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Ford 9N, 2N & 8N Discussion Forum
Show Parts for Model:

1954 Ford NAA Hydraulic Back Pressure Valve

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Wayne Hilburn

05-11-2005 18:05:12
172.208.239.235



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I have done some damage to the Back Pressure valve in my tractor. Ive been told that the part is not made anymore. The valve still works, however, the tube is twisted off. Has anyone succesfully attached a tube to repair this valve? Is the Tube important? I am looking for options, as well as, a possible salvage solution.
Thanks,
Wayne




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Wayne Hilburn

05-12-2005 18:26:30
172.169.144.78



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 Re: 1954 Ford NAA Hydraulic Back Pressure Valve in reply to Wayne Hilburn, 05-11-2005 18:05:12  
I did order a replacement valve assembly, but.....
As an interim to get some use out of the tractor this weekend.
Today I cleaned the threads on the all-thread pipe and installed the valve assembly; careful to turn the discharge side of the valve downwards. I then removed the cover holding the dipstick. After observing the rubber washer and valve connection I felt that everything seemed fine, so I put the cover back on. I left the acorn nut off the side of the tractor so that I could see it operate when the lift was operational. I then cranked the tractor. I left the draft lever in the vertical position, and actated the control valve up and down. The lift came up and down just fine. I then threw the draft lever to the horizontal position. As I moved the control valve out of the up position, the arms started down. At this point, everything seemed fine.
However.....
I went and hooked to a small disk. The lift wouldnt lift the disk off the ground. I tried the draft control, and multiple configurations of the control valve with the draft control valve. Prior to this point, I checked the adjustments for the control valve (to the best of my ability) and I made no changes, because they appeared to be in spec. I changed the o-rings on the piston, upper cap assembly, and the upper seal above the piston housing. I checked the pin that prevents the cylinder from coming out too far, and it appeared ok. Also, I took out the unloading valve and replaced the o-ring on it. I went to Napa, a couple of weeks ago, to buy hydraulic fluid. I dont know the viscosity of the fluid; but is is more the consistancy of motor oil than gear oil.
I know the pump is working fine because it has been consitantly blowing the cylinder housing upper gasket, but I replaced it last weekend, and I rechecked it today before I put everything back on.
Any recomendations.
Thanks,
Wayne

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ZANE

05-11-2005 18:55:52
205.188.117.133



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 Re: 1954 Ford NAA Hydraulic Back Pressure Valve in reply to Wayne Hilburn, 05-11-2005 18:05:12  
If the valve still can produce back pressure the condition of the tube is unimportant.

The big O ring against the cylinder housing must be sealing good though for it to work.

Zane



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Wayne Hilburn

05-12-2005 19:36:51
64.12.116.6



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 Re: 1954 Ford NAA Hydraulic Back Pressure Valve in reply to Wayne Hilburn, 05-11-2005 20:22:35  

I reposted because I replied out of order. I did order a replacement valve assembly, but.....
As an interim to get some use out of the tractor this weekend.
Today I cleaned the threads on the all-thread pipe and installed the valve assembly; careful to turn the discharge side of the valve downwards. I then removed the cover holding the dipstick. After observing the rubber washer and valve connection I felt that everything seemed fine, so I put the cover back on. I left the acorn nut off the side of the tractor so that I could see it operate when the lift was operational. I then cranked the tractor. I left the draft lever in the vertical position, and actated the control valve up and down. The lift came up and down just fine. I then threw the draft lever to the horizontal position. As I moved the control valve out of the up position, the arms started down. At this point, everything seemed fine.
However.....
I went and hooked to a small disk. The lift wouldnt lift the disk off the ground. I tried the draft control, and multiple configurations of the control valve with the draft control valve. Prior to this point, I checked the adjustments for the control valve (to the best of my ability) and I made no changes, because they appeared to be in spec. I changed the o-rings on the piston, upper cap assembly, and the upper seal above the piston housing. I checked the pin that prevents the cylinder from coming out too far, and it appeared ok. Also, I took out the unloading valve and replaced the o-ring on it. I went to Napa, a couple of weeks ago, to buy hydraulic fluid. I dont know the viscosity of the fluid; but is is more the consistancy of motor oil than gear oil.
I know the pump is working fine because it has been consitantly blowing the cylinder housing upper gasket, but I replaced it last weekend, and I rechecked it today before I put everything back on.
Any recomendations.
Thanks,
Wayne

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