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

Oliver 88 Hydro Pump Rebuild Questions

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K. Kilian

04-06-2004 19:01:47

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I took a part the hydro pump I'm rebuilding for use on my 88 RC, and have the following questions:

1. The side plates have been slightly scored by the PTO driven gear. Can a machine shop smooth off the surfaces without too much trouble?

2. How hard is it to remove the needle bearings from the pump sides? Is that something that I can do, or should I let a bearing store take care of it?

3. The gear shaft that passes through the seals has been worn slightly by the seals. Can this be smoothed with a fine emory cloth, or is more machining needed?

Thanks for the help. Sorry for the length.

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Eugene SWIA

04-08-2004 06:33:53

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Re: Oliver 88 Hydro Pump Rebuild Questions in reply to K. Kilian, 04-06-2004 19:01:47

Yes a machine shop can machine the faceplates. To Remove the bearings.Pry the needles out and use a torch to heat bearing cage and plunge into water. They will come out easily. I would have the machine shop polish the drive gear shaft. Then carefully measure and press new seals in to a slightly different depth. You don't have much tolerance to work with. Post if you need more info. Gene

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Nick

04-08-2004 06:29:19

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Re: Oliver 88 Hydro Pump Rebuild Questions in reply to K. Kilian, 04-06-2004 19:01:47

The side plate can be ground until they are smooth. If you fill the bearing cavity with grease, grinding chips will not get in there. How good are your bearings to begn with? Take the gears with you to the shop. A good machinist can help you look at them.
I have always destroyed the bearings by taking them out.
Touch the shaft with some real fine emery cloth.
Make sure the sides or the tips of the gears have not picked up any extra material. It can be cleaned off. Ask me more questions if you want.
Nick

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K. Kilian

04-14-2004 05:29:06

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Re: Re: Oliver 88 Hydro Pump Rebuild Questions in reply to Nick, 04-08-2004 06:29:19

Another question about the pump. When I took the pump off of the base, the relief valve (mushroom shaped piece) had somehow gotten into one of the pump passages (no damage to gears, that I can tell).

However, when I unscrewed the relief valve guide from the base, the relief valve spring was still in the correct place. Any thoughts on how the relief valve could have popped out of the spring, etc.?

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K. Kilian

04-08-2004 06:43:16

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Re: Re: Oliver 88 Hydro Pump Rebuild Questions in reply to Nick, 04-08-2004 06:29:19

Thanks for the help. Right now I plan on replacing the bearings (how pricey are they?), since they probably have 50 years of hard work on them. How do you remove them? Eugene SWIA suggested removing needles and then heating cage/side plate with torch.

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Nick

04-08-2004 12:50:08

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Re: Re: Re: Oliver 88 Hydro Pump Rebuild Questions in reply to K. Kilian, 04-08-2004 06:43:16

The method SWIA suggests is about as good a method you can use. If I remember, the bearings and seals run around $90. Any bearing supplier can get all that for you. Or Korves has them. You did not say if you are close to an AGCO dealer.
Good luck

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