Track chain wear happens on two surfaces: outside, where the bushing rides the sprocket tooth, and inside, where the pin turns in the bushing. The outside wears first because it carries the sprocket load, and as the bushing's outer diameter falls the chain's pitch grows and the sprocket starts climbing the teeth. Turning pins and bushings 180 degrees puts the unworn half of each surface into service, restores pitch and buys a substantial part of the chain's remaining life for the cost of labor and seals. It pays when the bushing outside is worn and the internal clearance is still within limits. It is wasted money on a chain already past its pitch limit, or on a sealed chain whose joints are seized.
What you will notice
| Symptom | What it usually points to |
|---|---|
| Pitch measured over ten links is close to the limit | The chain has stretched, and most of that stretch is bushing wear on the sprocket side. This is the window where a turn is worth doing, and it closes quickly. |
| Flat worn faces on the bushings where the sprocket contacts them | Exactly the wear a turn addresses. The opposite face of the same bushing is still round and unworn. |
| Sprocket teeth hooked or sharpened to a point | The chain is climbing worn teeth. A worn sprocket accelerates bushing wear, so chain and sprocket are one decision rather than two. |
| Snatch and rattle at the sprocket under load | Pitch no longer matches tooth spacing. Turning the pins and bushings restores the match without a new chain. |
Measurement to decision
| What you measure | What to do |
|---|---|
| Pitch under the limit, bushing worn outside | Turn the pins and bushings. Best value in the chain's life. |
| Pitch at or past the limit | Replace the chain. Turning a worn-out chain only moves the wear. |
| Pin-to-bushing clearance at the limit | Internal wear is finished. A turn buys little; plan a chain. |
| Sprocket teeth hooked or sharp | Sprocket in the same job, or the new chain wears to match it. |
| Seals damaged or joints seized | Joint rebuild or a link assembly, not a turn. |
How to confirm it
- Measure pitch over ten links against the limit
With the chain clean and correctly tensioned, measure pin center to pin center across ten links and divide for the average. Compare with the manual's wear limit: past it the chain is scrap and a turn is wasted labor. Under it, the turn is worth pricing.
- Measure the bushing outside and the internal clearance
The bushing's outer diameter says how much has worn on the sprocket side. Pin-to-bushing clearance says how much life is left inside. A turn is right when the outside is worn and the inside is not, which is the common case at mid-life.
- Decide the sprocket in the same conversation
A turned or new chain on a hooked sprocket wears to match it within a few hundred hours. If the teeth are past their limit, the sprocket goes in the same job or the money spent on the chain is partly wasted.
- Press out, rotate and press back with new seals
Each pin and bushing is pressed out, turned 180 degrees and pressed back. Sealed chains get new seals and fresh grease at every joint, because a joint that goes back dry is the one that fails first and takes the chain with it.
- Set tension by the manual's method and recheck
New seals and repositioned joints settle in the first shift. Set the sag at the specified measuring point, recheck after the first shift and again around fifty hours, and record both readings.
What to do about it
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Parts you may need, by grade
| Part | Grades commonly quoted |
|---|---|
| Pins and bushings | Genuine or OEM-quality to the chain pitch and series. Hardness is the whole product, and a soft bushing turns the sprocket into a milling cutter. |
| Joint seals and grease | Genuine or OEM-quality. The seal is what keeps the internal wear surface alive, and a dry joint fails long before the bushing does. |
| Sprockets | Genuine or OEM-quality matched to tooth count and pitch. A new sprocket on a worn chain is half a repair, and the reverse is the same. |
Need the parts this covers?
Send the machine model, serial number and the part numbers you need. We confirm fitment before payment and state the grade of every line — genuine, OEM-quality or aftermarket.
Request a quoteFrequently asked
How much life does turning pins and bushings add?
Commonly a third to a half of the chain's original life when it is done at the right point on a chain with sound internals. Done late, on a chain already past its pitch limit, it adds very little and costs exactly the same labor.
Can it be done in the field?
Not properly. It needs a press, clean conditions and new seals for every joint. Field versions done with a hammer destroy the seals they were meant to save, and a dry joint fails within weeks of going back into service.
Does turning change track tension?
It changes pitch, so tension has to be reset afterward by the manual's method and rechecked after the first shift as the new seals settle. A chain that was correctly tensioned before the turn will be too tight after it.