Where to Buy Komatsu PC45MR Tracks Online in Canada at the Best Price?

The size to start from is 400x72.5Nx74: that is the track this catalogue lists for the Komatsu PC45MR-3, alongside the PC40MR-2 and PC50FR-2. Everything else about buying a PC45MR track - the supplier, the price, the delivery time - matters only after that code is confirmed, because the width, the pitch and the link count are the fitment, and the badge on the box is not.

Last updated: October 5, 2026

This guide covers what the PC45MR's tracks do, how to read the size code and confirm it on your machine, how the tread and compound choices change performance, what to confirm before buying online in Canada, and what to inspect while the tracks are off.

What the tracks do for the machine

Rubber tracks on a compact excavator like the PC45MR are continuous belts that carry the machine's weight, provide traction and absorb shock. Their real value is in how they spread load: a belt distributes the machine's mass across a long contact patch, so ground pressure stays low and the machine does not sink into soft ground, compact soil or crack a finished surface. They also stabilise the machine while it digs and lifts, because a wide contact patch resists tipping in a way that wheels or a narrower footprint cannot.

The trade is that the belt is a wear part with predictable failure modes: abrasion from abrasive ground, cuts from sharp debris, and the tension and alignment discipline the operator brings to it. Most of what decides whether a set reaches its design life sits in those three, not in the brand on the sidewall.

Reading the size code, and confirming it

A track size is written as width × pitch × link count, with a note for the lug pattern. So 400x72.5Nx74 is a 400 mm belt on a 72.5 mm pitch with 74 links, in an N-pattern tread. Each number has a job: width sets ground pressure and flotation; pitch has to engage the drive sprocket and cannot be adjusted; link count is the belt's length, and a track one link short will not tension correctly.

Three sources confirm what your machine takes, in order of reliability: the marking moulded into the track you are removing; the parts book or service manual for your series; and the serial number plate, which is what a supplier needs to cross-reference a part number, because undercarriage specification changes across build series. Where the marking and the book disagree, believe the marking - it is the belt actually running on the machine.

Tread and compound: the choice that changes the outcome

Two belts of the same size can behave very differently, because the tread and the compound are chosen for the ground.

An open, deeper lug pattern clears mud and grips in soft or loose material; the channels between the lugs matter as much as the lugs themselves, because a packed track loses grip and starts cutting its own tread. A smoother profile leaves less mark on turf and pavement and runs cooler on hard surfaces, which is what a machine working around driveways and finished ground wants. Where the machine works both - which is most compact excavator work - the multi-purpose pattern is the sensible compromise rather than the most aggressive tread available.

Compound follows the same logic in the other direction. Abrasion resistance and cold flexibility pull against each other, so a belt built to survive broken concrete is not the belt to buy for lawn work, and a belt formulated for a mild climate is a different product from one rated for frost. In Canada the compound's published temperature band is a specification worth asking for, not a detail.

What to confirm before buying online in Canada

Buying tracks online is normal now, but only when the listing behaves like a parts counter. Four items belong in writing: the part-number cross-reference naming your machine, model and serial number against the belt; the specification as supplied - cord construction and insert count, tread as ordered, compound; the warranty terms as a period plus an operating-hours cap, whichever comes first, with freight responsibility named; and the stock position with a delivery date, because a machine waiting on a track is the most expensive part of the job.

Then compare total landed cost rather than the unit price. A track is bulky and heavy, so freight and duty can be a meaningful share of the invoice, and a domestic supplier with stock on the shelf will often beat a cheaper one that ships from overseas once the days the machine stands are counted.

What else to check while the tracks are off

A track is one part of an assembly, and the parts around it decide whether a new set lasts. While the belts are off, inspect the sprocket teeth for hooks or rounding - a hooked tooth climbs the links and stretches a new belt - and the idler face and every roller for flat spots, free play and weeping seals. Check the belt's inner surface for damage caused by a seized roller, and check alignment, because the track is what carries the wear from anything out of line.

Two habits make the whole picture clearer. Set tension to the figure in the manual, measured the manual's way, on both sides, and re-check after the first weeks while a new belt beds in. And keep the hours, terrain and size of each set on file: after two sets, your own record beats any published estimate of how long a PC45MR track should last, and it turns the next purchase into a comparison rather than a guess. Where the machine's work involves different ground from one year to the next, the material question is worth revisiting too, as matching track material to conditions explains, and the same buying framework travels across brands - the approach in sourcing Hitachi EX30 tracks in Canada applies to a Komatsu machine without change.

This article is part of the rubber tracks guide, which covers how the size code works, tread patterns, compounds and buying a set in Canada.

FAQs

What size tracks does a Komatsu PC45MR take?

This catalogue lists the PC45MR-3 on a 400x72.5Nx74 belt, shared with the PC40MR-2 and PC50FR-2. Confirm the width, pitch and link count from the track you are removing and have the part number cross-referenced against your serial number.

Are rubber or steel tracks better for a PC45MR?

Rubber for finished surfaces, landscaping, utility work and anything the machine has to cross without marking; steel for rock, quarry and demolition work where cuts would destroy a rubber belt. Most compact excavators in Canada work in the first set of conditions.

How long should these tracks last?

It depends on ground, tension and the condition of the rollers and sprocket underneath, so your own hours record is the useful reference. Keep the hours, terrain and size for each set and after two sets you will know your machine's expected life.

Can I buy tracks online safely?

Yes, when the seller will state the part-number cross-reference, the cord construction and tread as supplied, and the warranty terms with freight responsibility. Without those, the listing is a photograph and the price is the only information you have.

Should both tracks be replaced at once?

If both have run the same hours on the same ground, yes - the machine otherwise steers against the older belt and wears the new one faster. A single replacement is reasonable when one belt has been damaged early on an otherwise sound set.