 175. Published fitment references include CATERPILLAR 24M, CATERPILLAR 24M 2001, CATERPILLAR 793B. These details should still be checked against the original unit before ordering.

What voltage and output does this alternator have?

It is a 24V alternator with a 175A power rating. For this listing, part number NXA9303 is the main reference point. Listed voltage is 24. Listed output rating is 175. Published fitment references include CATERPILLAR 24M, CATERPILLAR 24M 2001, CATERPILLAR 793B. These details should still be checked against the original unit before ordering.

Is this alternator new or remanufactured?

It is listed as new. For this listing, part number NXA9303 is the main reference point. Listed voltage is 24. Listed output rating is 175. Published fitment references include CATERPILLAR 24M, CATERPILLAR 24M 2001, CATERPILLAR 793B. These details should still be checked against the original unit before ordering.

What type of regulator does it use?

It uses an external regulator. For this listing, part number NXA9303 is the main reference point. Listed voltage is 24. Listed output rating is 175. Published fitment references include CATERPILLAR 24M, CATERPILLAR 24M 2001, CATERPILLAR 793B. These details should still be checked against the original unit before ordering.

What mount style is listed for this alternator?

The alternator mount is listed as pad mount. For this listing, part number NXA9303 is the main reference point. Listed voltage is 24. Listed output rating is 175. Published fitment references include CATERPILLAR 24M, CATERPILLAR 24M 2001, CATERPILLAR 793B. These details should still be checked against the original unit before ordering.

Which applications are mentioned in the fitment data?

The fitment data includes Caterpillar applications such as 24M, 793B, 793C, 793D, 793F, 797F and R1700, with sample references including Caterpillar 24M 2001 and Caterpillar 793B 1990. For this listing, part number NXA9303 is the main reference point. Listed voltage is 24. Listed output rating is 175. Published fitment references include CATERPILLAR 24M, CATERPILLAR 24M 2001, CATERPILLAR 793B. These details should still be checked against the original unit before ordering.