Re: 1954 Ford NAA Hydraulic Back Pressure Valve

Posted by Wayne Hilburn on May 12, 2005 at 19:36:51 from (64.12.116.6):

In Reply to: Re: 1954 Ford NAA Hydraulic Back Pressure Valve posted by Wayne Hilburn on May 11, 2005 at 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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