Where to Buy Kobelco SK25SR Parts Online in Canada?

A Kobelco SK25SR rarely stops because one part failed. It stops because a roller seal started weeping weeks earlier and nobody looked: the roller seizes, the track runs slack against the sprocket, and a part that costs little takes a belt that costs plenty with it. Ordering parts is the easy half; knowing which parts are about to fail is the half that decides the bill.

Last updated: October 5, 2026

This guide covers the parts that make up the undercarriage and what each does, how to read the wear that tells you which one is due, how to judge a supplier online in Canada, and what to have in writing before you pay.

The parts, and what each one does

Five components carry the machine, and knowing their jobs is what makes a parts list readable.

Rubber tracks provide ground contact, traction and shock absorption, and they are the part you see - which is why they are also the first part blamed for problems that started elsewhere. Track rollers (bottom rollers) carry the machine's weight on the belt and guide it as the machine moves. Carrier rollers (top rollers) hold the upper run of the track so it does not sag onto the frame. Idlers keep the track tight and aligned as it runs around the front of the undercarriage. Sprockets engage the track links and turn the drive torque into movement.

Each of them wears against the others, so a replacement is rarely the end of the job. That is the single most useful thing to understand about undercarriage parts on a compact excavator.

How to read what is wearing

The undercarriage tells you which part is due before it fails, if you know what to look at.

Oil or grease weeping onto the undercarriage after the machine has stood means a roller or idler seal has gone. A sealed bearing cannot be re-greased in service, so this is a replace-now symptom rather than a watch-it one. A thump or flat spot at walking pace means a roller has stopped turning and is transferring its load into the belt and frame. A track that will not hold tension, or slaps the frame points at the idler, the tensioner or the frame rather than at the belt. Track skipping under load points at the sprocket: teeth that have hooked climb the links instead of seating in them. And wear concentrated on one side of a roller or one edge of the belt means alignment - which is a correction, not a part.

Two habits turn those readings into a plan. Check the parts on the same walk-round as track tension, because the two take the same few minutes. And record the hours when a set of parts goes on, so the second replacement is a calculation rather than a guess.

When to replace rather than repair

Three rules cover most decisions. Replace a sealed roller or idler at the first sign of a weep, because there is nothing to service inside it. Replace a sprocket in the same job as the track where either is worn, because a new belt on hooked teeth is shortened life on your most expensive part, and a new sprocket on a stretched belt leaves the same mismatch in the other direction. And never weld a cracked idler frame or roller housing: heat distorts the part and the alignment it holds, so the failure simply moves to the belt.

Where one part has failed on a side whose components have all run the same hours on the same ground, plan the set: doing the work once, with the track off and the tension released, costs less than repeating the labour three times.

Buying online in Canada

Buying these parts online is normal now, but only when the listing behaves like a parts counter rather than a shop window. Four things separate the two.

A part-number cross-reference to your machine. A listing that names a model family without a number is not a fitment - it is an invitation to guess. The specification as supplied: bearing type and seal design for rollers and idlers, material and treatment for sprockets, cord construction and tread for tracks. Warranty terms as a period plus an operating-hours cap, whichever comes first, with freight responsibility named for a claim. And stock position with a delivery date, because a machine waiting on a part is the most expensive part of the job.

On the OEM-or-aftermarket question, both routes are legitimate. A dealer supplies the factory part with the factory's backing; a specialist supplies an equivalent fitment with shorter lead times and usually better availability of the parts around it - which matters on an undercarriage, where one failure is often the first of two. An example of the idler class in this catalogue is this front idler PV52D00013F1 for Kobelco and New Holland machines, listed by part number and machine rather than by a promise. Where the question is whether a part is genuine or a compatible equivalent, the fair test is the same one: what makes a Kobelco part worth choosing is the documentation behind it, not the label on the box.

The full range sits in the AFT Parts catalogue, where parts are grouped by machine and part number - the way you need to read them when the machine is down.

Maintenance that pays for itself

Four routines protect an undercarriage on a machine this size. Clean the tracks and rollers after abrasive work, because packed material wears the belt and the frame and holds moisture against seals. Check track tension against the manual's figure, measured the manual's way, on both sides. Inspect rollers, idler and sprocket on a schedule rather than on a hunch. And correct alignment whenever a part is replaced, because an idler or roller out of line wears a new belt in the same pattern as the old one.

This article is part of our excavator undercarriage parts guide, which covers the five wear components, the order they fail in and how to confirm fitment.

FAQs

What parts make up the Kobelco SK25SR undercarriage?

Rubber tracks, bottom track rollers, top carrier rollers, the front idler and the drive sprocket - plus the tensioner that holds the track's tension. Each is available individually, and they wear against each other.

How do I know when undercarriage parts need replacing?

Cracks or chunking in the belt, a track that will not hold tension, flat spots when you turn a roller by hand, oil or grease weeping at a seal, and track skipping under load. The first sign of a seal weep is a replace-now symptom.

Which Kobelco models do these parts cover?

Parts are listed by machine and part number rather than by family, and the SK25SR series has changed across its production. Cross-reference the number against your machine's model and serial number before ordering.

How do I tell a genuine part from a compatible one?

By the documentation: a part-number cross-reference, the specification as supplied, material traceability where it applies, and written warranty terms. Markings and fit are useful checks, but paperwork is what settles the question.

Can I mix OEM and aftermarket parts on the same undercarriage?

You can, provided both meet the same specification - but expect the newer part to do more than its share of the work against a worn neighbour. Where one side of the undercarriage is being renewed, doing the set together usually costs less than returning to it.