Slew Ring, Pins and Bushings: Comparing Play on a Used Excavator

1. Separate attachment movement from upper-structure movement

Start by naming the area of concern. Movement between bucket and linkage is different from movement at the boom base or between the upper structure and undercarriage. Ask for a wide shot and then an identified close-up so the inspector can relate the two. Ritchie Bros. highlights slew-ring and attachment connection play in its buying guidance. Use these as inspection prompts, not as a conclusion that every visible movement requires the same replacement.

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2. Request a recorded measurement and its method

A useful report names the measuring point, tool, setup, reading and comparison limit. The inspector should use the service information for the exact model and configuration, with safe isolation and positioning. Do not adopt one internet clearance value for every excavator. Ask whether movement was measured in more than one position and whether the procedure distinguishes bearing movement from other sources. Keep photographs of the setup with the readings so a repairer can interpret them.

3. Read lubrication and repair history alongside the finding

Ask for available lubrication records and previous work on the affected connection. A receipt saying pins changed leaves open questions about bushes, bores, seals and alignment. Record which parts were renewed and when. The manufacturer guidance on repaired equipment stresses understanding the work rather than rejecting a machine simply because it was repaired. Our purchase discussion should use the actual repair record and present condition, not a general label such as fully refurbished.

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4. Compare complete repair proposals

Request an itemised scope covering inspection, parts, access labour, any machining and a final check. Ask whether the price assumes the bores and surrounding structure are serviceable. A low parts-only figure is not comparable with an installed repair. If the machine will be exported, ask your local repairer whether the work can be performed at the destination and whether the identified parts are available. Keep timing separate from an unconfirmed delivery promise.

5. Leave loaded tests and adjustment to qualified people

Do not stand beneath an attachment or put hands into a joint during a demonstration. Ask the inspector to specify a safe procedure and exclusion area. A camera can show a symptom from a safe distance; it cannot measure every internal condition. If a test cannot be completed, retain the issue as an open decision item. Do not treat fresh grease or paint around a connection as evidence that its mechanical clearance is acceptable.

6. Put the finding into your buying comparison

Record the offered machine, observed joint, measured result, proposed work and acceptance check in one line of your comparison sheet. Ask me to identify which work is included in the quotation and which remains your responsibility. You can then compare two machines on purchase plus known repair scope. Keep the inspection date attached to that finding rather than presenting it as a permanent condition guarantee.