The wear bill you can actually control
Undercarriage is the single largest running cost on a tracked machine, and most owners never see it coming. It does not fail on a Tuesday the way a hose does. It grinds away quietly for two thousand hours and then presents the whole bill at once.
- Open 24 hours, seven days
- No hourly minimum
- Wear measured, not eyeballed
- Rubber and steel track
Nobody budgets for it until the invoice lands
Ask an owner what a tracked machine costs to run and you will hear fuel, then oil and filters, then maybe a hydraulic repair they remember because it ruined a week. Undercarriage rarely comes up. On most excavators and dozers it quietly outspends every one of those categories over the life of the machine, because when it finally gets replaced it gets replaced as a set: chains, sprockets, idlers, rollers, sometimes the track frames themselves.
What makes that painful is how avoidable a good share of it is. Undercarriage does not wear at a fixed rate set by the factory. It wears at a rate set by how the machine is run, what it is run on, and whether anyone has touched the tension in the last year. Two identical excavators bought the same month can be four hundred hours apart on chain life, and the difference is almost never the machine.
That is the part worth acting on. Nobody can stop steel from wearing against steel. Anyone can stop a machine from running a hundred hours with tracks cranked twenty percent too tight, which is the most common and most expensive habit we find when we get under one of these.
Machines this coversExcavators and mini excavators, dozers, compact track loaders and tracked carriers, on both rubber and steel track, plus the roller and idler work that goes with them.
What the job runsYou get a price before work starts that covers the trip and the labor together. No hourly minimum, so a tension adjustment is billed as a tension adjustment.
ReachNapa and Solano first, then wherever the I-80 and Highway 12 corridors lead, with Sonoma, Contra Costa and Alameda in range when the call makes sense. See which counties we cover.
Track tension is the cheapest hour you will ever spend
If there is one thing on this page worth acting on this week, it is tension. A track that is too tight loads every pin, bushing, sprocket tooth and roller flange with force the machine was never designed to carry, all day, whether it is digging or idling. The wear rate climbs sharply and it climbs everywhere at once. A track that is too loose slaps, derails on side slopes, and hammers the idler and sprocket at the exact moment it jumps.
Correct tension is not a feel thing and it is not the same number on every machine. It is a measured sag over a specified span, checked with the machine sitting on ground that matches the material it works in, and it changes as packed mud dries or falls out. A machine tensioned in clay and then run on dry rock is running tighter than the gauge said an hour ago.
We check it, we set it to the manufacturer’s spec for that model, and we tell you what it was before we touched it. That last part matters, because if it was badly out, that tells you something about the wear you are already carrying and what the next inspection is likely to show.
Measured wear turns a guess into a decision. Once you know a chain is at sixty percent, you can plan the replacement around your schedule instead of around a breakdown.
How we approach undercarriage
What actually gets done under there
These parts wear as a system. A dry or seized roller drags a chain sideways, that chain eats a sprocket, and the sprocket then chews the replacement chain. Catching one part early usually saves two others.
Track repair and replacement
Broken chains rejoined with a master link where the rest of the chain has life left, full replacement where it does not. Rubber track swapped on site.
Tension adjustment
Grease-cylinder tensioners checked, adjusted and inspected for leaks, because a tensioner that will not hold grease makes correct tension impossible.
Sprocket replacement
Hooked or pointed teeth mean the drive is no longer meshing cleanly. Replaced with the chain wherever the wear numbers say they belong together.
Idler and roller work
Seized, leaking or flat-spotted rollers and front idlers swapped out, including the alignment check that explains why one side wore faster.
Wear inspection on a schedule
Measured at intervals so the trend is visible. Two readings a few hundred hours apart predict a replacement date better than any single look.
Final drive checks
The drive sits right there in the same teardown, so oil level and metal content get checked while the sprocket is off.
Your ground sets the wear rate, not the brochure
Abrasive material is the first factor. Sand, crushed rock, decomposed granite and recycled concrete all act like a grinding compound packed into every pin and bushing. A machine that lives in those materials can burn through an undercarriage in a fraction of the hours the same machine would get moving topsoil, and no amount of careful operating fully cancels that out.
Side-slope work is the second. Running across a grade day after day pushes the chain against one side of the roller flanges and the idler, so one rail wears visibly faster than the other. When we find lopsided wear, the fix is usually about how the machine is being worked rather than any part being defective, and knowing that saves you replacing parts that were never the problem.
Then there are the habits: spinning the tracks for traction, turning hard on one track instead of making a wider counter-rotation, traveling long distances at full speed, climbing on and off transport at an angle. Each one is small. Together they separate a machine that needs undercarriage at four thousand hours from one that needs it at two thousand five hundred.
We will point out what your wear pattern is telling us. Sometimes the useful answer is a repair. Sometimes it is that a particular operator is turning the machine in a way that will cost you a chain next year, and that is worth a conversation before it is worth a part.
Questions owners ask about track wear
If a track is already off or a machine is stuck, the phone is faster than reading. Someone picks up at any hour.
How often should track tension be checked?
Monthly on a machine in regular use, and any time it changes working material. Tension is measured with the undercarriage in the same condition it works in, because packed mud that dries and falls out will leave a track loose that read correct two days earlier. It takes very little time and it is the cheapest thing anyone can do to extend undercarriage life.
Can you tell how much life is left without pulling it apart?
Yes, for most of it. Bushing and link height, sprocket tooth profile, roller and idler flange wear and chain pitch can all be measured with the undercarriage assembled, and they are reported as a percentage of usable wear. That gives you a plan with a date on it rather than a warning that something looks worn.
Do sprockets have to be replaced with the chain?
Not always, but often. Sprockets and chains wear against each other as a matched pair, so a worn sprocket driving a new chain will hook the new chain’s bushings early and take life out of a part you just paid for. We measure both and tell you which combination makes sense, instead of automatically selling the whole set.
Is rubber track repairable or does it always get replaced?
Minor damage to a lug can sometimes be left alone, but once the internal steel cables are exposed or broken, the track is finished and no repair changes that. Chunking at the lugs, cracking between them and exposed cable are the signals to watch. Rubber track usually gets replaced rather than repaired, and it can be changed on site.
Can undercarriage work be done at my yard or on the job?
Most of it, yes. Tension adjustment, roller and idler replacement, sprocket changes and track repair are field work when the machine can be blocked safely and there is room to work beside it. Firm level ground makes it faster. A machine buried in soft fill or sitting on a grade has to be dealt with before anything comes apart.
What does a track job cost?
You hear a price before work starts, covering the trip and the labor in one figure, and parts are quoted once we know the model and what the measurements say. There is no hourly minimum and nothing gets added afterward. Patrick started this business because he watched too many people get told one number and handed another.
Track off? Call before it gets worse.
A derailed track that gets forced back on without checking why it came off usually comes off again, with more damage the second time. Tell us the machine, whether it is rubber or steel, and where it is sitting, and you will have a plan and a number before the call is over.
HoursMonday to Sunday, 24 hours
Based inAmerican Canyon, CA
Related workExcavator repair · Skid steer repair · Dozer repair · Gallery