Komatsu PC45MR-3 Rubber Tracks & Parts

Replacement rubber tracks for the Komatsu PC45MR-3 mini excavator in 400x72.5Nx74 — 400 mm wide, 72.5 mm pitch, 74 links. Built for digging, trenching, backfill and tight-quarters work, with free freight to the lower 48.

What the numbers mean on a Komatsu PC45MR-3

400x72.5Nx74 — 400 mm tread width (about 16"), 72.5 mm pitch, 74 links, narrow guide lugs

Width is the tread face, pitch is the distance between drive lugs, and links is the count around the loop. All three have to match — a track one link off will not tension correctly no matter how close the width is.

Tread choice for the Komatsu PC45MR-3

Size gets the track on the machine; tread decides how it works and how long it lasts. What we stock for this one:

All-Terrain — everything in between. A compromise tread when the machine moves between surfaces

Komatsu PC45MR-3 at a glance

Operating weight — 10,494 lb

Undercarriage parts for the Komatsu PC45MR-3

Rollers, idlers and sprockets wear on the same clock as the track. Fitting new rubber over a hooked sprocket or a seized roller is the fastest way to lose the new track — check these while the tracks are off:

Drive sprocket — 2054978
Front idler — 9237507
Bottom roller — 9239528
Carrier roller — 9239529

How these wear

Excavator undercarriages load one side hard on slew and travel, so link cracking usually shows up before the tread wears out. Replace in pairs where you can: a new track running against a stretched one loads the drive unevenly and you will feel it in the steering.

Same track, other machines

Track size follows undercarriage geometry, not brand, so 400x72.5Nx74 shows up on machines from several makers. If you run any of these alongside the Komatsu PC45MR-3, it is the same belt:

Not sure which you are running? Read the size off the inside of the old track, or call (850) 816-7898 and we will pull it off the machine record. The Track Finder works by make and model too.

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Track sizes

Heavy-Duty Rubber Tracks for PC45MR-3

Komatsu PC45MR-3 400x72.5Nx74 All-Terrain
- Heavy Duty | 400x72.5Nx74
- All-Terrain Grip
- Smooth Ride
- Cut Resistant
$1,696.50$1,631.25
In stock

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Komatsu PC45MR-3 400x72.5Nx74
- Bridgestone | 400x72.5Nx74
$2,429.00$2,109.00
In stock

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Which tread fits Komatsu PC45MR-3?

Pick a tread for your jobsite — then buy above.

+ Recommended surface- Not the primary use— Application dependent

Pattern	Best Use	Key Traits	Road	Clay	Gravel	Mulch	Mud	Turf	Action
All-TerrainHard-surface control	Precision machine control, easy turning, and extended life on hard surfaces. Preferred by asphalt and concrete contractors working on road and gravel.	Precision Machine Control Easy Turning Extended Life	+	-	+	-	-	-	View

100% Virgin Rubber
Engineered to resist chunking, tearing, and cutting in harsh, abrasive environments.
Continuous Steel Cords
Jointless internal cable architecture eliminates structural weak points and maximizes overall tensile strength.
Drop-Forged Links
Precision heat-treated guide lugs ensure exact sprocket engagement and prevent de-tracking under heavy side-loads.
Corrosion Resistant
The internal steel framework is fully encapsulated to prevent oxidation, rust, and moisture penetration.
Reinforced Sidewalls
Extra-thick vulcanized rubber and tapered edge profiles protect against curb slashing and lateral impacts from jobsite debris.
Low-Vibration Tread
Optimized lug spacing and pitch geometry absorb shock, reducing undercarriage wear and minimizing cabin vibration.