Buying guides
Genuine, OEM or Aftermarket? Choosing Agricultural Machinery Parts
The difference between genuine, OEM and aftermarket parts, and when to use each. Selection criteria, the real cost of downtime, and how to spot counterfeit parts.
When a part fails on a farm machine, you usually face several options at very different prices. The right choice doesn’t depend only on the price on the invoice; it depends on where that part works in the machine and what it costs you if it fails again.
Three kinds of part
- Genuine: sold under the machine manufacturer’s own name and packaging.
- OEM: made by the same company that supplies the machine manufacturer, but sold under its own brand. Quality can match genuine.
- Aftermarket: made by an independent manufacturer to the original part’s specification. Quality in this group ranges from excellent to very poor.
Critical part or wear part?
The most important question is where the part works.
Critical parts — main bearings, gearbox gears, hydraulic components and engine internals — work under high load and tight tolerances. When they fail they usually damage other parts too. Here, quality and an exact match to spec come first.
Wear and consumable parts — knife sections, guards and some belts — are replaced regularly. In this group a good aftermarket part from a reputable supplier can be an economical, sensible choice.
The real cost isn’t just the part price
A cheap part that fails early often ends up costing more. When you compare, include:
- Labour and time to replace it again
- Days the machine stands idle during the season
- Damage the failure does to neighbouring parts
- Crop that isn’t harvested on time
How to choose an aftermarket part
- Part number match: it must correspond exactly to the original part number.
- Material and heat treatment: for wear parts, surface hardness and steel grade determine service life.
- Dimensional accuracy: dimensions, holes and tolerances must match the original.
- Warranty and support: buy from a supplier who stands behind what they sell.
Signs of a counterfeit part
A counterfeit is different from a legitimate aftermarket part: it pretends to be genuine. Watch for:
- Poorly printed packaging, spelling mistakes or an odd-looking logo
- Rough surface finish, uneven paint or unfinished machining marks
- Noticeably lighter weight than the original
- Missing numbers or markings that the genuine part carries
- A price that is unusually low
At Daghigh Sayesh we check every part number and application before recommending a part, so the option we suggest fits both your machine and your budget.
