Used Tillage Equipment Inspection Checklist: What to Check Before You Buy

Buying used · 8 min read

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Tillage tools are the cheapest horsepower-hungry machines in the shed, and they're the easiest used equipment to get burned on. A disk, chisel plow, or field cultivator doesn't have an engine to betray it — it hides its wear in plain sight, in parts that look fine until they hit the field and start leaving streaks, ridges, and shallow spots. Soil contact wears everything. Here's how to read a used tillage tool like a used machine, not a used trailer.

Start with the frame: cracks, welds, and straightness

The frame takes every shock the ground dishes out, and cracks are the most expensive problem a tillage tool can have. Walk the full frame — tongue, center section, wings — and look at every weld, especially where the wings meet the center frame and where the tongue joins the hitch. Hairline cracks start at weld toes; bring a flashlight and look close.

Check that the wings fold evenly and sit level when down. A wing that droops or twists means a bent frame tube or a worn pivot — the tool will never run level again without real work. Park it on concrete and eyeball the gang alignment from behind: the tool should sit square, with both sides mirroring each other. If it was pulled with a bent tongue or hit something hard, it shows up as a dog-legged stance you can see from 50 feet.

Check the hitch and jack too. The hitch hole should be round, not wallowed into an oval, and the tongue should be free of patched welds that suggest it was broken and put back together. If the jack is seized or bent, fine — it's a cheap fix — but ask why everything else was let go.

Disks: diameter, edge, and concavity

Disks wear by shrinking. Soil eats the edge, so measure disk diameter across the tool and compare to what the machine shipped with. Sellers often describe blades as "look good" when they're two inches under spec. Two inches of lost diameter is real depth lost, and a full set of replacement blades is not a small parts bill — price the tool against what a new set costs.

Look at the blade edge itself. A good disk has a sharp, even edge all the way around. Look for chipped, cracked, or notched edges — those spots stop cutting and start skipping. Check concavity: a worn disk goes flat in the middle and stops moving soil the way it should. Lay a straight edge across a blade to see how much cup is left.

Then check how the disks are mounted. Look at every gang bolt — on some tools the gangs are held by one long bolt through a stack of blades and spools. If the bolt nuts are loose or the spools are wallowed, the gang wobbles, blades rub, and the tool chatters in the field. Spin a few gang sections by hand and feel for bearings that grind or stick.

Shanks, sweeps, and points on chisel plows and field cultivators

On a chisel plow or cultivator, the wear parts are the shanks, sweeps, and points, and they tell you the machine's life story. Pull a few sweeps and look at the cutting edge: paper-thin edges mean they're at the end, and so is the machine's current setup. Measure the points — if they're stubby, the tool has been running shallow or the owner was skimping on wear parts, which means the whole machine was run on deferred maintenance.

Look at the shank clamps or springs that hold each shank. Springs should stand upright with even tension; a spring that's relaxed, bent, or cracked is a broken shank trip waiting to happen, and when a shank trips hard and breaks, it can take the clamp with it. Check each shank for straightness — bent shanks from hitting rocks or tile will never run at consistent depth across the tool.

On spring-shank field cultivators, check the spring tension hardware for rusted-solid bolts. If you can't adjust the tension, you can't tune the tool for your conditions.

Bearings: the quiet killer

Tillage bearings are exposed to dust, moisture, and vibration, and they fail quietly until they don't. On disk gangs, check the bearings between spools — turn each gang section and feel for roughness or looseness. A gang that rocks side to side on its bearing has a bearing that's already failed or a bore that's wallowed.

On disk bearings with grease zerks, check that they take grease. A bearing that refuses grease has a plugged or broken zerk, or the seal is gone and you're greasing the dirt. Bearings sealed for life need checking by feel — roughness, play, or heat spots on the housing all mean replacement.

Count the bad ones before you negotiate. One bad bearing is maintenance. Six bad bearings across the tool is a parts order, and on wide tools that number climbs fast.

Scrapers, depth control, and running depth

Every disk needs clean blades, and that means scrapers. Check every scraper blade: they should sit close to the disk without touching it, and be adjustable. Scrapers worn to nothing or frozen in place mean the previous owner fought mud buildup and lost, and the disks packed up in wet conditions.

Depth control is where a tillage tool makes or loses money. Check the depth control wheels and their linkages: tires should match in size and hold air, the linkages should move freely, and the adjustment — mechanical stops or hydraulics — should actually hold a setting. If the tool uses hydraulic depth control, cycle it and watch for drift: a cylinder that leaks down won't hold depth across the field, and you'll till a wave pattern into every pass.

Check the transport wheels and tires too. Tires on tillage tools often rot from sitting — check for dry rot and check the wheel bearings for play. A blown tire on the road with a 30-foot tool behind you is nobody's idea of a good afternoon.

Hydraulics: fold, wings, and depth

Cycle every hydraulic function while you watch: fold, wing lift, depth cylinders. Everything should move smoothly and hold position. Look at every hose for cracking, chafing, and wet fittings. A weeping cylinder seal on the wing lock is a tool that will unfold on the road — that's not a maintenance item, that's a hazard.

Check that wing fold pins and transport locks engage positively. If the tool has any safety lock for road transport, test it. A missing or bypassed transport lock is a red flag about how the machine was maintained overall.

Wear parts inventory: count what you're buying

Before you make an offer, do a real wear-parts inventory: how many disks are under spec, how many sweeps and points need replacing, how many bearings are rough, how many scrapers are shot, how many hoses are cracked. Write the numbers down. This does two things: it tells you the real acquisition cost — purchase price plus the parts order that follows it home — and it gives you a factual basis for negotiation that has nothing to do with haggling.

Pay special attention to whether the tool uses common or oddball wear parts. A mainstream disk size with standard spools and bearings is a parts-counter phone call. An orphan brand with proprietary blades and gang hardware is a parts-order problem that gets worse every year the machine gets older.

What to ask the seller

Ask how many acres it's covered and on what soil — sandy soil eats iron far faster than heavy loam, so 2,000 acres in sand can mean more wear than 4,000 in clay. Ask what tractor pulled it and whether it was ever run faster than its rated speed; overspeeding a disk wears blades fast and beats up the bearings. Ask where it was stored — a tool parked inside still rusts at the ground-contact points, but a tool that lived outside year-round will show it in every bearing and bolt. And ask what wear parts were replaced last and when. A seller who can answer that maintained the machine; a seller who can't probably didn't.

The test: pull it if you can

If the seller will let you, hook it to a tractor and make a pass. You don't need a field — even a short pull on a farm road or headland tells you things a walk-around can't: a gang that chatters, a wing that rides uneven, a depth cylinder that leaks down under load, a shank that trips on nothing. Listen for the rhythmic rumble of worn bearings and watch from behind for any section that bounces or skips. Ten minutes behind the tool is worth an hour of looking at it.