Komatsu PC78USLC-6 tracks and undercarriage, sized 450x83.5x74 (450 mm wide × 83.5 mm pitch × 74 links). Made for digging, trenching, backfill and tight-quarters work. Free freight, 24-month warranty.
What the numbers mean on a Komatsu PC78USLC-6
- 450x83.5x74 — 450 mm tread width (about 18"), 83.5 mm pitch, 74 links
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 PC78USLC-6
Size gets the track on the machine; tread decides how it works and how long it lasts. What we stock for this one:
- Directional — digging, trenching and slope work. The standard excavator tread
Undercarriage parts for the Komatsu PC78USLC-6
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:
- Bottom roller — KM1690
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 450x83.5x74 shows up on machines from several makers. If you run any of these alongside the Komatsu PC78USLC-6, it is the same belt:
- Bobcat E88
- Komatsu PC60-6
- Komatsu PC70FR-1
- Komatsu PC75-1
- Komatsu PC75-2
- Komatsu PC75-6
- Komatsu PC75UU
- Komatsu PC75UU-1
- Komatsu PC75UU-2
- Komatsu PC75UU-3
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.
