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Oliver, Cletrac, Co-op & Cockshutt Tractors Discussion Forum
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550 Hydraulic Leak

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Phil - MO

12-08-2003 05:11:32




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Decided to haul in some large bales over the weekend.
After adding 11 quarts of hydraulic fluid for two bale trips in a 9 quart reservoir, you don't have to hit me over the head to figure out I have a leak.
The three point hitch has been hiccuping for some time.
Can the o-rings in the lift cylinder blow out, or should I look for something else when I pull the pump under the seat.
Not looking forward to doing this in the winter.
By the way, how heavy is the pump assembly.
One side note, since I now have 11 extra quarts in the transmission, where is the check level drain for the transmission?, (seems I remember it is by the pto shaft).
I guess I need to drain the transmission and add what weight transmission oil?
I have the IT repair manual, but it seems to leave a lot of info out, like what what weight gear oil to use in the transmission.
Phil

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Paul

12-08-2003 10:17:48




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 Re: 550 Hydraulic Leak in reply to Phil - MO, 12-08-2003 05:11:32  
Just went through this same problem on a 55 Super. Had an "O" ring on the pump casing blow and pumped the oil into transmission. Ends just parted enough to let pressure off and pump out as arms stilllifted and kept getting slower until would not lift. Had to lift off with chainfalls and slings. Replaced all "O" rings and even removed non ajustable relief valve and cleaned out 45+ years of something black grit and even replaced "O" ring in lift cylinder. Works better than it ever did for me since the upgrade. Need 5 gallons of new 80/90 gear oil to repalce rearend and transmission fluids. Not a big job just time consuming. Good Luck Paul

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J. Schwiebert

12-08-2003 05:55:18




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 Re: 550 Hydraulic Leak in reply to Phil - MO, 12-08-2003 05:11:32  
Check plug for the transmission is by the PTO. It is a small pipe plug. When you drain the transmission and final drive, you will find there is more than one plug to drain the oil out of but you only need to check at the one place. How much do you use it in the winter? We always used 80-90 gear oil.
On the leak, Yes I would change the O-rings on the piston as well as the ones between the valve and the piston plus all the other O-rings.
We lifted many of them off by hand with two guys.One behind the tractor the other one would lift in the filter area. Then once we got it half way back the guy in front would go to the back to help. We then had a little cart we would lay the unit on and it was wide enough we go roll it over then take the pan off and work on the unit. Hope this helps. Questions?

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Phil -- MO

12-08-2003 06:09:51




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 Re: Re: 550 Hydraulic Leak in reply to J. Schwiebert, 12-08-2003 05:55:18  
Thanks for the information.
The only other thing, is there a pressure check, or how do I check for leaks after it is off.
Could the case be cracked?
Seems like the reservoir was pumping empty hauling in one bale.
I checked oil pressure awhile back (before the leak), and it seemed to be OK.
Phil



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tucker

12-08-2003 08:44:44




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 Re: Re: Re: 550 Hydraulic Leak in reply to Phil -- MO, 12-08-2003 06:09:51  
you might want to take the pump apart if it was running dry and check to make sure that it is not scored any, i had that ran dry and it scored it up a little cause low pressure. Hoe that is not the case new pumps are 200-300 dollars. If you use a comealong and a short chain or too you can take the houseing off by yourself.



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jake

12-08-2003 06:55:57




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 Re: Re: Re: 550 Hydraulic Leak in reply to Phil -- MO, 12-08-2003 06:09:51  
The lift hydraulics are all enclosed with the pan on the bottom, a bad O ring will not cause loss of fluid. If the pump front seal were bad oil would leak from the clutch housing. On the bottom of the pan the inlet adapter [69 in I&T] is the only part if damaged would cause fluid to the trans/rearend. Check the plug that was removed to check pressure is tight that would result in the rapid fluid loss.

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Phil -- MO

12-08-2003 07:18:52




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 Re: Re: Re: Re: 550 Hydraulic Leak in reply to jake, 12-08-2003 06:55:57  
I guess I'm going to have to wait until I remove the pump to see what is wrong. I'll have to wait until I get time, the farm is 100 miles away.
I checked the pressure earlier with the auxiliary hydraulics and I checked for a leak there.
With the 11 quarts I added plus what was already in the reservoir, we are talking 3 or 4 gallons.
I would have seen it leaking outside.
It has to be going into the transmission, but I'll admit I didn't check the level in the trans. I was too busy trying to get the old John Deere going to haul the hay in.
Hope the pan isn't cracked?
Could it be going through the lift cylinder?
Phil

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J. Schwiebert

12-08-2003 08:57:17




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 Re: Re: Re: Re: Re: 550 Hydraulic Leak in reply to Phil -- MO, 12-08-2003 07:18:52  
You are testing my memory. But there is a pan that contains the fluid. I have never had the problem where the bearing and the front seal went out of one of those little Vickers pumps and all the oil went past the pump. How ever I had one case where there was a hole in the pan. On the bigger tractors when that happens there is usually an axle bearing out and the bull gear has rubbed a hole in the pan. I am trying to remember how close the pan is to the bull gears.

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tucker

12-08-2003 09:18:47




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 Re: Re: Re: Re: Re: Re: 550 Hydraulic Leak in reply to J. Schwiebert, 12-08-2003 08:57:17  
the pan is not very far from the gears.



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