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Oliver, Cletrac, Co-op & Cockshutt Tractors Discussion Forum
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Please help!!! Hydraulic trouble on 770

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John

11-28-2003 13:49:18




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My 770 has the standard hydra electric unit. I also have a power traction hitch. With snow comming, I decided to try her out (snowblower on back) I raised the 3 point but could not lower it!!! It clicks but will not lower. Now I hate to be a pessimist, But we're supposed to get 8" of snow tonight.... ANY ideas??? Thanks in advance!!!




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Scott Green

11-29-2003 10:32:48




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 Re: Please help!!! Hydraulic trouble on 770 in reply to John, 11-28-2003 13:49:18  
John , is your hydralectric hooked up? if so , try this. The lever which controls the 3-point can be moved straight up or straight down for hydralectric operation. Or , push control lever to outside , and then up or down for manual operation. You can pull fuses under dash , just above hydraulic reservor. This will not allow the hydro-lectric to work at all. It will run manually , no matter which way the hydraulic control lever is pushed. Did you install the power traction hitch your self? If so , it sounds like the side you plumbed into may be set up for single action. Or , you just plain have it plumbed wrong.

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Scott Green

11-29-2003 10:11:15




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 Re: Please help!!! Hydraulic trouble on 770 in reply to John, 11-28-2003 13:49:18  
john , I've been following this thread. Looks like you still have the problem. There are many ways to plumb the hydraulics. you can plumb both sides of the unit double , both sides single , right side double & left side single , left side doulble & right side single , etc. , etc.. Send me your e-mail. I'll send you back diagrams to plumb your set-up. Scott



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J. Schwiebert

11-29-2003 11:06:24




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 Re: Re: Please help!!! Hydraulic trouble on 770 in reply to Scott Green, 11-29-2003 10:11:15  
Take Scott up on his offer. There was good section in the shop manual devoted to how those units could be plumbed for different applications. Now safety first here, but two situations that I ran into years ago. If you do have a single acting cylinder this is highly unlikey but it is possiable. If all the oil in the reservoir was used to raise the cylinder it will not go down because it takes oil under pressure to knock the ball off the seat in the valve. So if you did not check your oil level first and it was low this could happen on a one way cylinder application.
Second, I seen one case where the little grove pin in the restrictor broke and left the restrictor plug move in to plug the opening. You were adjusting the restrictor but you really were not. If you are going to check this you MUST prop up the snow blower before you remove the restictor. SAFETY FIRST. When you try to lower the cylinder does your relief blow (chatter)? Do your cylinders have one or two hoses? If you do not have one way cylinders you should have only one adjustable restrictor on eash side of the unit and they are diagonally opposite each other. More than that I would start checking if it was set up for single acting and was not changed back.

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RAB

11-29-2003 07:31:16




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 Re: Please help!!! Hydraulic trouble on 770 in reply to John, 11-28-2003 13:49:18  
No problem if there is that much or more. You will hardly have to let any air out of the rear tyres to get most of it!! (Just hope they are not ballasted)!! Now tell us all how loooong your drive is!
Best of luck and regards, RAB



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J. Schwiebert

11-28-2003 16:30:54




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 Re: Please help!!! Hydraulic trouble on 770 in reply to John, 11-28-2003 13:49:18  
Man after 30 years I am trying to remember. You have an adjustment that controls the rate of drop. It is the swivel where the hose for the cylinder attaches to the outlet pipe on the unit. The other swivel should not have an adjustment. Here is what I am trying to remember. if you can turn that screw in so far that oil will not flow through it. Back it out about 3 turns maybe and see what happens. If nothing ask again.

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John

11-28-2003 18:16:56




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 Re: Re: Please help!!! Hydraulic trouble on 770 in reply to J. Schwiebert, 11-28-2003 16:30:54  
I played with the restricters but no luck... Could one side of the unit be 2 way hydraulic and the other side be just one way (in other words no "down pressure". Maybe I would have it hooked up wrong then.... Just started snowing.&^$!@#@!!!



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Nick

11-29-2003 04:10:49




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 Re: Re: Re: Please help!!! Hydraulic trouble on 77 in reply to John, 11-28-2003 18:16:56  
Check the couplers?



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J. Schwiebert

11-29-2003 09:00:26




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 Re: Re: Re: Re: Please help!!! Hydraulic trouble o in reply to Nick, 11-29-2003 04:10:49  
I agree with Nick, and it seams like when a coupler goes bad the implement will go up but not down. I thought of that after I sent you the first reply, however I do not remember us using couplers on the power traction hitch cylinder. Does the relief valve blow when you try to lower it?



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John

11-29-2003 09:10:54




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 Re: Re: Re: Re: Re: Please help!!! Hydraulic troub in reply to J. Schwiebert, 11-29-2003 09:00:26  
I've checked everything!!! My patience is just about done... On the top of my unit, There are only wires comming out of the right side wich makes me believe that maybe the left side is single acting??? If so, it wouldn't work with a hydra electric piston??? I love my 3 Ollies but this is aggrivating!!!!! Thanks for the help guys, I appreciate it. If I ever meet you, I'll buy you a beer..... John.

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J. Schwiebert

11-29-2003 09:15:06




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 Re: Re: Re: Re: Re: Re: Please help!!! Hydraulic t in reply to John, 11-29-2003 09:10:54  
Wait a minute, the power traction hitch ran off the right side and used a 4 inch hydra-lectric cylinder. That hydraulic unit will move a cylinder up or down no matter if the cylinder is set up for hydralectric or not . Why don't you describe how you are plumbed up a little better or put a phone number down or something.



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John

11-29-2003 11:14:48




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 Re: Re: Re: Re: Re: Re: Re: Please help!!! Hydraul in reply to J. Schwiebert, 11-29-2003 09:15:06  
I had the right side plumbed for the hitch. That gave me power up and down...no problem. When I hooked my new snowblower up I hooked up the two lines for the hydraulic chute swivel up to the left side... The piston went out but would not come in... I then switched sides and BINGO. The hitch went up but not down. I've worked on tractors for years and even built a few pulling engines, but this has me baffled. The only thing I can think is that the left side of my pump is single acting or in need of repair...Thanks again for all the help!!!!!

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J. Schwiebert

11-29-2003 12:41:37




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 Re: Re: Re: Re: Re: Re: Re: Re: Please help!!! Hyd in reply to John, 11-29-2003 11:14:48  
Find me on the Oliver-Hartparr web site. Send me a U2U with your phone number. Now you are making more sense to me. How many adjustments (adjustable restrictors)do you have on the left side?



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John

11-29-2003 13:28:57




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 Re: Re: Re: Re: Re: Re: Re: Re: Re: Please help!!! in reply to J. Schwiebert, 11-29-2003 12:41:37  
I set up the hydra cylinder on my hitch to act as a one way cyl. I now have that on the left. The weight of the hitch lowers it ok. The right side I now have the double acting chute cyl. on the right. That works in both directions ok. Sooo.... everything works. I noticed only one fuse and wiring on the right of the unit. I have one restrictor in front on the left and one in the rear on the right, just like pictured in the owners manual. I dont know if this is right but it works. I'm still curious if my pump could be single acting on the left or if it's screwed up. I'm not TOUCHING it, it WORKS. I really appreciate the help, and wouldn't you know it... It's STOPPED SNOWING!! (ever feel like Charlie Brown???) Thanks again, John.....

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J. Schwiebert

11-29-2003 16:17:27




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 Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Please hel in reply to John, 11-29-2003 13:28:57  
Where do you live that you were going to get 8 inches of snow? If you are running the Power traction hitch as a one way where does your other hose go? Send me an e-mail address and I will send you some information too.



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John

11-30-2003 07:35:18




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 Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Please in reply to J. Schwiebert, 11-29-2003 16:17:27  
I live about 25 miles south of Buffalo NY. I have the right side of the unit now running the chute cyl. On the left side I have it piped single according to the it mannual. First and third ports connected and the second port going to the lift cyl on the hitch. It works. As it turns out we only got 2". 20 miles south of me recieved about a foot!!!! Thanks for the help, John..



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Russell W. Cmejla

11-30-2003 17:16:08




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 Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Pl in reply to John, 11-30-2003 07:35:18  
John; You probably don't panic often but now you owe JS a 30 pack of beer for getting you on the strait and narrow of your hydraulic dilemma.
I just know you will reward your clear thinking
hydraulic troubleshootin' friend. Get back on your snow clearin' tractor and clean up a storm.



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John

12-01-2003 16:14:45




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 Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Re: Re in reply to Russell W. Cmejla, 11-30-2003 17:16:08  
I think I would have rather been covered in beer than hydraulic fluid!!!!1(ha ha ah)....John



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