1. Measuring Internal Wear (Chain Stretch) Internal wear on sealed and greased chains is primarily identified by chain stretch (pitch extension).
Inspection Method: Measure the distance between pin centers over a span of 4 to 5 links.
Assessment: Compare the measured data against the OEM specifications for a new chain to determine the percentage of wear.
2. Troubleshooting: Worn Pin Ends External wear on pin ends is often caused by hillside operation, uneven terrain, incorrect chain tension, or excessive roller wear.
Corrective Action: If chain elongation is within limits, adjust the chain tension and rotate the rollers to distribute wear.
Installation Note: If this wear pattern appears immediately after installing a new undercarriage, inspect the track guards. Ensure they are not positioned too close to the chain, causing friction.
3. Troubleshooting: Loose Pins If there are no assembly errors, loose pins are typically caused by excessive bending stresses (lateral loads) during heavy-duty operation.
Prevention & Solution:
Inspect and replace worn track shoes immediately.
Check and re-torque track bolts.
Recommendation: Consider fitting narrower shoes to reduce leverage and bending stress on the pins.
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