Nikko Starter Motor 24V 13 Tooth CW Part No. NXS621

The Nikko starter motor listed here is a 24V unit with 13 teeth, clockwise rotation, and part number NXS621. It is supplied new, with a 3 hole starter mount type, and a stated power rating of 7.7kW for heavy-duty starting applications.

Key physical details include mount centres A of 136mm, mount centres B of 120mm, mount centres C of 120mm, a 100mm flange diameter, and a 13mm mount hole diameter. The pinion diameter is 46mm, and the pinion at rest measures 53mm, so those dimensions should be checked carefully against the unit being replaced.

This starter motor is listed as suitable for wet or dry clutch applications and is described as being built to withstand the harshest environments. It is a Nikko brand starter motor, sold as each, with a one year warranty stated for the product.

Fitment information shown for this part includes Komatsu applications across a broad range of equipment families. Because starter motors need to match the application exactly, the part number, rotation, tooth count, voltage, mounting layout, and pinion dimensions should all be confirmed before ordering.

Key Features

• 24V starter motor
• 13 tooth pinion
• Clockwise rotation
• New unit
• 3 hole starter mount
• Wet or dry clutch application

Specifications

• Brand: Nikko
• Part No.: NXS621
• Product type: Starter Motor
• Voltage: 24V
• Power rating: 7.7kW
• Number of teeth: 13
• Rotation: CW
• Mount type: 3 hole

Known fitment applications

• Komatsu
• Komatsu Compressor
• Komatsu D31
• Komatsu D31-17
• Komatsu D40
• Komatsu D40-5
• Komatsu D41-5
• Komatsu D41E-3

Application and Buying Notes

Before buying, compare the part number NXS621 with the starter motor you are replacing, then confirm the voltage is 24V and the rotation is clockwise. Those are basic checks, but they are not enough on their own; the 13 tooth count and 3 hole mounting pattern need to match as well.

The listed mounting dimensions are specific: mount centres A 136mm, B 120mm, C 120mm, with a 100mm flange diameter and 13mm mount hole diameter. If any of those measurements differ on the machine or on the removed starter, the replacement may not be the correct unit even if it appears similar at first glance.

Pinion dimensions are especially important on starter motors. This unit has a 46mm pinion diameter and a 53mm pinion at rest, so those figures should be checked against the existing starter and the application requirements before the part is fitted.

The fitment data provided points to Komatsu applications, including Komatsu D31, D31-17, D40, D41-5, D45, D57, D66S, GD series machines, and other listed models. If the equipment is one of those applications, use the model details together with the starter specifications rather than relying on appearance alone.

Because this is a 24V, 7.7kW starter motor, it is intended for heavier electrical starting requirements than a smaller unit. Make sure the vehicle or machine system is 24V and that the mounting and drive dimensions align with the replacement starter before proceeding with installation.

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 NXS621 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 STARTER MOTOR, Unit of Measure EACH, Warranty One Year, Mount Centres A 136mm, Mount Centres C 120mm, Number of Teeth 13, Pinion Diameter 46mm, Rotation CW, Voltage 24, New / Reman. New.

Additional published details for cross-checking include Wet / Dry Clutch Wet or Dry, Product Group 2 STARTER MOTORS, Part No. NXS621, Brand NIKKO, Description Nikko Starter Motor 24V 13Th CW, Flange Diameter 100mm, Mount Centres B 120mm, Mount Hole Diameter 13, Pinion at Rest 53mm.

Nikko Starter Motor 24V 13Th CW. Part number NXS621 should be checked first. Listed voltage is 24. These details form the core reference points used by parts interpreters when confirming the correct replacement.

For part number NXS621, 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 starter motor in workshop, fleet, trade, agricultural, or construction service, the listed voltage 24 should be checked carefully. Incorrect selection can affect installation time, return freight, and equipment availability.

Compatibility note: Confirm fitment using part number NXS621 together with the 24V, 13 tooth, clockwise, 3 hole mounting details and the listed Komatsu application information before ordering or fitting.

FAQ

What is the part number for this starter motor?

The part number is NXS621. For this listing, part number NXS621 is the main reference point. Listed voltage is 24. Published fitment references include KOMATSU COMPRESSOR, KOMATSU COMPRESSOR 1986, KOMATSU D31. These details should still be checked against the original unit before ordering.

What voltage is this starter motor?

It is a 24V starter motor. For this listing, part number NXS621 is the main reference point. Listed voltage is 24. Published fitment references include KOMATSU COMPRESSOR, KOMATSU COMPRESSOR 1986, KOMATSU D31. These details should still be checked against the original unit before ordering.

How many teeth does the pinion have?

The pinion has 13 teeth. For this listing, part number NXS621 is the main reference point. Listed voltage is 24. Published fitment references include KOMATSU COMPRESSOR, KOMATSU COMPRESSOR 1986, KOMATSU D31. These details should still be checked against the original unit before ordering.

What rotation does it use?

It is clockwise rotation, shown as CW. For this listing, part number NXS621 is the main reference point. Listed voltage is 24. Published fitment references include KOMATSU COMPRESSOR, KOMATSU COMPRESSOR 1986, KOMATSU D31. These details should still be checked against the original unit before ordering.

Is this starter motor new or remanufactured?

It is listed as new. For this listing, part number NXS621 is the main reference point. Listed voltage is 24. Published fitment references include KOMATSU COMPRESSOR, KOMATSU COMPRESSOR 1986, KOMATSU D31. These details should still be checked against the original unit before ordering.

What warranty is stated?

A one year warranty is stated for this product. For this listing, part number NXS621 is the main reference point. Listed voltage is 24. Published fitment references include KOMATSU COMPRESSOR, KOMATSU COMPRESSOR 1986, KOMATSU D31. These details should still be checked against the original unit before ordering.