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

55 series hyd charge pumps

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Author  [Modern View]

02-12-2020 17:38:54

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Is it possible to convert an early 55 series that had the belt driven hydraulic circulator pump to the later style that had that pump located behind the pump?

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02-14-2020 18:29:11

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 Re: 55 series hyd charge pumps in reply to dep, 02-12-2020 17:38:54  
Yes but it's not an easy swap. The drive gear in the transmission is a different tooth count and cut at a different angle, so to do this update you need to pull the top cover/ hydraulic unit and change the gear in the transmission first, then the rest is "outside changes". I've done them in every early 55 series tractor that needed an input shaft put in...if you look in the parts book under transmission it'll show the serial number break and the tooth count, etc

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young mechanic

02-13-2020 18:55:58

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 Re: 55 series hyd charge pumps in reply to dep, 02-12-2020 17:38:54  
I'm not sure how the pluming would work if at all, but I've thought about just tying in to the low pressure circuit and using some sort of restricting valve to reduce pressure going to the cooler. What you would have to figure out is how to maintain enough flow to the cooler but still have enough pressure for the low pressure circuit, ( pto, brakes, etc.)

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02-13-2020 14:30:04

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 Re: 55 series hyd charge pumps in reply to dep, 02-12-2020 17:38:54  
If you are talking a about the cooling pump, belt driven, yes it can be done. I have not done this myself, but i know of someone that has. The cooling pump is then driven off the same drive as the main pump, internal. Dont quote me on this, but i think you need to change the housing that supports the pump, as well as the drive. Dont think its cheap to do, but it sure makes for a cleaner look.

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