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Older JD Twin Engine service Life

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Jimbob

02-11-2003 12:53:42




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I am not a tractor expert, however I know in industrial/commercial applications low RPM engines have a long service life. The model 60 is 975 rpm at full output. Any idea how many hours this engine can run between major overhauls?




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Ralph

02-11-2003 14:04:08




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 Re: Older JD Twin Engine service Life in reply to Jimbob, 02-11-2003 12:53:42  
I stopped to talk to a fellow in the early 80's. Making haylage with a Papec chopper and a low seat 60. Said there were either 13,000 or 16,000 hours on it and had not been overhauled. It was the first 60 in Clark Co WI., and it had a clock type hour meter, so I don't doubt it. He said the PTO shaft was getting a good twist to it and it was difficult to switch from the chopper to the spreader. Tractor was sold on estate auction several years ago.
Also have a friend with a Ford 9000 (truck with a spreader box (lime)) with a Cat 3406. Supposed to have 40,000+ hours on it with the same rings, but have rolled two sets of bearings into it. He has driven the truck since new.

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G-MAN

02-11-2003 13:28:35




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 Re: Older JD Twin Engine service Life in reply to Jimbob, 02-11-2003 12:53:42  
That depends on a lot of factors, such as service, loading, type of application and other things. Those engines run slow, but also keep in mind that fuels and lubricants were much more primitive in those days than they are now. Oils didn't have the anti-wear and detergent packages that modern ones do, so they didn't protect parts as well as current lubricants. Air filtration systems also weren't up to today's standards. Infrequent and improper service will destroy an engine very quickly. An engine that is frequently started and stopped and not brought up to operating temperature will also wear out more quickly. All of those things said, two-cylinder engines would still last many thousands of hours when properly operated and maintained. I once worked on a 730 diesel that showed in excess of 9000 hours on the speed-hour meter, and it was supposed to be original. That's still a lot of hours, even if it had been overhauled once.

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Drivetrain just as Tough? Jimbob

02-11-2003 15:22:52




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 Re: Re: Older JD Twin Engine service Life in reply to G-MAN, 02-11-2003 13:28:35  
Getting a JD 70 is a very interesting idea. You can not hardly ware the engine out. Wonder if the drivetrain is just as stout?



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G-MAN

02-11-2003 16:26:55




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 Re: Re: Re: Older JD Twin Engine service Life in reply to Drivetrain just as Tough? Jimbob, 02-11-2003 15:22:52  
I've heard of some drivetrain problems on a couple of different models of two-cylinder (early Bs perhaps?), but definitely not on the G/70/720/730 tractors, unless I'm missing something. Those transmissions, differentials and final drives are built plenty strong, and will last a long time in harsh conditions when properly operated and maintained. There are always those that can tear up an anvil in a sandbox, but the vast majority of Deere two-cylinders will stand up to about anything. Those old straight-cut spur gears are a little noisy, but they're tough as nails. Not having a right-turn (ring and pinion) in the differential also helps a bunch.

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