When buying used tractor implements, sort every fault into one of two piles. Wear parts that bolt on and off, such as blades, cutting edges, tines, shear bolts, pins, bushings, hoses and tires, are usually fixable if replacement parts still exist for that model. Damage to the structure or the drive, such as a cracked or twisted frame, a gearbox that grinds or sheds metal, or an implement that does not fit your compact utility or agricultural tractor, is usually a walk-away. The rest of this guide shows how to tell which pile a fault belongs in.
The distinction matters because many used implements have so few moving parts that every fault looks cheap to fix. A weeping gearbox seal or a worn cutting edge can be a fair bargaining point. A bent spindle housing or a three-point hitch mounting that will never match your tractor is a bill that starts the day you bring it home.
Start with fit, not condition
A perfect implement that does not fit your machine is still a walk-away. Before you look at a single weld, confirm the basics against your own tractor's documentation:
- Three-point hitch category. The lower link pins and top link pin must match your hitch category, or have a correct, manufacturer-approved bushing arrangement. Our guide to identifying your three-point hitch category shows where to measure.
- PTO speed and spline. A 540 rpm implement on a 1000 rpm output, or the reverse, is not a matter of adapters. Check the implement's decal or manual for the required speed.
- PTO shaft length. A used driveline may have been cut for a different tractor. It needs to be checked against your own three-point hitch geometry, not the seller's.
- Weight and power. The implement's weight has to sit within what your three-point hitch can lift and your tractor can hold stable, and its power demand has to sit within your tractor's rated PTO horsepower.
If you want a single list to walk through at the seller's yard, the equipment compatibility checklist sets out the checks in order. Do not rely on the seller telling you "it ran fine on my tractor." Their tractor is not yours.
Identify the implement before you judge it
Everything on this site follows one chain: make, model, year, serial number, part number, specifications, application. A used implement breaks that chain more often than a used tractor does, because decals fade, serial plates rust off, and older implements change hands several times.
Find the serial or model plate first. It is usually riveted or welded to the main frame, the A-frame, or near the gearbox. Photograph it. With the make and model in hand, you can look for an operator's manual and a parts list from the manufacturer or a dealer for that make.
This is the most underrated check in the whole inspection. If you cannot identify the model, you cannot confirm replacement parts exist, and a fixable fault becomes a fabrication job. An unidentified implement with a worn gearbox is a very different purchase from an identified one with the same wear.
University of Wisconsin extension writer John Shutske, in Key Factors When Purchasing Used Farm Equipment and Machinery (read 2026-09-23), advises buyers to always obtain an operator's manual with used equipment and to research known weaknesses of a specific make and model before buying, because some designs have well-documented failures.
Fixable or walk-away: a triage table
The table below groups the faults buyers most often find. "Fixable" assumes parts are available for that model and the repair is within your ability or your dealer's. Treat it as a way to sort what you see, not as a verdict on a specific machine.
| What you find | Usually | Why |
|---|---|---|
| Worn or chipped blades, cutting edges, tines | Fixable | Designed as replaceable wear parts |
| Missing or sheared shear bolts | Fixable | A consumable, but ask why they sheared |
| Worn three-point hitch pins and bushings | Fixable | Bolt-on parts, if the frame holes are not egg-shaped |
| Elongated pin holes in the frame or A-frame | Caution | Needs welding or machining, not a part swap |
| Weeping gearbox seal, oil clean, turns smoothly | Often fixable | Seal replacement, if the shaft is not scored |
| Gearbox grinds, knocks or has sludge or metal in the oil | Walk-away or budget for a gearbox | Internal wear, not a seal problem |
| Gearbox loose on its mount, cracks around the base | Walk-away | The deck or frame around it is failing |
| Cracked, dry-rotted or leaking hydraulic hoses | Fixable | Replaceable by a hydraulic shop |
| Hydraulic cylinder that drifts or leaks at the rod | Caution | Reseal is possible; a bent or pitted rod is worse |
| Cracked tire or dry rot on tail or gauge wheels | Fixable | Replaceable wear item |
| Twisted deck or bent main frame | Walk-away | Alignment problems do not bolt off |
| Heavy weld repairs across the main frame | Caution | Shows past structural failure |
| Missing PTO driveline shield or implement guard | Fixable only with correct parts | Must be replaced before use, never run without |
| Wrong three-point hitch category, PTO speed or spline for your tractor | Walk-away | A fitment mismatch, not a condition fault |
Gearboxes: the fault that decides most rotary implement purchases
Rotary cutters, tillers and post hole diggers all carry a gearbox, and it is usually the most expensive single part on the implement. That is why "the gearbox weeps" is the question most buyers bring home.
A slow weep at the input or output shaft seal is common on older implements. On its own, it tells you a seal has aged. What it does not tell you is whether the gearbox has been run low on oil. So check three things:
- The level and condition of the lubricant. Remove the level or fill plug and look. Clean oil at the correct level is a good sign. Milky, sludgy or very dark lubricant is not.
- The drain plug, if you are allowed to pull it. Some drain plugs are magnetic. A fine film is expected on many gearboxes; chunks or flakes point to internal wear.
- How it turns. With the driveline disconnected and the tractor off, rotate the input shaft by hand. Grinding, notchy spots or a knock mean bearings or gears, not seals.
Some owners pack a leaking gearbox with heavy grease to stop it dripping before a sale. Be careful reading this, though: some manufacturers specify a semi-fluid grease rather than gear oil in certain gearboxes from the factory. Check the operator's manual for that model to find out which lubricant it should contain before you treat grease as a warning sign.
Also grip the gearbox and try to rock it. Movement at the mount or cracks in the deck around the base usually mean the structure holding the gearbox is failing, and that is a walk-away regardless of what is inside it.
Drivelines, shields and guards: replace, never remove
Used implements often arrive with a missing or broken PTO driveline shield, a cracked cone, or a guard that has been taken off. The shield being there, and in good condition, also tells you something about how the last owner treated the machine. The Wisconsin extension article makes the same point, noting that the presence of safety shields may indicate how well the previous owner cared for the equipment.
A missing shield is fixable only in one way: the correct replacement shield or guard for that driveline and implement, fitted before the implement is ever run. Never operate a PTO implement with a shield or guard missing or damaged. If the correct shield cannot be sourced for that model, treat the implement as a walk-away for any job that uses the PTO.
On the driveline itself, check the universal joints for play, look for a bent tube, and confirm the telescoping halves slide freely. If the implement has a slip clutch or shear bolt, confirm which it is from the manual, because an owner may have replaced a shear bolt with a harder bolt that no longer protects the gearbox. If the driveline was shortened for another tractor, it has to be measured again on yours, and our guide on how to measure a PTO shaft length covers why both the collapsed and extended lengths matter.
Frames, welds and the three-point hitch
Walk around the implement and sight down every edge. A rotary cutter deck, a box blade frame or a tiller housing should be straight. A deck that rocks on flat ground, a twisted A-frame, or side skids at different heights suggest the implement hit something hard or was lifted awkwardly.
Look closely at welds. A neat factory weld is uniform along its length. A lumpy repair weld across a main member tells you that part has already cracked once. That is not an automatic walk-away on a light implement, but it lowers what the implement is worth and raises the chance of another crack in the same place.
At the three-point hitch mounting, check the pin holes in the lower link brackets and the top link mast. Round holes with worn pins are a parts job. Oval or egg-shaped holes mean the frame itself has worn, and that is welding or machining work.
Hydraulic implements
Hoses, fittings and cylinders are all replaceable, so a hydraulic fault on its own is rarely a walk-away. What changes the picture is fit: the implement's couplers and hydraulic demand have to match what your tractor provides, and a used implement may have been re-plumbed with couplers from a different standard.
Never run your hand along a pressurized hose to find a leak. Hydraulic fluid under pressure can penetrate skin, and that is a medical emergency, not a repair. Inspect with the system relieved of pressure and the implement lowered to the ground, following the tractor and implement manuals.
Where you stop and confirm
This is the point where you would otherwise hand over money, so stop here and confirm against your own machine. Before you pay, check the implement's model against the manufacturer's specifications and your tractor's owner's manual for three-point hitch category, PTO speed, weight and power demand, and confirm that the parts you need are still available. If the model cannot be identified, the gearbox shows internal wear, or a shield or guard is missing and you cannot confirm the correct replacement, have a qualified equipment dealer or technician inspect it before you buy.
The older inspection guides say the same. Used Farm Equipment: Assessing Quality, Safety, and Economics (NRAES-25), a 1987 Northeast Regional Agricultural Engineering Service guide held on Cornell's eCommons (read 2026-09-23), lays out a methodical inspection and warns that contemporary safety features may not be present on used equipment. Its age is the lesson: the older the implement, the more likely it predates current guarding, and the more your inspection has to account for that.
What an inspection cannot tell you
A standing inspection has limits, and it is worth being honest about them. You cannot hear a gearbox under load without running it on a tractor, which the seller may not allow. You cannot see inside a sealed bearing. You cannot confirm how many hours an implement has worked, because most have no meter.
That is why the fixable pile only stays fixable when three things are true: the implement is identified, parts exist for it, and it fits your tractor. Lose any one of those and the bargain is usually a project.
FAQ
Is a leaking gearbox on a used rotary cutter a deal-breaker?
Not always. A slow seal weep on a gearbox with clean lubricant at the right level that turns smoothly is often a seal job. Grinding, knocking, sludge or metal debris point to internal wear, which usually means budgeting for a replacement gearbox or walking away.
What is the first thing to check when buying used tractor implements?
Fit. Confirm the three-point hitch category, PTO speed and spline, PTO shaft length, weight and power demand against your own tractor's owner's manual before you judge condition.
Can I use a used implement that is missing its PTO shield?
Not until the correct replacement shield for that driveline and implement is fitted. Never run a PTO implement with a shield or guard missing or damaged. If the right shield cannot be sourced, do not use the implement on the PTO.
How do I find parts for an old implement?
Start with the serial or model plate, then look for the operator's manual and parts list from the manufacturer or a dealer for that make. If the model cannot be identified, parts availability cannot be confirmed.
Should I bring someone to inspect a used implement?
If you are unsure what you are looking at, yes. A qualified equipment dealer or technician can judge gearbox wear, weld repairs and fitment against your tractor more reliably than a visual check alone.