Nikko Starter Motor 24V 11 Tooth CW Part No. NXS612 OEM 0-21000-4851

The Nikko starter motor listed here is a 24V, clockwise rotating unit with 11 teeth, part number NXS612 and OEM number 0-21000-4851. It is a new starter motor, supplied each, with a 5.5kW power rating and a one year warranty.

Mounting and size details matter on starter motors, and this unit uses a 3 hole starter mount with 136mm mount centres A, 120mm mount centres B, and 120mm mount centres C. The flange diameter is 100mm, the mount hole diameter is 13mm, and the overall length is 355mm.

This starter has a pinion diameter of 46mm and a pinion at rest measurement of 52mm. It weighs 11kg and is listed for use with wet or dry clutch applications, so the physical pattern and electrical specification should be checked carefully against the original unit before purchase.

Key Features

• 24V starter motor
• 11 tooth pinion
• Clockwise rotation
• 5.5kW power rating
• New unit
• 3 hole starter mount

Specifications

• Brand: Nikko
• Part No.: NXS612
• OEM Number: 0-21000-4851
• Type: Starter Motor
• Voltage: 24V
• Number of Teeth: 11
• Rotation: CW
• Power Rating: 5.5kW

Confirmed application details

• To suit: Komatsu D50 with 4D130 engine

Application and Buying Notes

Before ordering, compare the part number NXS612 and OEM number 0-21000-4851 with the starter currently fitted to the machine. The voltage is 24V, the rotation is clockwise, and the unit has 11 teeth, so those details need to match the existing application as well as the mounting layout.

The physical measurements are just as important as the electrical rating. Check the 3 hole mount pattern, 136mm mount centres A, 120mm mount centres B and C, 100mm flange diameter, 13mm mount hole diameter, and 355mm overall length against the removed starter so the replacement sits correctly and engages properly.

For confirmed application, the listed fitment is Komatsu D50 with 4D130 engine. If the machine, engine, or mounting dimensions differ from the details above, take time to verify before fitting. Starter motor replacement is one of those jobs where a close look at the original unit saves time and avoids unnecessary returns.

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 NXS612 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 11, Pinion at Rest 52mm, Power Rating 5.5kW, Suits Unit Make Nikko, Item Type Starter Motor.

Additional published details for cross-checking include Starter Mount Type 3 Hole, OEM Number 0-21000-4851, Product Group 2 STARTER MOTORS, Part No. NXS612, Brand NIKKO, Description Nikko Starter Motor 24V 11Th CW, Flange Diameter 100mm, Mount Centres B 120mm, Mount Hole Diameter 13.

Nikko Starter Motor 24V 11Th CW. Part number NXS612 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 NXS612, 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.

Available application references include KOMATSU COMPRESSOR, KOMATSU COMPRESSOR 1986, KOMATSU COMPRESSOR 1999, KOMATSU D40. 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 One Year. Warranty terms should be considered alongside correct application and part identification, as warranty does not replace fitment confirmation.

Compatibility note: Confirm compatibility by matching the part number NXS612, OEM number 0-21000-4851, 24V electrical system, clockwise rotation, 11 teeth, and the mounting measurements against the original starter and machine application before purchase.

FAQ

What is the voltage of this starter motor?

It is a 24V starter motor. For this listing, part number NXS612 is the main reference point. Listed voltage is 24. Published fitment references include KOMATSU COMPRESSOR, KOMATSU COMPRESSOR 1986, KOMATSU COMPRESSOR 1999. These details should still be checked against the original unit before ordering.

What is the rotation direction?

The starter motor rotates clockwise, noted as CW. For this listing, part number NXS612 is the main reference point. Listed voltage is 24. Published fitment references include KOMATSU COMPRESSOR, KOMATSU COMPRESSOR 1986, KOMATSU COMPRESSOR 1999. These details should still be checked against the original unit before ordering.

How many teeth does the pinion have?

It has 11 teeth. For this listing, part number NXS612 is the main reference point. Listed voltage is 24. Published fitment references include KOMATSU COMPRESSOR, KOMATSU COMPRESSOR 1986, KOMATSU COMPRESSOR 1999. These details should still be checked against the original unit before ordering.

What vehicle or machine application is listed?

The listed application is Komatsu D50 with 4D130 engine. For this listing, part number NXS612 is the main reference point. Listed voltage is 24. Published fitment references include KOMATSU COMPRESSOR, KOMATSU COMPRESSOR 1986, KOMATSU COMPRESSOR 1999. These details should still be checked against the original unit before ordering.

What are the key mounting measurements?

The starter uses a 3 hole mount with 136mm mount centres A, 120mm mount centres B, 120mm mount centres C, a 100mm flange diameter, and 13mm mount holes. For this listing, part number NXS612 is the main reference point. Listed voltage is 24. Published fitment references include KOMATSU COMPRESSOR, KOMATSU COMPRESSOR 1986, KOMATSU COMPRESSOR 1999. These details should still be checked against the original unit before ordering.

Is this a new or remanufactured starter motor?

It is listed as new. For this listing, part number NXS612 is the main reference point. Listed voltage is 24. Published fitment references include KOMATSU COMPRESSOR, KOMATSU COMPRESSOR 1986, KOMATSU COMPRESSOR 1999. These details should still be checked against the original unit before ordering.