Skid steer and compact track loader undercarriages carry a different load than excavator tracks: the machine is driven hard in turns, and the track and roller system absorbs scrub that an excavator never sees. Buying the right parts means matching the loader family, the track system, and the wear pattern to the machine. On an Alberta rental or construction loader, the undercarriage is the highest-wear system on the machine.
Related reading: for CTL rubber tracks, see our CTL track guide, and for loader carrier rollers, see our loader carrier roller guide.
How Loader Undercarriages Differ
A CTL runs a rubber track over a steel undercarriage much like a compact excavator, but the duty is different: loaders carry weight forward, turn hard under load, and work on concrete and gravel as often as dirt. The turning scrub is the difference that wears tracks and rollers faster.
Skid steers that run tires and CTLs that run tracks need different parts and different planning. The track system adds rollers, idlers, sprockets, and the undercarriage frame to the parts list, and each position is matched to the loader model.
A skid steer and a compact track loader are not fitted with the same undercarriage parts: the track system, rollers, and idlers are matched to each machine's drive and weight, and the parts book for the serial number decides the fit.
| Loader system | Parts involved | Main wear driver |
|---|---|---|
| Tire-based skid steer | Axles, wheels, tires | Tire wear, no track loop |
| CTL rubber track | Track, rollers, idler, sprocket | Turning scrub and abrasive ground |
Rubber Track Systems for CTLs: Sizes, Pitch, and Tread
CTL tracks are sized by width, pitch, and link count, and the loader serial number settles the fit. Loader tracks run wider than excavator tracks on similar-weight machines because the loader carries the load in front of the track footprint.
Confirm the track size against the model and generation, and read the old track's size code before removal. A loader track that is correct in width but wrong in pitch will skip on the drive and wear the sprocket.
Loader tracks also carry the machine's working weight through the turn, which is why the tread pattern matters as much as the size. A pattern that clears mud keeps grip in soft conditions, while a harder compound resists the abrasive wear of concrete and gravel work — the pattern and compound should follow the loader's dominant job.
Rollers, Idlers, and Sprockets for Loaders
The steel undercarriage of a CTL includes bottom rollers, carrier rollers, the front idler, and the drive sprocket. Loader rollers carry higher loads per position than excavator rollers because the weight is concentrated under the machine.
Identify each part by position and part number, and inspect for the loader-specific wear pattern: flats from hard turning, flange wear from debris, and weeping seals from scrub loads. Replace the worn positions with the track change where the wear cycle matches.
When to Replace Loader Tracks: Lug Wear and Cut Limits
Loader tracks are replaced when lug depth or the track body reaches the wear limit, or when cuts and cord exposure make further running a risk. Turning scrub wears the outside edge and the drive lugs first.
Measure the track at every service and record the reading with the hours. The trend tells you when the track and the steel parts should be ordered together, which keeps the loader's downtime to one stop.
Full Undercarriage Options for Loaders
Some loader owners replace the complete undercarriage — track, rollers, idler, sprocket, and hardware — in one planned refresh. The option makes sense when the wear readings show several parts near the limit at the same time.
Order the full set against the loader serial number, confirm the fitment and the delivery window in writing, and schedule the change around the loader's idle period. One refresh event costs less than three emergency repairs.
The full-set decision starts with the readings, not the calendar: when the track, rollers, and sprocket all sit near their limits, replacing the set in one stop saves the labour of a second teardown. When only the track is worn, the single-part replacement is the cheaper call — the readings decide which case the machine is in.
Parts Planning for Loader Fleets: Standardize, Read, and Schedule
A loader fleet plans the undercarriage like a budget line: track and roller readings per machine, a spares kit for the common positions, and a single supplier for consistent fitment. The plan turns wear from a surprise into a schedule.
For an Alberta fleet, the standardize-first rule keeps the plan simple: run the same track and roller families across the fleet where the models allow, and order the common parts against the fleet's serial numbers.
See the Rubber Track collection and the Carrier Roller collection for your loader.
Conclusion
Loader undercarriages wear from turning scrub and abrasive ground, and the parts plan has to match: track, rollers, idler, sprocket, and hardware read together and ordered against the serial number. Standardize the fleet, keep the readings on schedule, and the undercarriage stops being the loader's biggest surprise.
Key Takeaways for Canadian Operators
- Read loader track wear from turning scrub, not excavator patterns.
- Confirm track size, pitch, and link count against the loader serial number.
- Order rollers, idler, and sprocket with the track when readings align.
- Standardize parts families across the fleet for one-stop planning.
Frequently Asked Questions
Do CTLs use the same undercarriage parts as excavators?
No. Loader undercarriages carry different loads and turn harder than excavator tracks. Match every part by loader serial number and part number.
Why do CTL tracks wear on the outside edge?
Turning scrub is the main driver: the outside edge and drive lugs take the load when the loader turns under weight.
Can I replace CTL rollers without replacing the track?
Yes, when the track is healthy. If the track is near the limit too, replace the set together to avoid a second stop.