Komatsu's PC-series excavators share undercarriage parts across model families, which makes the buying guide a commonality map: identify the family, confirm the part number, and check the part-sharing across models. The PC-series guide covers rollers, idlers, sprockets, and shoes, with the serial-number parts book as the authority. For a British Columbia fleet running PC machines, the shared parts list is the planning tool.
Related reading: for PC200 rollers, see our PC200 roller guide, for PC300/PC400 shoes, see our PC300/PC400 shoe guide, and for KM repair kits, see our repair kit cross-reference guide.
*Brand names and OEM part numbers are used for identification and cross-reference only. AFT Parts is an independent aftermarket supplier unless otherwise stated.*
PC-Series Families and Part Commonality: Drawing the Fleet Map
The PC-series spans compact to large excavators, and parts are shared within families: the PC200 class shares roller and idler families across related models, and the PC300/PC400 class shares across its own group. The sharing is what makes a fleet parts list compact.
The commonality is a planning advantage, but it is confirmed per serial number. The model name narrows the family, and the serial number settles the exact part.
The commonality map is worth drawing for a fleet: the parts that cross multiple PC models go on the shared spares list, and the parts that are model-specific stay on the per-machine record. The map is what turns a mixed PC fleet into one manageable parts inventory.
Track Rollers and Carrier Rollers for PC Machines
PC bottom rollers are matched by diameter, width, flange style, and mounting, and the position in the undercarriage sets the part. Carrier rollers on the top run are matched separately, with their own flange and bracket specifications.
Identify the roller by the old part number and the position, and confirm the set against the serial number. A PC roller set ordered as a set arrives with the positions matched.
The roller position matters because the load varies across the undercarriage: the front and rear positions carry the turning load, while the middle positions carry the weight in straight travel. A roller ordered by position and part number seats correctly, and a roller ordered by size alone may be the right part for the wrong place.
The carrier rollers follow the same rule: the top-run rollers are matched by bracket and flange, and they are inspected for the speed-related wear that travel puts on the upper run. Listing the carrier positions on the same order sheet as the bottom rollers keeps the set complete and the fitment confirmed in one check.
Matching Idlers, Sprockets, and Shoes for PC-Class Excavator Machines
The PC front idler and drive sprocket complete the loop, and the PC300/PC400 class uses shoe widths and bar designs matched to the generation. The idler sets the front line, the sprocket drives the chain, and the shoes carry the ground load.
Confirm each part against the serial-number parts book, because generation changes moved the configurations. The parts that shared across one family may not cross to the next.
Reading Komatsu Part Numbers
Komatsu part numbers carry the family and configuration in their structure, and the number is read from the part or the parts book. Photograph the old part number before removal and cross-reference it with the supplier.
Match the part number against the serial-number parts book; the two together are what make the fitment confirmation real. When they agree, the fit is confirmed.
The photograph matters because Komatsu numbers are stamped into the part and can be worn or painted over by service. A photo taken before removal captures the number the parts book can match, and it saves the measuring and cross-referencing that a missing number forces.
The photo also documents the position and the mounting, which the supplier can read alongside the number. Sending the photo with the order gives the fitment check two independent inputs, and the confirmation comes back faster.
Aftermarket Quality for Komatsu Machines: Check the Full Specification
Quality aftermarket Komatsu parts match the OEM specification: dimensions, material, hardness, and bolt pattern. Compare the documented spec and the warranty, and confirm the fitment against the serial number before dispatch.
For a BC fleet, the aftermarket case is strongest where the OEM number is established and the machine is out of warranty. The written comparison is the buying record.
The quality question is answered in the documentation, not the price: material grade, heat treatment or hardness range, and the intended duty, confirmed in writing with the order. A Komatsu part that matches the number but not the spec is a lookalike, and the spec sheet is what separates it from the replacement.
Building a Komatsu Spares List
The Komatsu spares list follows the part commonality: the shared rollers, idlers, and shoes that fit across the fleet's PC families. The list is built from the serial numbers and the wear log, and it is reordered on the wear cycle.
| Komatsu fitment field | What it settles |
|---|---|
| PC model family and generation | The parts family |
| Machine serial number | The exact configuration |
| Old part number, photographed | The component cross-reference |
| Position in the undercarriage | The right part for the position |
| Shared-part confirmation | The fleet spares list |
Questions to Ask Before You Order
- Which PC family and generation does my serial number identify?
- What are the roller, idler, sprocket, and shoe part numbers?
- Which parts are shared across my fleet's PC machines?
Frequently Asked Questions
Do Komatsu PC200 and PC300 share undercarriage parts?
Some parts are shared within a class, but not across classes. The serial-number parts book settles which parts cross between models.
How do I read a Komatsu undercarriage part number?
The number identifies the family and configuration. Read it from the part or the parts book, photograph it, and cross-reference it with the supplier.
Are aftermarket Komatsu parts reliable?
Quality aftermarket parts match the OEM specification. Compare the documented spec and warranty in writing before ordering.