The PA B24 is a compact reduction gearbox designed for petrol and diesel engine–driven pressure washer systems rated between 18 and 24 HP. Manufactured by P.A. SpA in Italy, the B24 converts engine speeds of 3,100 RPM down to approximately 1,450 RPM using hardened steel helical gears, providing smooth, quiet power transfer to triplex plunger pumps. Its lightweight construction (under 4 kg) and standard SAE J609B engine flange make it a versatile choice for mobile and skid-mounted washing units across New Zealand.
| Model | B24 |
| Manufacturer | PA (P.A. SpA, Italy) |
| Type | Reduction Gearbox |
| Max Engine Power | 18–24 HP (17.7 kW) |
| Input Speed | 3,100 RPM |
| Output Speed | ~1,450 RPM |
| Gear Ratio | 2.176:1 |
| Gear Type | Hardened steel helical gears |
| Oil Requirement | SAE 80W/90 GL4 (0.35 L capacity) |
| Engine Flange | SAE J609B |
| Pump Bolt Pattern | 62 mm × 62 mm centre-to-centre |
| Weight | ~3.9 kg |
| 50.0062.00 | 1″ (25.4 mm) | 24 mm |
| 50.0060.00 | 1-1/8″ (28.6 mm) | 24 mm |
The B24 gearbox is compatible with a wide range of triplex plunger pumps from leading manufacturers, including:
The 62 mm × 62 mm pump bolt pattern is a common standard across these brands, making the B24 a flexible coupling solution for many pump models.
AES Waterblasters stocks genuine PA gearbox parts and complete B24 units for fast delivery throughout New Zealand. Whether you need a replacement gearbox, seals, or bearings, our team can help you find the right part. Contact us on 09 271 4782 or visit our workshop in East Tamaki, Auckland.
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