A used harvester can save you a lot of money, but a hidden fault can cost even more. Inspect it carefully before you pay.

Engine and hours

• Check the hours, but don't trust the meter blindly. Look at the overall wear too.

• Start the engine cold and watch for heavy smoke, knocking or hard starting.

• Look for oil, diesel or coolant leaks around the engine and hoses.

Cutting and threshing parts

• Check for bent, worn or missing blades.

• Look for heavy wear, cracks or gaps in the threshing drum that are too wide.

• Make sure the sieves and fans are undamaged. And they must clean the grain properly.

Frame, belts and hydraulics

• Check for uneven wear or cracks in tyres.

• Fresh welding patches can hide old damage.

• Cracked belts and loose chains are signs of poor care.

• Operate the hydraulic system header lift and check for slow response or leaks.

Test run and paperwork

• Check registration, invoice and ownership papers.

• Take a trusted mechanic along for an expert opinion.

• See if there are any spare parts or a service center close by.

• Run the harvester for 30 minutes in a standing crop and listen for any strange noises.