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1855 === 1955 update

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SR

03-06-2001 05:57:30




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I have an 1855 Oliver that I think was put through the 1955 update program. It has the oil cooler and the circulation pump, but I am wondering if there is any other things that I can look for to prove this out. I bought this tractor used and the original owner has passed on so I am out of luck there. Any info would be really helpful.




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Shep

03-07-2001 07:17:37




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 Re: 1855 === 1955 update in reply to SR, 03-06-2001 05:57:30  
I think the oil cooler and circulation pump you are talking about is the Hydro cooler. That is on the left side up front and powered by a belt off one of the front pullys. Is that what you are looking at??

The engine oil cooler is what we are refering to as what is needed on this engine. It is casted into the block on the right side of the engine, halfway back, down low near the frame rail. That is what you need to look for and see if you have one. Some of the Olivers also had an engine oil cooler that hooked into the bottem of the oil filter system with two lines and then went to a cooler on the front of the tractor. You might have one that looks like that.

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SR

03-07-2001 19:17:00




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 Re: Re: 1855 === 1955 update in reply to Shep, 03-07-2001 07:17:37  
Thank you both for the help. Shep: You are correct, the pump that I am talking about runs off of the left hand side of the tractor. It a small gear pump that is driven off of the crank pulley. The more I think about it, the lines do run back to the 3-speed. Was this an option or was it standard?

Mine does have the engine oil cooler mounted down on the right side of the engine as you mentioned. I was also told that the updated 1855/1955 engines had a larger cam in them. I am not sure if the larger meant larger lift or heavier duty?

Thanks again for all the help.

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WFE

03-07-2001 22:29:36




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 Re: Re: Re: 1855 === 1955 update in reply to SR, 03-07-2001 19:17:00  
The small pump to which you are referring on the left side of tractor driven off crank pulley is the power steering pump. 18 and 1955s, also 1755, had new closed center hydraulics which do not create flow until needed, unlike previous 50 series and earlier tractors which had open center, in which hydraulic flow is present all the time the engine runs and flow is readily available by simply diverting flow to steering circuit via a priority valve. Dedicated pump which runs as long as engine runs is needed for power steering in the 18/1955, a highly critical feature which needs to be responsive to flow demands at a moments notice. Over/Under oil lube/clutch engagement and circulation pump is internal in the Over/Under. Hope this helps.

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Shep

03-08-2001 05:21:40




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 Re: Re: Re: Re: 1855 === 1955 update in reply to WFE, 03-07-2001 22:29:36  
You are correct WFE, mine on the 1855 also flows hydro oil through an oil cooler in front of the radiator, I guess that is why I called it a cooler pump. I guess I had never really thought about the pump being a part of the power steering, but it makes sence. Learn somtin everyday!!!!



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WFE

03-06-2001 21:12:58




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 Re: 1855 === 1955 update in reply to SR, 03-06-2001 05:57:30  
1855s produced during and after model year 1974 were equipped from the factory with the 1955 basic engine, which included oil cooler, but still slightly derated in fuel settings. You can consult serial number records and compare them to your 1855. If it was a '73 or before, and has the oil cooler, then chances are it was either put through the update program offered through White in the mid-70s, or it was replaced with a 1955 or late-1855 style engine at a later date by a later owner. Engine serial number should indicate to you what engine was originally for, but I don't have engine serial number records.

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