How to Inspect a Used Combine Harvester Before You Buy

For most Pakistani farmers and contractors, a combine harvester is the single largest machinery purchase they will ever make. The majority of combines changing hands in Pakistan are used or reconditioned imports, and the difference between a good one and a tired one is rarely visible in photos. A machine that looks freshly painted can still hide a worn threshing drum, a tired engine or a cracked chassis.

This checklist walks through what to inspect, in the order an experienced mechanic would, so you can judge a machine on the ground before the wheat or rice season puts it to work.

1. Start with the paperwork and history

Before you climb onto the machine, ask the seller for:

• Import and ownership documents for imported combines, and a clear record of who has owned it in Pakistan.
• Engine hours, and whether the hour meter has ever been replaced. A new-looking meter on an old machine is a reason to ask more questions.
• What "reconditioned" actually means. Ask which parts were replaced and by whom. A repaint and new belts is not the same as a rebuilt engine and new concave.
• How it was used. A combine that cut its owner's own crop is usually in better condition than one that ran contract harvesting day and night across districts.

2. Engine: always see a cold start

Ask the seller not to run the engine before you arrive. A cold start tells you far more than a warm one.

• Listen for hard starting, knocking or uneven running in the first minute.
• Watch the exhaust. Heavy blue smoke suggests oil burning; persistent black smoke under load suggests fuel or injector problems.
• With the engine running, open the oil filler cap. Strong pressure or smoke puffing out (blow-by) points to worn rings or liners.
• Check the coolant for oil, and the engine oil for a milky colour. Either can indicate a head gasket problem.
• Look for fresh oil leaks around the engine and turbocharger, and for signs that the engine was recently washed to hide them.

3. Threshing and separation: the heart of the machine

Worn threshing parts mean grain loss and broken grain, which cost you money every acre.

• Threshing drum (cylinder): inspect the rasp bars or beater bars for uneven wear, cracks or welding repairs. Spin it by hand where safe and feel for wobble.
• Concave: check the bars and wires for wear, bending and gaps. A badly worn concave cannot be adjusted to thresh cleanly.
• Straw walkers or rotor: look for cracked walkers, broken crankshaft bearings and heavy patching.
• Sieves and cleaning fan: damaged or rusted-through sieves let grain out with the chaff.
• Grain elevator and augers: check the chains, paddles and auger flighting for wear, and the housings for holes.

4. Header and cutter bar

• Check knife sections and guards for missing, broken or blunt pieces, and the knife drive for play.
• Inspect the reel tines and bats; bent or missing tines leave crop standing.
• Look at the feeder house chain and slats, a high-wear area that is expensive to replace.
• If the machine has both a wheat header and a rice or maize attachment, inspect each one separately.

5. Hydraulics, drive and steering

• Raise and lower the header several times. It should move smoothly and hold its position without creeping down.
• Check hydraulic hoses for cracking and weeping fittings.
• Drive the machine and test every gear, the hydrostatic drive if fitted, the brakes and the steering for excessive play.
• Inspect the main drive belts and pulleys. Glazed or cracked belts are cheap to fix, but worn pulley grooves are not.

6. Chassis, tyres or tracks

• Look underneath for cracks or fresh welding on the main frame and axle mountings.
• Check tyre condition, or on tracked rice combines, the rubber tracks, rollers and sprockets. Track replacement is a major expense.
• Rust is common on imported machines; surface rust is cosmetic, but rust through sheet metal around the grain tank and sieves matters.

7. See it work, if the season allows

The best inspection is watching the combine harvest. If a field test is possible, check the grain in the tank for broken kernels and the straw behind the machine for unthreshed heads or lost grain. Out of season, at least run all mechanisms at idle and listen for knocking bearings and slipping belts.

8. Bring a mechanic and negotiate on facts

Unless you are confident, take a mechanic who knows the model. Write down every fault you find and get a rough repair estimate for each. That list is your strongest negotiating tool: a seller will accept a lower price far more readily when it is tied to specific repairs rather than a general feeling that the machine is "old".

Find your next combine

AgriWheels lists used, reconditioned and new combine harvesters from sellers and dealers across Pakistan. Compare several machines of the same model before deciding; the price spread between a tired machine and a well-kept one is often wide, and seeing both helps you judge what a fair price is.