2003 - Volume #27, Issue #3, Page #33
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How To Buy A Great Used Combine
With the high cost of buying a new combine, farmers across the country are looking for ways to rebuild and revamp older machines or purchase used models with low hours. The used market is getting tighter every year because manufacturers aren't building as many new machines and dealer inventories of used machines are down. Buyers often have to search many lots or auctions for a model with the options and/or accessories they want. Once you find a machine, you can't assume that it's "field ready" just because the dealer or auction bill says so. George Kuchar, who has more than 35 years of combine mechanical experience as a farmer, a custom harvester and most recently as a performance parts supplier, helped us develop a "checklist" of what to look for when you're evaluating a used combine.
Check Hours, Not Acres
The real test of a machine's use isn't the number of acres the machine has harvested, it's the total hours on the engine and the hours on the separator. The total hours show the length of time the engine has run, while the separator hours indicate the actual hours the machine has spent threshing. Kuchar says a high hour machine isn't a problem, as long as the unit has been well maintained. Without proper care, however, even low hour machines can have problems.
George's rule of thumb is that most machines will operate without major repairs for 1,000 û1,200 separator hours. Beyond that, an owner can expect to replace the concave, the rasp bars, the chopper knives, and worn belts in the next 1,000 hours.
Machines that have 4,000 hours or more may be totally re-built and have 1,500 û 3,000 more usable hours.
When looking at used machines, thoroughly check the available maintenance records and look for any "red flags" that might indicate repeated problems. If you're not confident in reviewing the records or examining the machine yourself, have an experienced mechanic go over the records and machine with you.
Look For Chaff &
Worn Parts
Physical appearance is the first way to judge a machine. If there's evidence that chaff has collected around the bearings, behind the shields and on the frame, and if that chaff looks like it has been matted down and rained in place, that's a sign of poor upkeep. Kuchar says any chaff that stays on a machine over winter collects moisture, even if the machine was shedded. That moisture buildup, says Kuchar, reduces bearing and seal life.
Even if a machine looks clean, Kuchar says to remove or look behind every shield. If wear points show up next to pulleys, that could be a sign the machine wasn't cleaned during harvest.
Another area to check for discolored paint is on the engine and in the engine compartment. If paint on the header covers or underneath the engine hood is discolored or burned, the engine may have been overheated. You may want to seriously inquire about the condition of the engine to determine if it has been overhauled or worked on recently.
Check Lubrication
Examine the lube fittings on shafts and greaseable bearings. If they look dry and unused, perhaps the operator neglected daily and seasonal greasing. If the machine you're examining is on a dealer lot, ask to lube the machine and see if fittings accept grease. Any that don't should be "flagged" and repaired or replaced by the dealer.
Check Fluid Levels
Regular oil and fluid changes should be a part of preventive maintenance, but some of today's fast-paced operators may overlook that job and just top-off the engine oil, the transmission fluid, and the radiator fluid. If the machine you're serious about is on a dealer lot, pull a sample of the engine oil and the transmission fluid. Have an oil analyst check the oil for purity, acid content and small metal or dirt particles. If the oil checks out, the fluids were probably changed at recommended intervals. If it doesn't, the engine and/or transmission may be experiencing irregular wear, a costly problem you may not want to assume. Also check the color of the radiator fluid and be sure that hoses and connections are sound
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