Every excavator reaches the age where a new OEM part costs more than the repair is worth, and that is where the used and rebuilt market earns its place. Kyotechs' own catalogue states condition per listing — brand new or used — and its product range includes rebuilt hydraulic and engine components with test evidence. Whether you buy from Kyotechs or anyone else, the discipline below is what separates a good used part from an expensive lesson.
1. Verify the Part Number Before Anything Else
Used parts are sold from photographs and memory more often than from records. Insist on the part number from the unit itself — stamped, cast or on its plate — and check it against your machine's parts book entry, including supersessions. A pump that looks right but carries the wrong displacement, or a controller with the wrong software state, is not a bargain at any price. If the seller cannot produce a number, the conversation should end there.
2. Ask What the Condition Statement Actually Means
"Used" covers everything from a low-hour take-off to a worn core. Ask which it is, and what evidence supports it: source machine and hours if known, why the part was removed, and what inspection was done. For rebuilt units, ask what was replaced inside — seals only, or the worn rotating group as well — and whether the rebuild was tested. A seller who rebuilds hydraulics should be able to show the component working; Kyotechs' repair programme supplies a test video for every rebuilt item, and that is the standard to hold any rebuilder to.
3. Test Hydraulics the Way They Fail
Hydraulic components fail by internal leakage, so a visual inspection proves little. For a used main pump, the telling measurement is case-drain flow at pressure; for motors, drift under load; for a final drive, the gear oil tells the story — metallic debris on the magnetic plug means the planetary set is wearing, whatever the outside looks like. If you cannot test before purchase, agree in writing what happens if the part fails its first test on your machine. That agreement, made before payment, is worth more than any verbal assurance.
4. Treat Electronics as Software, Not Just Hardware
A used controller or monitor carries a program state as well as a circuit board. Check that the part number matches, ask whether the unit's program suits your machine model, and confirm who handles programming if it does not. Kyotechs pairs its controller catalogue with an ECU software service for exactly this reason. The same applies to throttle motors and solenoid valves: small electrical parts are cheap to buy and expensive to misdiagnose, so confirm the fault is in the part before ordering its replacement.
5. Put the Commercial Terms in Writing
- Condition and scope — exactly what the part number covers: assembly only, or with gearbox, seals, gaskets.
- Warranty position — Kyotechs' own FAQ states that most parts are backed by a warranty against manufacturing defects; whatever the seller, get the term for your part in writing before payment.
- Delivery and preparation time for that product — stated per product, not as a general promise.
- What happens on a mismatch — wrong number shipped, or part fails inspection: agree the remedy before the money moves.
6. Know When Used Is the Wrong Answer
Some parts should be bought new or rebuilt rather than used-as-is: seal kits (rubber ages on the shelf and in the bore), high-pressure hoses, and any safety-related component. And some failures should not become a parts order at all — a final drive killed by neglected gear oil will kill its replacement the same way unless the maintenance habit changes. The honest seller tells you these things. Judge a used-parts supplier by how often they talk you out of the wrong purchase — then check their numbers, their evidence and their terms, in that order.
To start a used or rebuilt enquiry with Kyotechs, send the part number, machine model and the condition you are looking for via the contact page. The documented range is indexed from the home page.
A Worked Example: The Used Final Drive
Put the six checks together on the commonest used purchase of all. A final drive is offered for a mid-size excavator at a third of the new price. Check one: the number on the cover matches your machine's listing, including the cross-references — not just the model name. Check two: the seller states it is a used take-off, gives the source machine's approximate hours, and confirms the drive was working when removed. Check three: you ask for the magnetic plug's condition and the state of the gear oil — clean oil and a clean plug are the best cheap evidence of a healthy planetary set; grey oil or metal flakes end the negotiation. Check four does not apply — no electronics — but check five does: the written terms state the drive's scope (drive only, or with motor), its condition, and what happens if it fails its first loaded test. Check six is the quiet one: your own machine's gear-oil history. If the old drive died of neglect, the used one is being bought into the same conditions, and the service interval gets fixed in the same week the drive is fitted. Run that sequence and a used final drive is a sound purchase. Skip it, and the same drive is a lottery ticket.
Used Engines and Rebuilt Units: The Evidence Standard
Engines deserve the strictest version of the same discipline, because their failures hide deepest. For a used or rebuilt engine, the evidence to require is a starting test — ideally video — plus the diagnostic record if the seller runs one: Kyotechs' engine programme uses ET, Inline 6, IDSS, DX2 and VCOM platforms and supplies starting-test videos for rebuilt engines, which is the standard to ask any seller to meet. Ask what was replaced inside a rebuild (a seal-and-gasket refresh is not a rebuild), whether injectors and turbo were tested or merely refitted, and what the oil pressure and blow-by readings were at test. A seller who has genuinely rebuilt an engine has these answers; a seller who has washed one does not. Price the difference accordingly, and remember that the cheapest used engine is the one you fit once.
Hold those two examples against the guide's opening claim and the pattern is plain: every expensive used-parts mistake is an evidence mistake made earlier, when evidence was still cheap. The part number unrecorded, the oil unexamined, the test video unrequested — each is a thirty-second act skipped. The machinery aftermarket rewards buyers who treat information as the first part they order, because it is the only one that is free.