A compact track loader comes back from rental pulling hard to the left. The final drive looks like the obvious cause, and swapping it seems like the fastest way to get the unit back on rent.
Sometimes that's the right call. But a new or reman final drive won't fix a weak charge pump, a clogged case drain line, a dragging parking brake, or a stuck two-speed valve. If the real cause is somewhere else, you've spent the money, the machine is still down, and the new drive may be damaged by the same problem.
Here's how rental fleet technicians can narrow down the cause before ordering parts. For a deeper look at symptoms, see our final drive diagnosis guide.
⚙️ Key Takeaways
- Diagnose before replacing
- Start by determining whether one side or both sides are affected
- Check case drain restrictions, gear oil condition, brake release, two-speed operation, and case drain flow before condemning the drive.
- Finding and correcting the root cause helps rental fleets avoid unnecessary parts costs, repeat downtime, and damage to replacement drives.
