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| SERVICE | DELIVERY PRICE | DELIVERY TIME |
|---|---|---|
| Standard Delivery | £9.95 | 7 to 10 working days |
| SERVICE | DELIVERY PRICE | DELIVERY TIME |
|---|---|---|
| Standard Delivery | £9.95 | 7 to 10 working days |
| SERVICE | DELIVERY PRICE | DELIVERY TIME |
|---|---|---|
| Standard Delivery | £4.99 | 1 to 2 working days |
| SERVICE | DELIVERY PRICE | DELIVERY TIME |
|---|---|---|
| Standard Delivery | £9.95 | 5 to 7 working days |
| SERVICE | DELIVERY PRICE | DELIVERY TIME |
|---|---|---|
| Standard Delivery | £9.95 | 7 to 10 working days |
Product Number: 12251N-1G
The WAI 12251N-1G is a brand-new 24V 25A alternator. It is built to the Nikko IR/EF specification, designed to replace original-equipment alternators across a broad range of Komatsu plant machinery. With 36 verified OE cross-references — including Remy 50601, Remy 93017, and Komatsu 600-821-6110 through 600-821-6160 — this unit is a well-documented replacement for worn or failed alternators on Komatsu dozer and earthmoving fleets.
Constructed to Nikko's internal-regulator, externally-fan-cooled (IR/EF) design standard, the alternator delivers consistent 25A output at 24V with clockwise rotation and a groove pulley, matching the form and function of the original Nikko-sourced units fitted at the factory. Being supplied brand new — not remanufactured — means there are no worn bearings, degraded windings, or previous-use compromises to contend with.
The fitment record covers 73 Komatsu applications, with confirmed fit on models including the D20, D20A, D20P, D20S, D21, D21A, D21P, and D21S. Use the selection widget or search by OEM number to verify fit for your specific machine and serial range, or ask Simon if your variant is not listed. Every application shown is covered by our Fit Guarantee.
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| Type | Alternator |
|---|---|
| Manufacturer | Nikko |
| Design | IR/EF |
| Voltage | 24V |
| Output | 25A |
| Rotation | CW |
| Pulley | Groove Pulley |
| Condition | Brand New |
| Engine Parts | Product Number | Product Name | Recommended Units | Product Price |
|---|
Exploring the WAI Starter Motor and Alternator at Partsformachines.com Introduction: In the Plant and Agriculture sector, a starter motor and alternator are parts that ensure a machine runs smoothly. At Partsformachines.com we have partnered with WAI, a global manufacturer of auto and plant machinery parts to off...
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Delivery Estimate: 1 to 2 working days
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| Technical Specification | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PRODUCT NUMBER | 14482N | 20539N | 21610N | 23853N | 21173N | 22155N | 23791N | 8440N | A4033 | A4058 | A4072 | A4084 | A4085 | A4103 | A9012 |
| Voltage | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 |
| Output Current | 120 | 124 | 90 | 90 | 110 | 90 | 100 | 105 | 70 | 80 | 70 | 85 | 110 | ||
| Design | IR/IF | IR/IF | IR/IF | IR/IF | IR/IF | IR/IF | |||||||||
| Manufacturer | Marelli | Marelli | Electroprecizia | VISTEON | Marelli | Ford | Mando | Ford | |||||||
| Pulley | COUPLER | S6 | S6 | SC7 | S6 | AP | AP | AP | AP | AP | AP | ||||
| Rotation | CW | CW | CW | CW | |||||||||||
A. This alternator fits 73 Komatsu applications, including the D20, D20A, D20P, D20S, D21, D21A, D21P, and D21S. Use the selection widget to match your exact model and serial range, search the cross-referenced catalogue by OEM number or machine model, or ask Simon if your variant is not listed. Every fitment shown is backed by our Fit Guarantee.
A. Yes. The WAI 12251N-1G carries verified cross-references to Remy 50601 and Remy 93017, making it a confirmed replacement for those units. The part holds 36 OE cross-references in total across Remy, Komatsu, and Nikko part numbers — search the catalogue by any of those references to confirm your application.
A. Confirmed Komatsu OE cross-references include KOMATSU 600-821-6110, 600-821-6120, 600-821-6130, 600-821-6140, 600-821-6150, 600-821-6160, and Komatsu 6008216110 — seven Komatsu references among 36 OE numbers in total. Search by any of these numbers in the catalogue to verify fit for your machine.
A. The WAI 12251N-1G operates at 24V with a 25A output, clockwise rotation, and a groove pulley. It is built to Nikko's IR/EF (internal regulator, external fan) design standard and is supplied brand new.
A. This is a brand-new alternator — not remanufactured or reconditioned. It is supplied as new-old-stock to the original Nikko IR/EF specification, with no prior service history.
A. Use the selection widget to match your make, model and engine, or search our cross-referenced catalogue by OEM number, machine model or equivalent part across brands. If your vehicle is not listed, ask Simon. Every fitment shown is backed by our Fit Guarantee.
A. Yes. Every vehicle and OE cross-reference shown for this part is checked against manufacturer data and backed by our Fit Guarantee. If it is not right, our Fit Guarantee or hassle-free returns have you covered.
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