Oliver 770 deleting the power booster.

hey everyone so out here in shop this is one of my current projects going on out here this is kind of what remains of a 770 oliver and what we're doing is we are deleting the power booster drive on it because it doesn't work um i could fix it but i don't want to because essentially what the power booster does is you know when this tractor is a straight drive it has six speeds forward to reverse and when you have the power booster drive in it turns it into 12 speeds forward and four speeds reverse so essentially what it is is it's kind of like a power shift so to speak basically say if i'm in first and i'm indirect and it starts pulling hard i'm starting to lose power i can pull the lever and put it into power booster drive which don't quote me exactly on the numbers but what it does is it gives me a 30 percent reduction in ground speed and it gives me a 25 increase in pulling power so we're not going to get too technical on the disassembly because well i already disassembled it but as you can see nose cones off engines out dash is off hydraulic unit is pulled out and the power booster is out one thing i will say that was definitely interesting so i got the factory service manual to help me out with certain stuff i don't really need a lot but it is kind of interesting to see the description that they describe for certain procedures you know it definitely gives a guy a i didn't think of that but actually how it describes the procedure to remove this is it actually tells you to remove the engine with the radiator and the dash all attached to each other so it actually you know it says in the description i'll make sure you see how good your radiator hoses are because that's the only thing going to be holding it to the engine so they have you lifting the engine up and out with the radiator attached full of coolant so you don't have to drain it and then it actually tells you to just lay the dash on top of the valve cover and then you just lift the whole works out as one unit so anyway here's why we did this here's the power booster now this is actually i assembled it back together just so i wouldn't lose any of the pieces but so the clutch shaft this goes into the engine or into the bell housing and then the splines at a clutch and then this is what kind of makes it work so you got a set of clutch packs in here um and when the clutch packs are applied that's what gives you direct drive oops and then it ends up going to the transmission by the input shaft and now when you're in power booster drive power comes through the input shaft and then the clutch plates in here they're just along for the free ride they're just spinning loose there's no pressure on them whatsoever and they the power is going through the clutch pack housing and inside the power booster let me grab a light here if i can find one so when the power goes through the clutch housing it ends up spinning this gear which sends the power up to this gear which is attached to the second gear and then that comes down to this gear which then supplies power to the input shaft sends it into the transmission the one thing i think is very interesting about this gear is the inside of it it's got a you know at first glance it looks like just a roller bearing but then bearings in there are actually an odd shape they're not round they don't spin in there they're almost kind of like a dog bone and what that purpose is is that when you're in direct drive the input shaft just rotates in there freely doesn't affect it whatsoever but when you're in power booster drive and it sends the power through this gear it actually rotates this i think the this whole assembly is called the spray clutch but it actually rotates this bearing in here and locks it to the shaft and it basically that's how it drives it it's just by a friction grip so to speak and that's why that this didn't really work and why i'm replacing it is this in here slipped would slip on the shaft when you're in power booster drive at idle it would drive but as soon as you got on the throttle a little too much it would slip and it would stop moving so you'd go back to direct and go about your tam or go about your day the pieces you need to replace this so you'll need a new in transmission input shaft you would need a a belt pulley delete holder or a belt pulley a coupler and a new clutch shaft now the interesting part is this clutch shaft is particular to a 770 only that's the tough piece to find out of this whole works now i have an 880 with the power booster that needs to be deleted also and what i'm having a hard time finding is this shaft because on my 880 it's a newer version with a helical gear transmission so the input shaft is particular to that tractor so i think i have all the pieces to delete it on my 880 just looking for this one yet a couple other pieces or well yeah at least a couple other pieces you will need is 13 16 frost plugs now i bought the thick deep style because i knew the front of the transmission casting was fairly thick so i thought i was being smart by doing that but as you can see there is a slight little step in there so if you're gonna do it by the shallow ones don't buy the deep ones and then i suppose one of the other particular things that you're gonna have to remove is this pan so how the power booster gets its lubrication through them gears is when the gears and the transmission are spinning they fling oil up this pan catches it and funnels it down through this hole which supplies the power booster oil and that is why in the service manual it tells you or the operator's manual it tells you that if you have a power booster drive you have to put 10 w30 in the transmission because in cold weather 80 90 takes too long to warm up and you'll starve the sprague for oil and burn it out and i suppose another one of the difficult points is this lovely snap ring it sits on the input shaft right in front of this bearing um those are kind of a bear to put back on because there's no ears getting them off wasn't a big deal i just used the right angle snap ring pliers and kind of left the shaft in this back bearing just pulled it out enough that i could expand it and slide it on the shaft and then when i to get it off the rest of the way i just used it against the gear set while it was in there like a slide hammer and just pulled it out and then made sure i caught the snap ring hopefully when i put this back together i do not drop the snap ring in the transmission because i can see me doing that but at least i'm getting smarter in my old age i remember when i did these input shaft bearings on my super 88 and i didn't have all the fancy tools back then so i've saved this this is how i got that snap ring off the one time was just a dinner fork that i literally bent the heck out of so how far some of us have come in our mechanicing abilities so anyway that's kind of what i got going on here in a nutshell and well since i had to pull the hydraulic unit off i got bearings and seals to freshen up the pump a little bit and then when that gets all mounted back together i got a power traction hips sitting outside so that's when i'll redo my hoses and fittings and whatnot but it's kind of all i got for now i know it's not very interesting to just listen to me gab and you know my camera abilities hopefully it'll get better that i'll record some of this as i'm doing it um right now i really need a different camera because when i'm holding it like this i really can't tell if you're seeing my head or if you're seeing half my head but uh anyway that's all for a different time thanks for watching

Channel: OliverNate

Views: 575

Rating: 5 out of 5

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Id: NYUkHQ6H2r4

Length: 12min 1sec (721 seconds)

Published: Sun Nov 15 2020