| Fit and compatibility | Designed for a specified power tiller model and part number; normally the lowest fitment risk. | Made to match listed dimensions, mounting points, and operating specifications; model verification is essential. | Fit depends on the donor machine, wear, modifications, and the accuracy of the seller’s identification. |
| Typical examples | Engine components, transmission gears, clutch assemblies, control cables, seals, and manufacturer-specified blades. | Belts, bearings, filters, cables, seals, wheels, blades, and other parts made to published dimensions. | Gearboxes, shafts, wheels, pulleys, covers, frames, and other recoverable assemblies. |
| Material and manufacturing consistency | Usually consistent with the equipment maker’s specified material, heat treatment, and production tolerances. | Varies by manufacturer; confirm material grade, hardness, dimensions, and applicable specifications where relevant. | Existing condition varies; inspect for cracks, corrosion, distortion, fatigue, and previous repairs. |
| Condition when purchased | New. | Usually new, although the seller’s condition statement should be checked. | Previously used; condition should be supported by photographs, measurements, or an inspection report. |
| Indicative purchase cost | Highest initial cost; use as the reference value of 100% for comparison. | Often about 50%–80% of a comparable genuine part, depending on specification and supplier. | Often about 20%–50% of a new genuine part, excluding inspection, refurbishment, and shipping costs. |
| Expected service-life certainty | Generally the most predictable when installed and operated according to the equipment specifications. | Can be comparable when dimensions, material, load rating, and manufacturing quality meet the required specification. | Least predictable because remaining life depends on prior use, maintenance, storage, and wear. |
| Warranty and return support | Often has the clearest warranty and return process, subject to seller terms and installation requirements. | Warranty length and coverage vary considerably; check exclusions for incorrect fitment or installation. | May have limited or no warranty; confirm the return period and whether testing is permitted. |
| Availability | Good for current and commonly supported models; older parts may require special ordering. | Usually widely available for common wear items and standard dimensions. | Useful for discontinued equipment, but supply and condition are inconsistent. |
| Installation risk | Low, provided the correct model and part number are confirmed. | Medium; compare dimensions, thread type, electrical connections, belt size, and load rating before purchase. | High unless the part is measured and inspected before installation. |
| Best use case | Safety-critical, high-load, precision-fit, or difficult-to-access components. | Routine maintenance parts where specifications can be verified and cost control is important. | Budget repairs, discontinued models, or non-critical components with sufficient inspection time. |
| Main selection rule | Choose when reliability, fit certainty, and support are more important than the lowest purchase price. | Choose when the part’s dimensions, materials, performance rating, and return terms are clearly documented. | Choose only after checking wear, structural integrity, measurements, and the total cost of possible refurbishment. |