Ask for a track roller with the wrong vocabulary and the quotation comes back wrong. Undercarriage numbers on Kobelco machines do not follow the LC and VH prefixes that rule engine and hydraulic parts; they belong to their own numbering family, they often carry suffixes that mark casting and hardware variants, and the same physical roller can legitimately be quoted under two numbers. The parts desk at Guangzhou Shenyue Machinery Technology Co., Ltd. checks every undercarriage line against the machine before it ships, and this guide explains what we check and why.
A real example: the SK330-8 track roller
The roller on this page's card is quoted as 24100N7035F3J1B and 24100N7035F3CN for the SK330-8 class. One casting, two quoted numbers — a pattern buyers meet constantly in undercarriage. The suffixes mark sourcing and hardware variants of the same fitment, and suppliers legitimately hold stock under either number. What matters to the buyer is not which number is "right" but that the fitment — machine class, roller count, diameter, width and flange pattern — matches what came off the machine.
What the number will not tell you
Unlike an engine part with a stamped nameplate, an undercarriage part wears its identity off. A roller that has been in abrasive rock for 8,000 hours shows no number at all. So the match is confirmed by measurement and context, not by reading a worn casting:
| Check | Why it matters |
|---|---|
| Machine model and serial number | The class fixes the family; the serial fixes the build revision |
| Count and position | Track rollers and carrier rollers differ; a wrong count means a wrong frame family |
| Roller diameter and track width | Neighbouring classes share shapes but not sizes |
| Flange and boss pattern | Single or double flange, and the mounting bosses, must match the frame |
| Photograph of the worn part | Shows the variant the factory actually fitted to your build |
Where buyers go wrong
The classic mistake is ordering by machine model alone. Within the SK range the same nominal tonnage can carry different undercarriage families across build years and markets, and a roller that looks right but sits a few millimeters narrower will chew the flanges on both sides of the chain within days. The second mistake is mixing undercarriage suppliers across one machine — bushings, links and rollers from different hardness classes wear against each other and the matched-set life of the whole running gear drops. Quote the undercarriage as a system, even if you buy it in stages across a season.
How undercarriage quoting works here
Rollers, idlers, sprockets, track links and shoes quote per machine class with the fitment confirmed first, then the grade — genuine, OEM or aftermarket — stated on every line. Some classes ship from the shelf; longer-lead classes quote against the order with a realistic production window rather than a hopeful promise. The resolution step runs through our part number search, which maps a number to its machine class, and the prefix logic that governs the rest of the machine — the engine and hydraulic families — is explained separately in our part number prefix guide, because undercarriage deliberately sits outside it. Kobelco's own parts information remains the reference for what the factory fitted to each build, and Guangzhou Shenyue Machinery Technology Co., Ltd. treats it as the cross-check, not the substitute, for what your machine actually wears.
Before you order
One message with four facts — model, serial, part type, and photographs of the worn part with measurements — is enough for a same-day quotation that will actually fit. Guangzhou Shenyue Machinery Technology Co., Ltd. answers undercarriage enquiries with the fitment confirmed in writing, so the grade decision is the only one left to make. Skipping the photographs is how a 30-tonne class roller ends up in a 25-tonne class frame, and nobody discovers it until the chain is off and the truck has left.
Frequently Asked Questions
What is Kobelco part number 24100N7035F3J1B?
It is a track roller fitment for the SK330-8 class, quoted alongside 24100N7035F3CN — the same casting under a sourcing variant. Guangzhou Shenyue Machinery Technology Co., Ltd. confirms diameter, width and flange pattern against your serial number before dispatch.
Why does one Kobelco roller have two part numbers?
Suffix variants mark sourcing and hardware differences within the same fitment, so the same roller is legitimately quoted under either number. What matters is that machine class and measurements match, which Guangzhou Shenyue Machinery Technology Co., Ltd. verifies from photographs and the serial number.
Can I order undercarriage parts by model name alone?
You can start there, but we confirm before quoting. Build revisions within the same model can carry different roller sizes and flange patterns. Send the serial number and a measured photograph of the worn part to Guangzhou Shenyue Machinery Technology Co., Ltd. for a fitment-confirmed quotation.
Do you supply undercarriage parts as genuine or aftermarket?
All three grades, stated on every line. Guangzhou Shenyue Machinery Technology Co., Ltd. quotes genuine, OEM and aftermarket for rollers, idlers, sprockets and track groups across the SK range from SK60 to SK850LC, and marks every item so you know exactly which grade ships.