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Oliver, Cletrac, Co-op & Cockshutt Tractors Discussion Forum
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Re: Re: Oliver 880 Torque problems

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mitch

04-17-2004 18:02:13




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what is sprag clutch?? is that the same as over running clutch in housing of torque inside second gear that goes against transmmission housing. there is no fluid in it yet trying to clean out rear-end with some diesel fuel what kind of fluid do i need?? i have some hydra-trans to put in it is that good enough??




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Wrenchbender

04-17-2004 21:10:45




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 Re: Re: Re: Oliver 880 Torque problems in reply to mitch, 04-17-2004 18:02:13  
Yes the sprag clutch is the over-running clutch. It may be in backwards and that is why it is not pulling properly. I believe the Power-Booster has it's own oil, seperate from the transmission. WB.



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Scott Green

04-18-2004 04:04:32




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 Re: Re: Re: Re: Oliver 880 Torque problems in reply to Wrenchbender, 04-17-2004 21:10:45  
The power booster gets its oil from the transmission , pumping action of the gears. That's why if you have power booster drive , 10W-30W oil is a must. The system holds one more quart due to having the power booster drive.



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J. Schwiebert

04-18-2004 10:51:55




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 Re: Re: Re: Re: Re: Oliver 880 Torque problems in reply to Scott Green, 04-18-2004 04:04:32  
Yes the oil comes from the transmission. That is why that little stamped trough is under the fill plug so you get an initial fill in the booster. I was looking at something else the other day and I though the note on the instruction sheet for adding the oil pump to the 880 was interesting. The author just said fill with the recommended oil. When 80-90 gear oil was introducted they said in a service meeting go ahead and use it. Unless you are way up north you will not have problems with the sprag engaging and we never did, but the 80-90 solved about all of our gear pitting problems.

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Wrenchbender

04-18-2004 06:55:47




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 Re: Re: Re: Re: Re: Oliver 880 Torque problems in reply to Scott Green, 04-18-2004 04:04:32  
Thanks Scott, I knew the manual talked about draining the unit but not how much to put back in. That extra capacity is probably in the foot notes and I've overlooked it. WB.



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Jeff

04-18-2004 20:23:29




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 Re: Re: Re: Re: Re: Re: Oliver 880 Torque problems in reply to Wrenchbender, 04-18-2004 06:55:47  
I have an regular 88 that someone has put a power booster on and am having some problems with it as well. If I take off in low with the handle back it will run just fine like that although quie noisily. I can shove the handle forward and it will shift fine also. However if I pull back it will not engage until the tractor completly stops. I have adjusted the handle and all but that didn't help. I have an I & T manual on the tractors but it doesn't show a breakdown of the Power booster, just the Reverse-a-torque. What manual do i need for this exploded view?

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Scott Green

04-19-2004 02:28:56




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 Re: Re: Re: Re: Re: Re: Re: Oliver 880 Torque prob in reply to Jeff, 04-18-2004 20:23:29  
Jeff , one thing you might want to try. Take the cover off the power booster. Make shure the fork/throw-out bearing is clean , and not covered with dirt/dust , or anything else. Then put a light film of grease on the shaft in which the throw-out bearing slides back and forth on. Also put a little grease on pivot points/linkages. You will be surprised how much better things work. This is part of a yearly maintanence I do on my power booster drive. My power booster drive works very well. When I first bought the tractor , every now and then , I would experience the same symtoms as you.

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J. Schwiebert

04-18-2004 20:33:41




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 Re: Re: Re: Re: Re: Re: Re: Oliver 880 Torque prob in reply to Jeff, 04-18-2004 20:23:29  
You need a manual for a 770-880. Your sprag clutch is starting to fail. There is no adjustment for it.



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Bob C

04-19-2004 08:50:37




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 Re: Re: Re: Re: Re: Re: Re: Re: Oliver 880 Torque in reply to J. Schwiebert, 04-18-2004 20:33:41  
I have about 6 of these units in my parts. I find thats were they work best. However, if your wanting to make it work, than you can adjust it by adding or subtracting shims from the three shim packs that are located around the clutch pack. If your wanting to improve a failing clutch with half wore out clutch plates still in there, you need to remove the three shim packs and and remove three or four shims from each pack. Make sure there is an equal amount in each pack. If you have installed new clutch plates in unit, than you will need to add 3 additional .007 shims to each pack. The extra shims added when new clutches are installed should make your total shim pack about .148-.150 thick. When you get the unit together, start tractor, get a spring scale somewhere and check the pressure on your engaging lever. You should have between 35-50 lbs of pressure at lever knob to engaged the clutches. You may need to add or subtract a shim or two to reach this pressure.One previous post was also correct, in that you have to have unit lined up perfect. Sometimes you need to add a couple shims under rear engine mounts to properly alien unit.Also, overrunning clutch may be in backward. This is a possibiltiy for sure.These things can be a big time headache sometimes, but a good working one is handy for sure. Good luck

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J.Schwiebert

04-19-2004 13:50:11




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 Re: Re: Re: Re: Re: Re: Re: Re: Re: Oliver 880 Tor in reply to Bob C, 04-19-2004 08:50:37  
Bob: I got my start with Oliver in 1960 when they had the rebuild program for the power booster. There is no adjustment on the sprag clutch.



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Bob C

04-19-2004 19:59:06




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 Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Oliver 880 in reply to J.Schwiebert, 04-19-2004 13:50:11  
I have a thousand page master oliver shop manual,which covers fleetline, super series and three digit models, revised in Dec, 1st, 1960, which has a service bulletin update on power booster drives. The opening paragraph on power booster drive CLUTCH ADJUSTMENT discussion on page 7-52 reads, The power-booster drive clutch is an adjustable, over centre type and the clutch back plate is provided with three sets of shims as a means of adjustment. If you like, i can email you the entire service bulletin. Maybe we are talking two different things here,or am i getting confused and missing something here????

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Bob C

04-19-2004 20:20:08




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 Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Oliver in reply to Bob C, 04-19-2004 19:59:06  
Woops, after thinkin on this for a spell, i realize i misunderstood you John, SORRY!! Your talking about the one way clutch in the gear box. Im am referring to the over-centre dry clutch in the front part of the unit. This has the shims for adjustment on the lever. The one way sprague clutch in the gear box is indeed unadjustable. I wasnt aware that they gave a problem very much though. I always seemed to think most of the wear was in the over-centre clutches, release bearing and linkage. Again sorry, my mis-interpretation.

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Bob

04-19-2004 20:38:19




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 Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Ol in reply to Bob C, 04-19-2004 20:20:08  
Mitch, sorry if all this rambling of mine has you confused. If its any help to you email me and i can scan these pages and email them to you. It has pictures of the power booster drive schematic diagram in both engaged and disengaged positions. Also a complete discussion on the the configuration, operation, servicing procedures and trouble shooting. Would be much more benifit to you than my poor directions. Would be more than happy to send it out.

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