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Topic: Re: used 100 h.p. tractor purchase
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| RodInNS
07-15-2009 05:27:48
216.118.158.123
20703
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The older Deere closed center system was simple... It was also costly to fix, or to at least fix it right.
The biggest problem I see with them is that the system is never at rest and constantly given to overheating if it starts leaking or you do a lot of heavy hydraulic work with it.Ford had their problems with load sensing valves on the 10 series systems as they were quite complicated... but if you go to the true closed center, variable displacement, load sensing systems that they use today I believe you get a pretty good system. All the advantages of variable displacement/closed center with a system that can unload itself when there's no demand.
That was the failing of the Manheim Deere's around here... and these Deere's he's looking at are all Manheim tractors. I'd not particularly hold that against them if they'd do the job tho. They're still pretty good tractors. The ones I see around this area, in spite of their hydraulic troubles... have given little trouble otherwise and all have high hours. Rod
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| low budget
07-16-2009 07:14:13
170.215.214.112
20707
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Re: used 100 h.p. tractor purchase in reply to RodInNS, 07-15-2009 05:27:48
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| You are correct that the utility (Manheim) Deeres are prone to hyd problems, but I have found its usually leaks in the low pressure (transmission)system.
The transmission pump is a gear type open center pump that provides oil under controlled pressure (about 175 psi)to apply the pto clutch and HiLo clutch, oil not used for those functions supplies the main pump, and then goes on to the cooler and supply the brake reservoir and transmission lubrication.
Too much leakage = no hydraulics, possible loss of brakes, and lack of trans lubrication. Lots of internal lines and O-rings for leakage to develope. Any leakage in the main hyd makes things even worse.
I much prefer the simple system my Ford 5000 and 7700 have.
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| RodInNS
07-16-2009 10:32:54
216.118.158.123
20709
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Re: used 100 h.p. tractor purchase in reply to low budget, 07-16-2009 07:14:13
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| Mostly 3130's and 40's that I've seen around here. They've been plauged by both high and low pressure leaks. I think it's a coin toss as to which is worse on this bunch that a couple of guys own as I think every one has had several of both.
To be fair, the Ford's can get leaks in their low pressure clutch circuits too. I've had a few of them on my own... Blown O-rings, bad regulating valves, cracked tubes and such things and nearly the only way to find some is by pulling the lift cover, diverting the main pump flows... and run it to find the leaks.Rod
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