Description
Overview:
The Gear Wheel 4:1 Reduction Gear is a genuine Lister Petter OEM component for single-cylinder Petter diesel engines, notably AA1 and AB1. Made from tough, machined steel with precision-cut teeth, it reduces output speed by a factor of four while transmitting power smoothly to the driven equipment. This helps deliver higher usable torque at lower shaft speed, improving control and protecting downstream parts. Supplied as unused old stock, the gear remains functional but may show light tarnishing or storage marks typical of vintage parts. Built to OEM tolerances, it offers a direct fit within the engine's lubricated drive train and maintains original performance and reliability on these classic industrial units.
Key Features:
- Genuine Lister Petter OEM part for assured fit and compatibility
- 4:1 reduction ratio for slower output speed and higher usable torque
- Durable machined steel with precision-cut teeth for smooth operation
- Direct replacement for AA1 and AB1 engines; no modifications typical
- Helps maintain original performance on vintage engines
- Unused old stock; cosmetic tarnish possible, function unaffected
- Designed to run within the engine's lubricated gear train
- Supports efficient power transmission and reduces wear on driven components
Typical Applications:
Used when overhauling or restoring Petter AA1/AB1 engines that drive site generators, water pumps, compressors, cement mixers, conveyor or agricultural machinery. Ideal for achieving controlled low-speed output for alternators and mechanical drives, especially where smooth torque delivery and long service life are required in stationary plant, small construction equipment, and workshop power units.
Also known as:
Reduction drive wheel, 4:1 ratio wheel, speed-reducer gearwheel, transmission drive wheel, drive gear for Petter singles, power reduction wheel, output reduction wheel, OEM AAJ25 gearwheel.
Fits Models:
AA1, AB1
Alternate Part Numbers:
AAJ25
Product Specifications
| L&S Part No. | AAJ 25 |
|---|---|
| Part Type | Genuine Part |
| Manufacturer | Lister Petter |
| OEM No. | AAJ 25 |
| Unit of Sale | 1 |
| Size | 4:1 |
| Machine Type | Engines |
| Fits Brands | Lister Petter |
| Key Features | - Genuine Lister Petter OEM part for AA1 and AB1 engines - 4:1 reduction ratio for higher torque at lower speeds - Machined steel with precision-cut teeth for smooth operation - Direct replacement; no modifications needed for fit - Designed for lubricated drive train in vintage engines |
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