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66 rowcrop help please!

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Butch Griffin

03-25-2002 05:41:42




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I have a 1950 66 rowcrop,it has a #1 hydralectric lift unit. I can't stop it from leaking into the tramsmission. I have replaced the seals(4) and the "0" rings & repaired a crack in the center housing. I've pulled it apart 3 times, each time thinking I had solved the problem. The pressure relief valve also seems to be working. It does not have the original switches. The original wiring was gone and there is no wiring to the cylinder so there are no stops working on the cylinder.I currently have it wired with a return to center toggle. It all seems to work ok except it's blowing by somewhere into the transmission....fast...2-3 quarts an hour.Can anybody help? Sorry for the length of this post,tried to get as much pertinent info out as possible. Please post or e-mail if you can help. Thanks!

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Jeff

03-25-2002 09:28:43




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 Re: 66 rowcrop help please! in reply to Butch Griffin, 03-25-2002 05:41:42  
Butch, the 4 seals you replaced were the ones on the hydraulic pump shaft? And the o-rings I'm guessing were the ones on the top of the pump, sealing the pump to the hydraulic housing? I think your best bet is to yank the hydraulic housing off and go over it with a fine tooth comb. Those hydraulic pump shaft seals should be new and not leaking, o-rings on the top of the pump new, check for any cracks on the bottom of the housing, replace all the 0-rings on the bottom of the control valves, and then just make sure the outside housing cover is sealed well either with a new gasket or with RTV sealant. Also replace the oil filter if you didn't already. Something you may try to locate any cracks in the housing is, when the pump is off, plug one of the pump holes in the housing and then blow compressed air into the other one. If there's a crack somewhere it will show up right away. I would do the same to the hydraulic pump and see if there's any leaks on it somewhere. One other thing, is your hydraulic pump rebuilt? If it is, then your pressure relief valve shouldn't need any shims, if it is set too high, it will blow your hydraulic hoses. Hope this helps some. Jeff.

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Shadetree

03-25-2002 09:38:22




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 Re: Re: 66 rowcrop help please! in reply to Jeff, 03-25-2002 09:28:43  
Jeff is right for the most part but that pump is designed for a maximum of 1200 psi and if you exceed that it will split the pump body because it is the weakest link in the chain. The hoses are made to take 2000 to 3000 psi way over what the pump can handle. Be careful not to exceed 1200psi. Good Luck Shadetree.



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Butch

03-25-2002 13:46:01




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 Re: Re: Re: 66 rowcrop help please! in reply to Shadetree, 03-25-2002 09:38:22  
Thanks guys, The pump is the only part I did'nt rebuild. I guess I'll start from the begining on the pump & unit as I should have from the outset. But when I realized the leak and pulled it down I found one of the shaft seals missing & the crack in the center housing. Ordered new seals and o rings and then gently spread the housing apart, silver soldered inside the cracks & then welded the outside to help keep it together. (My skills are not bad at that.) That seems to be working pretty well. Thought that would take care of my problem.....guess not. After yesterday I had already figured on pressurizing the base & the pump seperately to see where it blows by. Oil is going away fast. Thanks for the input, I'll probably be back.

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Shadetree

03-26-2002 03:33:51




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 Re: Re: Re: Re: 66 rowcrop help please! in reply to Butch, 03-25-2002 13:46:01  
Butch Im sure your skills at welding and soldering are good, the pressures from the pump can easily overcome such a repair and I'm afraid the only cure for your cracked center plate is a new center plate or a new pump and to make sure that the releif valve does not exceed 1200psi in fact I would set it at 1100psi if it were mine. Always better safe than sorry. Good Luck Shadetree.



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Jeff

03-26-2002 10:27:35




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 Re: Re: Re: Re: Re: 66 rowcrop help please! in reply to Shadetree, 03-26-2002 03:33:51  
Shadetree, they must have made some weak hydraulic hoses in the older days then. I think the newer hoses they have reinforced with like a steel mesh. Added a hydraulic system to my dad's 88 and when we tried it, it blew the hoses. I don't think the new hoses will blow. Jeff.



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Shadetree

03-26-2002 16:40:54




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 Re: Re: Re: Re: Re: Re: 66 rowcrop help please! in reply to Jeff, 03-26-2002 10:27:35  
Jeff I'm not sure if the older hoses were of a lesser pressure rating or not. However the pump in these old tractor like the 66 are of a small volume and low pressure settings I just looked up the pressure setting for the 66 and it is no less than 1000 and no more than 1100 psi. I can not find the gallons per minute flow of the pump but if memory serves me right I think the only had a 7 gal. per minute full flow capacity. So I would venture to guess that the hoses also had a low pressure rating to match the pumps of the times too. I hope this helps and Good Luck Jeff. Shadetree.

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