Go BottomJohn Deere JD 790 life expectancy
 | kleinchris
Join Date: Jun 2007 Posts: 269 Westminster, Texas 
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2007-07-21 143930
Anybody know ball park figures on life of a 790 in hours? Specific example would be great. IE: Expect the engine to start losing compresion at 1000 hours...
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Add PhotoJohn Deere JD 790 life expectancy
 | candoarms
Join Date: Mar 2007 Posts: 1932 North Dakota 
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2007-07-21 143932
Kleinchris,
It's all but impossible to provide this information. Aside from the fact that every once in a while a manufacturer will receive a bad batch of bearings, rods, pistons, etc.......we also have to deal with the level of service the tractor receives during its lifetime, as well as the type of work it has been involved with.
General rule of thumb.........
A tractor engine should be entirely overhauled at about 5000 hours.
Most tractors with this many hours on them have had at least the lower end of the engine gone through.....rods, crank, bearings, seals, pistons, and rings.
The engine's heads, which contain the valves, rocker arms, and push rods, may not need to be overhauled at 5000 hours, but while the engine is out, why not do it?
An engine that has been neglected or abused; or one that has been used for foundry work, where silica sand is present; may not last nearly as long.
Surprisingly, many tractor engines don't last nearly 5000 hours, simply because they have been started too many times, and then used for very short jobs. These short runs are very hard on diesel engines.
Then again, I know of some State-owned tractors, used for mowing ditches, which have over 10,000 hours on the engines, with absolutely no sign of needing an overhaul.
Joel ....
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Add PhotoJohn Deere JD 790 life expectancy
| kleinchris
Join Date: Jun 2007 Posts: 269 Westminster, Texas
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2007-07-21 143943
Cado, thats what I was looking for. Thanks ....
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