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Oliver, Cletrac, Co-op & Cockshutt Tractors Discussion Forum
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Cockshutt 1755

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Wade

08-08-2003 17:53:15




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Recently purchased a 1755 diesel. Don't know much about the Oliver built Shutts, but have noticed that a hydralic pump under the cab floor board maintains a "whine" noise when the tractor is idling. Is this typical of this model, or is a problem developing? I've done some light work with it on the 488 haybine. Hydraulics and steering appear to work well.




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ajax implement

08-09-2003 14:35:17




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 Re: Cockshutt 1755 in reply to Wade, 08-08-2003 17:53:15  
I stopped at the local fair today and a friend of mine was loading his 1855 on the trailer. No noise in the hydraulic pump. If you have a 3000 psi pressure gauge it might be a good idea to check the compensator setting too.I forgot to mention that this morning.



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Don-WI

08-09-2003 10:17:42




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 Re: Cockshutt 1755 in reply to Wade, 08-08-2003 17:53:15  
does thew whine sound like it is starving for oil, or is it just a whine? Mine wines all the time(Oliver 1755) and noting has happened yet. It's more of a characteristic of all oliver's that Ive ever been on, mainly when doing a lot of pto work.
Donovan from Wisconsin



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Wade

08-09-2003 20:17:23




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 Re: Re: Cockshutt 1755 in reply to Don-WI, 08-09-2003 10:17:42  
It seems to be a just a "general whine" - if there is such a thing. But I am going to change the filter/oil and see how it reacts.



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ajax implement

08-09-2003 04:26:33




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 Re: Cockshutt 1755 in reply to Wade, 08-08-2003 17:53:15  
One key factor with those units is the filter must be in good condition. You are dealing with a axial piston pump and using the weight of the oil to charge the pump. Always use a 10 micron filter, service (replace) the breather element and use the correct weight hydraulic oil. Do that to start with. I would change all these once a year even if you only get a few hours on the tractor.If the pump's rotating group is going bad they will still pump, but the pump will get exteamly hot and the internal leakage through the case drain will be excessive which is one way onhow you check the condition of the pump. You could also have a wine from gear noise on the pump drive, but do the oil , filter thing first, If you need test information post this on the Hart/Parr web site.

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Lee

08-09-2003 18:45:05




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 Re: Re: Cockshutt 1755 in reply to ajax implement, 08-09-2003 04:26:33  
What do you mean by internal leakage through case drain? I have noticed the hydraulic pump on my 1755 gets extremely hot.



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ajax implement

08-09-2003 19:19:09




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 Re: Re: Re: Cockshutt 1755 in reply to Lee, 08-09-2003 18:45:05  
In any axial piston pump leakage occurs between the pistons and the barrel they move in. Part of this is necessary for lubrication. However as the pump wears this leakage increases.We are dealing with a closed center system. This leakage is also at high pressure so a lot of heat is generated. Since in a closed center system with everything in neutral you should have only output to make up this lube oil, say 10% of rated pump flow for lack of a specific spec. Any output over this will be high pressure oil at the compensator setting (2000 psi if I remember right). Also a basic rule of hydraulics is what you do no use as useable hydraulic energy is wasted as heat energy. That is one reason the case drain is always at the top of the pump and the line goes directly to the reservoir. It sounds to me like you have a leak somewhere and this leak is internal. Now the issue becomes is there wear in the pump or do you need to play Sherloc Holmes and find the source of the leak.If you want more details post on Hart-Parr web site.There is more to it than this but it is a start.

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Wade

08-09-2003 08:05:22




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 Re: Re: Cockshutt 1755 in reply to ajax implement, 08-09-2003 04:26:33  
Thanks ajax, I'll give it a try.



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