Oliver 77 fill plug location

Fatjay

Member
I'm under the tractor and see what looks like 3 drain plugs and no fill plugs, but I may be confusing one of the drains for a fill. From what I've read, 4.5 gallons of 10w-30 should do it, but I'm not sure where to put it. It doesn't look like even the highest side plug I can find will take 4.5 gallons either.

Also I keep reading on power booster, but don't know what it is or if I have it. Is the rear split between two locations and seperate for oil?

Don't mind the wet, most of it is hydraulic fluid from the valves up top that I've yet to rebuild.

Here's the side plug and front drain plug:

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Here's the rear plug just behind the rear axle:
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the fill plug is on top in front of the shift lever, you should be using 80-90 wt GL-1 gear oil not 10-30 unless you have the additive to go with it that is no longer available lol.
 

I found it, now to see how hard it is to get to. Can't get it from the other side due to hydraulic resivour.

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I was thinking that. Are they still available? How involved is the process? Removing the loader frame and resivour I'm not sure is possible. The tractor doesn't sit out so it wouldn't get rained on, so ideally nothing other than moisture from ambient air would get in there.

Which drain plug should I use, or should I open them all?
 
   The rear plug is for the differential section and the front plug is for the transmission.   Take both of them out.   If there is any water it will be at the bottom, so will come out first.   If it was my tractor I would put 4 or 5 gallons of diesel in it and drive it for a ways to flush it.  It has spur gears on splined shaft so it won't hurt it by driving.   The fluid that is in the rear differential section gets thrown into the transmission section by the bull gears.   The bearing on the differential drive shaft is open, thus fluid returns to the differential.   Fill at the cap at the top of the transmission only.


   Had to look at the lower photo for a while to figure out there is a truss rod under the final drive to axle housings.   While you are under the transmission look and find a series of digit in the casting, they are the date the casting was poured in the foundry.
 
(quoted from post at 01:12:16 04/21/15)    The rear plug is for the differential section and the front plug is for the transmission.   Take both of them out.   If there is any water it will be at the bottom, so will come out first.   If it was my tractor I would put 4 or 5 gallons of diesel in it and drive it for a ways to flush it.  It has spur gears on splined shaft so it won't hurt it by driving.   The fluid that is in the rear differential section gets thrown into the transmission section by the bull gears.   The bearing on the differential drive shaft is open, thus fluid returns to the differential.   Fill at the cap at the top of the transmission only.


   Had to look at the lower photo for a while to figure out there is a truss rod under the final drive to axle housings.   While you are under the transmission look and find a series of digit in the casting, they are the date the casting was poured in the foundry.
looks like a 770 housing ???????????
 

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