Description
You know that moment when your PC78 just doesn’t want to move like it used to? One track lags, the machine feels sluggish, and you’re pressing the travel lever a little harder every time. That’s usually the final drive telling you it’s done.
This part—Komatsu’s 21W-60-41201—is the same size and spec the machine rolled out of the factory with. It’s a full travel motor and gearbox together, so you swap the whole unit and forget about matching internals. I’ve seen them go straight into a PC78MR-6 and be working within the hour, no fussing over shims or custom fittings.
It’s not light—about 82 kilos—but that weight is all gears, bearings, and housing that can take a beating. The seals keep the mud and grit out, which matters if you’re running the machine in wet ground or dusty demo sites. Once it’s in, travel speed comes back, the noise drops, and you can push into a pile without the machine bogging down.
Why Choose Us
We supply genuine and premium-quality replacement parts for Caterpillar, Perkins, and Komatsu engines, along with other heavy equipment parts. With competitive pricing, fast shipping, and reliable after-sales support, we are your trusted partner for keeping your machines running at peak performance
For anyone running a PC78UU-6, PC78US-6, or PC78MR-6, this is the direct drop-in. Unbolt the old, bolt on the new, hook up the lines, and get back to work.