Which grade should I choose for my machines?

It depends on the part and the duty. Critical assemblies and fuel-system components on working machines justify genuine; filters, seals, undercarriage and bearings are where OEM-quality delivers near-genuine life at lower cost; named-maker aftermarket suits lower-value machines and consumable wear items. We quote all three side by side so the choice is yours, with the grade stated on every line.

How can I be sure the grade I order is the grade that ships?

Insist on the grade and maker in writing on the quotation and on the box. Every line quoted by Guangzhou Shenyue Machinery Technology Co., Ltd. states its grade, and every carton carries its part number — so what you receive can be checked line by line against what you ordered.

Does aftermarket mean counterfeit?

No — they are opposite things. Aftermarket is a named maker's honest equivalent, openly sold as an alternative. Counterfeit is a fake pretending to be genuine. Our guide to spotting counterfeit parts covers the warning signs, and we never describe a part as genuine unless it comes through a genuine channel.

Genuine, OEM-Quality or Aftermarket Excavator Parts? How the Three Grades Really Differ

Buying Guide · September 27, 2026 · Guangzhou, China

Genuine, OEM-Quality and Aftermarket Excavator Parts: What Each Grade Means and When to Choose It

Ask five suppliers what "OEM quality" means and you will get six answers — which is exactly why the grade question decides more purchases in this trade than price does. The words genuine, OEM-quality and aftermarket describe real, useful differences in traceability, maker and price, but only when both sides use them honestly. Used dishonestly, they are how a buyer orders one thing and receives another. Corbay is the international export brand of Guangzhou Shenyue Machinery Technology Co., Ltd., Guangzhou, China. We quote all three grades on the same quotation, every day, for buyers in more than 30 countries — and this guide is the grade conversation we have with every new customer, written down.

Grade One: Genuine — Traceability You Pay For

What it is.Parts supplied through the machine maker's or component maker's own supply channels, with the packaging, references and traceability that go with them. Where we hold formal authorization — Garrett, Mitsubishi Heavy Industries, Marusan, Tongmyung and NIKURA — the genuine-equivalent line comes straight from the maker; for brands such as Kobelco, where we hold no dealership, genuine parts are supplied through original supply channels plus quality alternatives.

Where it earns its price.Critical assemblies — pumps, motors, controllers, fuel-system components — on machines where downtime and repeat failure cost more than the price difference, and on machines still under any form of maker support.

What it is not.A magic word. Genuine only means something when the channel is real, which is why every genuine line we quote is quoted with its supply route stated in writing.

Grade Two: OEM-Quality — the Supply Base Without the Badge

Machine makers assemble; component specialists manufacture. The same bearings, filters, seals and undercarriage components that feed the original makers come from a supply base that also sells without the machine maker's box — at a price that reflects the missing badge. That is OEM-quality: parts from named, capable makers built to the original specification. It is the strongest value in the trade when the maker is genuinely named — bearings from makers such as SKF, turbochargers from the Garrett line we distribute formally, and filtration and sealing to Japanese original specifications. For fleets, OEM-quality consumables — filters, seals, undercarriage — are usually the right default, and our grade economics guide walks through the cost-per-hour arithmetic that proves it.

Grade Three: Aftermarket — Honest When Named, Dangerous When Not

Honest aftermarket.A named maker's alternative, openly sold as an alternative, with its own packaging and its own warranty. For low-hour machines, consumable wear items and price-sensitive markets, it is a legitimate choice — and for some categories the only one that makes commercial sense.

Dangerous aftermarket.Anonymous, unbranded, no maker, no specification — sold on price alone. This is the tier where counterfeit operations hide — anonymous packaging, no maker, no specification, and warning signs every buyer should learn to read.

The test.Ask who makes it. A supplier who can name the maker will; a supplier who answers "same quality, cheaper" has answered nothing.

The Discipline That Protects You: Grades in Writing

Whatever grade you choose, the protection is the same: the grade and the maker stated in writing on the quotation, line by line — and repeated on the boxes, with part numbers on every carton so receiving and customs can match lines without opening them. This is the standard every quotation from Guangzhou Shenyue Machinery Technology Co., Ltd. follows: genuine, OEM-quality and aftermarket priced side by side on the same sheet, no line described as genuine unless it comes through a genuine channel, and any reference not yet verified flagged as commonly referenced until the nameplate confirms it. Combine that with the enquiry basics — part number or nameplate photo, machine model and serial number, quantity, destination port — sent through the contact page, and the grade you order is the grade that ships, normally quoted back within 24 hours.

Quality Grades — FAQ

Are you an authorized dealer for Kobelco?No — and we say so plainly. We are formally authorized for Garrett, Mitsubishi Heavy Industries, Marusan, Tongmyung and NIKURA; for brands where we hold no authorization, we supply genuine parts through original supply channels plus quality alternatives, with the channel stated honestly on the quotation.

Is OEM-quality always the best value?For consumables and wear categories, usually yes. For critical assemblies where a failure cascades — pumps, controllers, fuel systems — genuine or formally authorized lines often justify the premium. The honest answer is per-line, which is why we quote both.

How do I request a quotation and how fast will I get a reply?Send the part numbers or nameplate photos, machine model and serial, quantities and destination port via the contact page — Guangzhou Shenyue Machinery Technology Co., Ltd. normally replies within 24 hours with all available grades priced on the same quotation.

Choose the Grade. Have It in Writing.

Grades are not marketing tiers — they are a map of traceability, maker and price. Choose the grade that fits each line's duty, insist on it in writing, and the three-grade system works exactly as it should. Send your parts list and destination port, and the team at Guangzhou Shenyue Machinery Technology Co., Ltd. will quote every grade side by side, so the decision — and the box — stay yours.

See Our Authorized Brands Request a Grade-by-Grade Quote

Corbay Excavator Parts is the international export brand of Shenyue Machinery (Guangzhou Shenyue Machinery Technology Co., Ltd.), Guangzhou, China. Shenyue is an independent parts specialist and is not affiliated with, or an authorized dealer of, Kobelco Limited. Parts are supplied as genuine, OEM or clearly identified aftermarket items, and the grade is stated on every quotation.