Buying used heavy equipment can save you serious money over new — but the savings disappear fast if you buy someone else's problem. A used excavator, dozer, or wheel loader is a big-ticket, hard-to-return purchase, and most of them sell as-is. This guide walks through what to check before you sign, from the hour meter to the undercarriage to the fine print on warranty and delivery.
Hours, age, and how the machine was actually used
Hours tell you more than model year, but neither number means much on its own. A machine with low hours that sat outside for years can have dried seals, cracked hoses, and rusty cylinder rods; a higher-hour machine that was serviced on schedule and worked in easy conditions can have more life left in it. What matters is the work it did and how it was cared for.
- Match the wear to the hours. Worn pedal pads, a shot seat, polished control grips, and worn steps on a supposedly low-hour machine suggest a rolled-back or replaced meter.
- Ask what it did. Grading topsoil is gentle; pushing rock, demolition, and land-clearing are hard on the undercarriage, hydraulics, and structure.
- Pull the ECM or telematics data if the machine has it. Modern machines log true hours, load history, and fault codes — a dealer should be able to print this for you.
- Think in component life, not just the meter. Undercarriage, final drives, and eventually the engine are all rated in thousands of hours; a cheap machine sitting right before a major rebuild isn't actually cheap.
The walkaround: undercarriage, hydraulics, leaks, and wear
On a tracked machine, the undercarriage is one of the largest recurring costs you'll ever own, so start there. On wheeled machines, tires play the same role. Then work through the hydraulics, look hard for leaks, and check every wear point you can reach.
- Undercarriage: check grouser (track pad) height, sprocket teeth (pointed or hooked teeth are worn out), idlers and rollers for leaks or flat spots, track tension, and loose or missing pad bolts. Ask whether a wear reading has been taken with a gauge.
- Tires (wheeled machines): look for sidewall cracks, cuts into the cords, chunking, and mismatched sizes. Large loader tires are expensive to replace.
- Hydraulics: run every function through its full range. Watch for cylinder drift — a raised boom or bucket that slowly settles points to worn seals or valves. Listen for pump whine or cavitation, and inspect cylinder rods for scoring, pitting, and rust.
- Leaks: park on clean, dry ground, run the machine up to temperature, then look underneath. Weeping is common on old iron; steady drips from the final drives, swing gearbox, or engine are not. Check hoses for bulges, chafing, and weeping fittings.
- Cold start and exhaust: insist on a cold start. Blue smoke means it's burning oil, white can mean coolant or unburnt fuel, and heavy blow-by from the crankcase breather signals worn rings.
- Wear points and aftertreatment: check bucket teeth and cutting edges, and rock the bucket to feel for pin-and-bushing slop. On Tier 4 machines, ask for a diagnostic scan and check for DPF, DEF, and SCR faults or regen problems — those repairs are costly.
Paperwork: records, fluid samples, and a clean title
The story the seller tells should match the paper. Ask for the service history and the invoices for any major work — an engine, hydraulic pump, or final drive rebuild changes what the machine is worth.
- Get the maintenance records. Regular oil and filter changes and documented dealer service are worth paying more for.
- Pull fluid samples. Oil analysis (often called SOS or fluid analysis) is cheap and can reveal internal wear metals, coolant in the oil, or fuel dilution before you buy. Milky oil on the dipstick is a walk-away.
- Verify the serial number or PIN stamped on the machine matches the paperwork.
- Run a lien check (a UCC search) so you don't buy a machine the bank still has a claim on, and confirm the seller can hand you a clean bill of sale.
Get a third-party inspection — especially sight-unseen
If the machine is far away, you're bidding at auction, or you're just not confident checking it yourself, pay for a professional inspection. Independent inspectors — and many reputable dealers — will do a documented inspection with photos, fluid samples, and an ECM download. A few hundred dollars is cheap insurance against a five- or six-figure mistake, and it's close to mandatory on anything you'd buy without standing next to it first.
Delivered price, warranty, and the fine print
The sticker isn't the real price, and "used" rarely means "guaranteed." Nail both down before you sign.
- Get the delivered price, not the sticker. Heavy equipment needs the right trailer (a lowboy or RGN for large machines) and often oversize or overweight permits, and long hauls add up. Inspect the machine at delivery before you sign the bill of lading, and note any transport damage on it.
- Read the warranty terms. Most used equipment sells as-is, meaning no recourse once you sign. Some dealers offer a limited powertrain or hydraulic warranty, a certified-used program, or an extended service contract — read what's covered, the deductible, where service must be performed, and what's excluded (aftertreatment often is).
- Check for remaining factory warranty. On newer machines some coverage may transfer — verify that directly with the manufacturer, not just with the seller.
Why dealer service and parts support matter more on used iron
A used machine will need parts and service sooner than a new one, so who you buy from matters as much as what you buy. A dealer who stocks parts for that brand and model, has technicians trained on it, and can put you in a rental during downtime is often worth more than a slightly cheaper machine from a seller who disappears after the sale.
- Ask about parts availability for the specific model. Orphaned brands and gray-market imports can mean long waits and high prices.
- Ask about field service rates, loaner or rental options, and typical parts lead times before you're broken down.
- This is where a dealer's reputation shows. Look at how they handle problems after the sale, not just the number on the tag.
The short version
- Hours and model year mean little alone — match the wear, the work history, and the service records against the meter.
- On tracked machines, inspect the undercarriage first; it's one of the biggest costs you'll own. On wheeled machines, check the tires.
- Pull fluid samples and run an ECM or diagnostic scan before you buy — cheap tests that catch expensive problems.
- Most used equipment sells as-is, so get a delivered price and read the warranty fine print before you sign anything.
- Buy from a dealer who can actually support the machine with parts, service, and a rental when it's down.