Quick answer
Ask for a safe demonstration of both travel directions and a separate inspection of each drive area. Record noises, leaks, warnings and differences between sides without assuming the final drive is the cause. Match any repair or replacement proposal to the installed assembly. Travel symptoms can require hydraulic, brake, track and control checks as well as gearbox inspection.
Key takeaways
- Keep left-side and right-side findings separate.
- Record the surface and operating mode during a demonstration.
- Ask for the installed drive identification.
- Use a technician to investigate symptoms, not a guess from video.
- Compare the full installed repair cost and retest scope.
1. Identify the travel system being inspected
A tracked excavator's travel system includes more than the visible outer drive cover. H&R's buyer guide identifies final drives as an inspection area; its parts explanations distinguish the hydraulic travel motor from the reduction gearbox. Ask which assembly a seller means when describing a repaired drive. Record the machine identity and each side's available part number before comparing replacements. A model name alone may not identify the correct assembly for every production version.
Sources for this section:[1]
2. Inspect both sides before movement
From safe ground-level positions, ask the inspector to record leaks, damaged covers, missing fasteners and nearby track condition. Identify the exact location of wet areas rather than calling all oil around a drive a gearbox leak. Recent cleaning can make comparison difficult, so request an additional view after the authorised demonstration. Note anything that prevents access. A photograph of one side should not be used as a condition statement for the other side.
3. Compare movement under the same conditions
Have a trained operator demonstrate travel in an appropriate clear area, following the manual. Record direction, operating mode and ground conditions; avoid comparing clips taken on different slopes or surfaces. Ask about pulling to one side, unusual sound or warnings. Do not ask the operator to improvise a stall test. The practical next step after a difference is observed is a diagnostic brief, because a symptom can involve several systems beyond the final drive itself.
4. Use diagnostic findings to decide the repair
A qualified technician can choose the appropriate hydraulic, mechanical and control checks for that machine. Ask for the test conditions and actual findings, not only a statement that a motor is weak. Volvo's used-excavator guide treats wear and condition as component questions, which is a useful model for keeping the report specific. Where fluids are sampled, record the compartment, oil age and sampling date. Do not use one clean sample as proof of remaining service life.
Sources for this section:[2]
5. Ask what the replacement includes
A repair quote should distinguish a complete unit from a motor, gearbox or smaller component. Ask about part-number compatibility, connectors, mounting and included seals or hardware. Record whether the part is new, rebuilt or used and obtain the supplier's actual terms. Add removal, installation, fluids and a retest to the comparison. Neither a compatible-looking housing nor the same model family is enough to confirm the correct replacement.
6. Keep the travel report with your machine quotation
Send me the machine link and the inspector's observations for each side. Ask whether the quotation includes investigation, repair or only the machine in its current condition. If work is agreed, specify the completion record and operating check required before handover. This gives the receiving team something concrete to compare when the excavator arrives and avoids losing important conditions inside a long message thread.
References
- Used Excavator Buying Guide ↗H&R Construction Equipment Parts · Accessed 2026-10-28
- Buying a used excavator: 10 things to look out for ↗Volvo Construction Equipment · Accessed 2026-10-28
Editorial standard: Updated 2026-10-28. This guide separates general process guidance from machine-specific facts. Confirm the current inventory ID, machine evidence, inspection scope, carrier quotation and destination requirements before making a transaction decision. Read our editorial and verification standard.