Technical specifications
| Parameter | Value |
|---|---|
| Outer diameter | 115 mm |
| Shaft bore diameter | 14 mm |
| Mounting type | flat-cut (D-shaft), no keyway |
| Hub height | 16 mm |
| Material | impact-resistant plastic (polypropylene/ABS) |
| Rotation direction | clockwise (verify against the marking on the old part) |
| Cooling type | axial flow, forced ventilation of the motor housing |
| Recommended motor power | up to ~0.55–0.75 kW |
| Compatibility | oil-free and piston compressors with a Ø14 mm shaft and matching flat |
💡 Engineer’s tip: before ordering, measure the old impeller with calipers at three points — outer diameter, bore diameter, and hub height. Even a 1–2 mm difference in hub height can mean the part won’t seat properly on the shaft or will rub against the cover.
Design features
- The blade aerodynamic profile is optimized for efficient cooling of compact oil-free motors around 0.55 kW.
- The flat on the bore prevents the impeller from spinning freely on the shaft during single-phase motor start-up.
- The reduced hub height (16 mm) matches the compact housing design of oil-free compressors, where clearance under the cover is limited.
- The material resists vibration and moderate heat from the compressor housing without deforming over time.
Installation guidelines
- Disconnect the compressor from power and let it cool completely.
- Remove the fan’s protective cover.
- Unscrew the retaining screw/nut of the old impeller and carefully remove it from the shaft; if seized, use a puller rather than prying on the blades.
- Clean the shaft of old grease, rust, and dust, and check for shaft play or runout.
- Fit the new impeller so the bore flat lines up exactly with the shaft flat, with no gap.
- Tighten the retaining part with moderate force — the plastic hub can crack if overtightened.
- Reinstall the cover and rotate the impeller by hand — it should turn freely without touching the cover.
- Run the compressor idle for 1–2 minutes and check for unusual noise or vibration.
Compatibility and similar models
| Impeller diameter | Mount | Hub height | Typical application |
|---|---|---|---|
| D-115 mm | 14 mm, flat | 16 mm | 0.55 kW oil-free compressors (this listing) |
| D-135 mm | 14 mm, flat | 25 mm | small household compressors |
| D-150 mm | 14 mm, flat | 32 mm | medium-power compressors |
⚠️ Ordering note. Impellers are specified by three independent parameters — outer diameter, shaft bore diameter, and hub height. Visually similar parts may not fit the same shaft. Also confirm the mounting type: flat-cut (D-shaft) versus a groove for a retaining ring — these are different fixing systems.
Common replacement mistakes
- Installing without checking that the bore flat lines up with the shaft flat — causes slipping and knocking at start-up.
- Overtightening the retaining nut — cracks the plastic hub.
- Ignoring rotation direction — airflow drops and the compressor overheats within 15–20 minutes of operation.
- Ordering “by eye” from a photo without caliper measurements.
Practical use cases
- Replacing a cracked factory impeller on a 0.55 kW oil-free compressor after several years of use.
- Repair after mechanical damage (broken blade, foreign object ingress).
- Preventive maintenance before a season of intensive use.
FAQ
Will this impeller fit a keyed shaft? No, this model is designed strictly for a flat-cut (D-shaft) mount.
What if the old impeller is destroyed and there’s nothing left to measure? Measure the motor shaft diameter with calipers and the available clearance under the cover — that’s enough to select the right part.
Is this impeller only for 0.55 kW compressors? Its main application is 0.55 kW oil-free compressors, but it will fit other models as long as the mounting dimensions match (Ø14 mm, flat cut, 16 mm hub height).
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