Measuring Carrier Roller

Carrier Rollers can be measured with either an ultrasonic tool or with calipers. Both methods are shown in the videos below.

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Potential Observations

What to look for

Below are some of the issues you should be looking for when inspecting carrier rollers. This list does not cover all possible issues, but is a starting point that covers most genral issues.

Shaft Breakage

Examples	Causes	Effects	Recommendations
	• Improper track adjustment — Tight track — Loose track • Misalignment of carrier roller • Wide shoes • Highly packed track • Objects/rocks wedging between carrier roller & track roller frame	• Loss of carrier roller function • Potential track chain interference w/ track frame • Loss of proper topside track travel (Slapping) • Potential interference of track w/ carrier roller stand	• Replace carrier roller & stand if necessary • Proper alignment • Proper track adjustment • Possibly narrower shoes • More frequent track cleaning • Operator technique (Sidewall operation)

Flat Spots Tread

Examples	Causes	Effects	Recommendations
	• Packing • Freezing • Oil loss	• Destruction of carrier roller • Accelerates link wear	• Replace immediately • Remove roller & stand until replacement available; Assure proper track adjustment • Reshell • Frequent cleaning of track roller frame

Off-Center Wear (Tread / Flange)

Examples	Causes	Effects	Recommendations
	• Misalignment of roller w/ sprocket & idler • Sidesloping • Offset shoe • New roller on worn track	• System wear of moving U/C components — Excessive center flange wear — Unbalanced tread wear resulting in shortened wear life — Inside wear on link rails — Side wear on idler center flange & sprocket • Cosmetic link overhang	• String center w/ idler & sprocket • Swap side to side if on sideslope • Continue to run • Reshell

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