Oliver S88 Hydrualics

NoahF · Aug 9, 2023

Anyone know what it would take to add a hydraulic unit to an Oliver super 88 that doesn't have them? Current owner claims that the original owners removed it. I find that kind of hard to believe, seems more likely that they ordered the machine without a hydraulic system. Really nice
looking tractor besides that. Any input is appreciated don't want to buy the machine and find out I need different transmission shafts etc. Is he right did all of these come with hydraulics from the factory? if that is the case where could I find the parts to put it back together? Seems
like at the very least its missing the control levers next to the gear shift. Is the pump in the transmission or external behind the PTO? Not very many Oliver's of this size in my area, familiar with the other major brands of antique machines but I have never had an Oliver and this one
seems to be an outlier in that supposedly it was never used in a field just as a PTO machine for running a silage blower, sheet metal etc is all very nice. what would you all figure its worth?

rrlund · Aug 9, 2023

What does it have to the left of the shift lever? A cast hump? A mechanical cultivator lift? That's where the hydraulic system goes. You just need that unit. It's all self contained. It runs off the PTO long shaft where it runs back to the PTO clutch pack. I bought a Super 77 one time that didn't have one. It just had the cast delete cover on it. I bought a unit off a 770 or 880, I forget which, but I pulled the PTO shaft, took the cover off and dropped the unit in to the hole. Put the PTO shaft back in and you're good to go.

I seem to recall that some of those without a pump, there's something that has to be cut off, a piece of shaft or a casting or something, but that wasn't the case on that Super 77.

NoahF · Aug 9, 2023

Very interesting thanks for the information. It seems like it has the cast hump your talking about, is this the same location where the hydraulic lines would normally run into the machine? If all it would take is finding a complete setup off a puller I would definitely be interested. Ive been doing some research and it seems like many of the hydraulic units are interchangeable.

NY 986 · Aug 9, 2023

I've heard of pulling the hydraulic system to either put on another tractor or to repair at some point but needing the tractor in the meantime. The pump may have been worn to the point of being beyond rebuilding.

rrlund · Aug 9, 2023

There aren't any internal lines. That unit contains the pump, valves and reservoir. You drop it in and the hoses attach to the sides then run back to your couplers. Any unit from a Fleetline, Super or three digit will work, but you'll want one from a later model. The real early ones didn't have levers. They used electric switches that mounted on the steering column, and those, without a doubt wouldn't work anymore.

rrlund · Aug 9, 2023

There aren't any internal lines. That unit contains the pump, valves and reservoir. You drop it in and the hoses attach to the sides then run back to your couplers. Any unit from a Fleetline, Super or three digit will work, but you'll want one from a later model. The real early ones didn't have levers. They used electric switches that mounted on the steering column, and those, without a doubt wouldn't work anymore. The later one would have the levers on top vs on the sides for the second version.

rrlund · Aug 10, 2023

If you put a pump in it, save that delete cover. Tractor pullers want those when they pull the pump or mechanical lift out to lose weight.

oliverkid · Aug 10, 2023

Youll need a unit off of a 77-880. A66-660 unit is smaller. If it had hydraulics before is all bolt on parts. If it has always been a flat top cover you have a 50/50 shot of needing to change the transmission input shaft. There were 2 lengths of shafts. A short one for hydraulic equipped tractors and a long one for mechanical lift tractors. The long shaft had an extra few inches on the tail to carry the drive gear for the mechanical implement lift. This extra few inches occupies the space where the hydraulic pump goes. It is possible to shorten a long shaft but you still have to take it out of the transmission and turn it in a lathe and its case hardened so youll need carbide tooling to cut it. But like I said, if its always been a flat top cover tractor it could have the short shaft already in it. Wont know until you take the cover off and look.

Nate88 · Aug 10, 2023

When I bought my S88 diesel it had the cast tank/housing for the hydraulics and the control levers, but interesting it didn't have the control valves inside the housing. The pump was bolted under the housing but no control valves were in place. I'm assuming it was a cheap mans way to lose some weight for tractor pulling, I don't know for sure. I got a set of used control valves from Maibach in Ohio, of course that was over 20 years ago. I also copied a link here to another post with someone asking similar question for an Oliver 77. Might help you out to see what you need or what the tractor already has on it. Nate
77 hydraulics Post

Nate88 · Aug 10, 2023

One more reference post that might be helpful
Oliver hydraulic pump

GermantownGreen · Aug 12, 2023

To help a guy out.
This pic is the first generation pump and controls, Do not get it, since you have a Super series.
This is on a later 77, disc brakes at the National show this week.

GG Wes

Oliver S88 Hydrualics

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