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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: 20639N
The WAI 20639N is a brand-new 12V 34A alternator. It is built to the Lucas IR/EF design, replacing Lucas original-equipment references 23975A and A115-34A. It is a direct-fit replacement for Massey Ferguson and Ursus machines, covering four recorded applications across both makes — including Massey Ferguson Various and Ursus 2812, 3512, and 3514 variants.
Constructed to Lucas IR/EF specification, the 20639N delivers 34 amperes of output at 12 volts with clockwise rotation, matching the electrical architecture of the machines it serves. Being supplied brand new — not remanufactured or reconditioned — it offers a clean installation without the uncertainty of exchange-unit condition.
The Lucas IR/EF design is a well-established alternator architecture used across agricultural and plant equipment. Replacing an ageing or failed unit with the WAI 20639N restores the charging system to its original performance standard, using an alternator engineered to match the original output and rotation characteristics.
About PartsForMachines:
PartsForMachines is a premier e-commerce platform, founded in 2019 in Warwickshire, UK, specializing in aftermarket parts and services for construction, agriculture, and industrial machinery. We offer an extensive catalog of over 500,000 products. Standard delivery: 1–3 working days within UK mainland. We are proud to be an authorised distributor, giving customers extra confidence when purchasing genuine products from us. In addition, we provide a 30-day return policy for eligible items.
| Type | Alternator |
|---|---|
| Design | Lucas IR/EF |
| Voltage | 12V |
| Output | 34A |
| Rotation | CW |
| 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...
Standard Delivery: £4.99
Delivery Estimate: 1 to 2 working days
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| Technical Specification | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PRODUCT NUMBER | A4011 | A4012 | A4014 | A4108 | A4113 | A4117 | 12398N-OE | 12428N | 8826N | 12090N | 12365N | 12429N |
| Voltage | 12 | 12 | 12 | 12 | 12 | 12 | 24 | 24 | 12 | 12 | 12 | 12 |
| Output Current | 55 | 70 | 70 | 55 | 70 | 36 | 55 | 30 | 36 | 55 | 72 | 70 |
| Design | A127MT IR/EF | IR/EF | IR/EF | IR/EF | IR/EF | A127 IR/EF | ||||||
| Manufacturer | Lucas | Lucas | Lucas | Lucas | Lucas | Lucas | ||||||
| Pulley | AP | AP | AP | AP | AP | AP | Groove Pulley | Groove Pulley | Groove Pulley | Groove Pulley | Groove Pulley | Groove Pulley |
| Rotation | Bi-directional | CW | CW | CW | CW | CW | ||||||
A. The WAI 20639N replaces Lucas original-equipment references 23975A and A115-34A, along with Massey Ferguson reference 1668906M93 and Ursus reference MF23 — four OE cross-references in total. If you are matching by OE number, search our cross-referenced catalogue or ask Simon to confirm your specific application.
A. The 20639N covers Massey Ferguson Various (all) and Ursus 2812, 3512, and 3514 (all variants) — four applications across both makes. Use the selection widget to match your exact make, model, and engine, or search by OE number. Every fitment shown is backed by our Fit Guarantee.
A. It is a brand-new 12V, 34-amp alternator built to the Lucas IR/EF design with clockwise rotation. It is supplied new — not remanufactured — so there is no exchange unit to return.
A. The WAI 20639N is supplied brand new. It is not a remanufactured or reconditioned unit, so there is no core or exchange surcharge and no used-unit condition to contend with.
A. Yes — ask Simon, or WhatsApp our team on 07754 288583 with any questions about specifications, suitability, or compatibility.
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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