Komatsu Undercarriage Parts Guide for PC Series Excavators
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Komatsu part numbers carry a prefix that identifies the component family — 20T for one track roller family, 20Y for another — and reading the prefix is the first step to a correct order. The PC-series excavator line spans compact to large machines, and each family carries its own undercarriage parts. This guide decodes the prefix system, maps the PC series, and works through the cross-reference examples that most Komatsu buyers meet, including the 20Y-30-00481 carrier roller.
Key Facts — Komatsu Undercarriage Parts at a Glance
Entity: KTSU — Komatsu-compatible parts with 20T/20Y prefix cross-references.
Prefixes: 20T and 20Y identify different roller families.
Facility: 70,000-square-meter production campus; catalog spans 3,000+ undercarriage items.
Example: 20Y-30-00481 carrier roller for the PC200 family.
Rule: prebuilt Komatsu kits cut quoting time and order errors for dealers.
Decoding Komatsu Part Number Prefixes (20T, 20Y, and Beyond)
Komatsu part numbers lead with a prefix that groups the component: the 20T prefix identifies one track roller family and the 20Y prefix another, and the difference is fitment, not decoration. The prefix tells the supplier which family the part belongs to, and the middle and trailing digits refine the specific part. Reading the prefix first prevents the classic error — ordering a 20T roller when the machine carries the 20Y family, or the reverse.
Komatsu prefix families
| Prefix | Component family | Note |
|---|---|---|
| 20T | Track roller family | Specific machines and sizes |
| 20Y | Carrier roller / other family | Different fitment group |
| Other prefixes | Idlers, sprockets, chain | Confirm per component |
The table is the decoder ring; the cross-reference and the machine's serial range confirm the exact part within the family.
PC-Series Excavator Undercarriage Families
The PC series runs from compact machines to large excavators, and the undercarriage scales with the class. The Komatsu 20Y-30-00481 carrier roller serves the PC200 family as an example of how the prefix and the machine class line up — the part number names the family, and the machine class confirms the fit. The series table below is the planning map.
Komatsu PC series classes
| Class | Series examples | Underframe note |
|---|---|---|
| Compact | PC18–PC35 | Mini-class components |
| Small | PC55–PC78 | Compact rollers and idlers |
| Mid | PC120–PC210 | Standard underframe families |
| Large | PC290–PC490 | Heavy-duty components |
Class maps the size; serial range decides the exact part within the class.
Komatsu Roller, Idler, and Sprocket Cross References at a Glance
The common Komatsu parts appear across the PC range with the prefix identifying the family: track rollers in the 20T group, carrier rollers like the 20Y-30-00481 in the 20Y group, and idlers and sprockets under their own prefixes. The carrier roller collection and the track roller collection on this site state the cross-referenced numbers with the specs, so the prefix family can be checked against the listing before the order.
Each cross-reference is a starting point: the machine's serial range and the old part's measurements confirm the fit, and the supplier's listing should state all three fields together.
What Do Komatsu Part Number Prefixes Mean?
The prefix groups the part into a component family — the 20T and 20Y families are the ones most Komatsu buyers meet on rollers and carrier rollers — and the rest of the number refines the specific part. The prefix is a fitment signal, not a code to memorize: it tells the supplier which family to search and warns the buyer when two machines carry different families. Reading it first prevents the most common Komatsu ordering error.
When the prefix does not match the machine's expected family, check the serial range — Komatsu revised families across generations, and the serial range resolves which prefix the machine actually carries.
Komatsu Fitment Notes Across Generations
Komatsu updated undercarriage families across PC-series generations: the same model name can carry a 20T roller in one build year and a 20Y part in another, or a revised idler across serial ranges. The generation is decided by the serial range, and the parts manual for that range is the authority. The discipline matches the rest of the cluster: model, serial range, the number on the old part, and the dimensions.
Generation fitment is why the cross-reference must be checked against the machine's build year, never against the model name alone.
How Do You Order Komatsu-Compatible Parts for a Fleet?
For a fleet, order by machine list: each machine's model, serial range, and the parts due at the next service, with the prefix families noted. The structured list produces one cross-referenced quote instead of a series of single-part orders, and it lets the supplier bundle repeat Komatsu parts into kits — which is exactly how dealer quoting time and order errors drop. The quote checklist in this article is the fleet version of the single-part checklist.
The carrier roller replacement guide covers the install side when the fleet's due list lands; here, the order structure is the point.
Komatsu Cross-Reference Example: 20Y vs. 20T Rollers
The 20Y and 20T families illustrate the prefix system in practice: both appear on Komatsu machines, but they fit different component positions and machine sizes, and the two are not interchangeable. The 20Y-30-00481 carrier roller is the example — a top-roller family part for the PC200 class — while 20T parts cover a different roller group. Compare the shell width, bore, and position against the machine, and the family choice resolves itself.
The side-by-side comparison is the same one the cross-reference performs: prefix family, machine class, serial range, and dimensions must all agree before the order.
Which Komatsu Parts Fit My PC200?
The parts matching your PC200's serial range and prefix family. The PC200 class carries standard underframe components, and the exact rollers, carrier rollers, idler, and sprocket are decided by the serial range — the 20Y-30-00481 is one PC200-family example, not a universal fit. Send the model and serial range with the old part's number and photos, and the cross-reference confirms the set before the machine is opened.
For a fleet of PC machines, the same per-machine packet produces the structured quote that keeps repeat Komatsu work simple.
The Korean platform overlap with Doosan and Kobelco is covered in the platform guide.
KTSU Expert Views
Prebuilt Komatsu kits cut quoting time and order errors for dealers. In our cross-reference work, the Komatsu order that goes wrong is the one built on a model name and a guessed prefix — the 20T family ordered where the machine carries the 20Y, or a part number superseded across generations. The prefix names the family, the serial range names the generation, and the dimensions confirm the match. When a dealer sends a fleet list with prefix families noted, we can bundle the repeat parts into kits and quote the whole list in one pass. Kits turn repeat Komatsu work into a one-line order — the prefix system is what makes the bundling reliable.
- KTSU Application Engineering Team
Conclusion
Kits turn repeat Komatsu work into a one-line order. Read the prefix, confirm the serial range, verify the dimensions, and order by fleet list — the prefix system is the key to the whole process.
Key Takeaways
- Komatsu prefixes — 20T, 20Y — identify component families, not decoration.
- Map the PC series by class and confirm the exact part by serial range.
- Verify the prefix family against the machine before ordering.
- Order fleets by machine list so repeat parts bundle into kits.
- Compare prefix, class, serial range, and dimensions together.
Questions to Ask
- What prefix family does this machine's undercarriage carry — 20T or 20Y?
- What is the machine's serial range, and which PC generation is it?
- What number is stamped on the old part, and does the cross-reference match?
- Do the dimensions agree with the listing's specs?
- Is the fleet ordered by machine list so repeat parts bundle into kits?
Get Komatsu-compatible parts by prefix or machine model — send the fleet list with serial ranges for a kit quote.
Frequently Asked Questions
What do Komatsu part number prefixes mean?
The prefix groups the part into a component family — 20T and 20Y are the roller families most buyers meet. The rest of the number refines the specific part within the family.
Which Komatsu parts fit my PC200?
The parts matching your PC200's serial range and prefix family. The 20Y-30-00481 carrier roller is one PC200-family example; the serial range decides the exact set.
Where can I cross-reference Komatsu parts?
On listings that state the OEM cross-reference and the specs together, with the machine's serial range. The prefix family and the dimensions confirm the match before the order.
Are 20T and 20Y parts interchangeable?
No — the two prefixes identify different roller families with different fitments. Ordering across the families is a common Komatsu error that the serial range and dimensions prevent.
Why did my Komatsu part number change?
Komatsu superseded part numbers across generations. The current number is usually one migration away, and the serial range confirms which version the machine carries.