johndeeregreg
Member
hey everyone, i'm working on the power steering on my 820. it was leaking oil out where the steering shaft goes in so i had the worm housing and valve off. it hasn't steered the best since i got it last summer either, little to no help steering. it has the later style operating sleeve with out the set screw and the helix adjustment on the end of worm gear. while i had it off i took the steering worm shaft off the operating sleeve and noticed that the 2 cam pins were getting some flat spots so i turned both pins half a turn so they run on fresh surfaces. i did my best to get the operating sleeve end play set to .0015 ( kinda hard to get a dial indicator in there to get an accurate measurement and my indicator only goes to .000. i didn't change the shims for the worm gear end play and it seemed to be with in the .001-.004 range.
tonight i got everything put back on and was trying to adjust it here is what i got: ( i have a 3000 psi gauge in the pressure line like the book shows (lowest pressure i could find it the farm store))
tried to center steering valve hard to do by the gauge but got it so it is equally hard to turn each way and while turning each way the pressure on the gauge is with in 50-100 psi of each other.
with the valve where i have it now the highest pressure i can get is 500 psi ( i haven't tried adjusting relief valve yet and here is why: at one point i had the valve off center so it turned easy to the left and when the valve was in that position i got about 1100-1150 psi while holding the wheel all the way to the left.
also when i started making adjustments the first thing i had to do was turn the flow valve in so far that i don't think the cap will thread on any more to get the gauge to read any pressure to center the valve. at one point i thought i had it centered and backed out the flow valve to get 130 psi, while i was turning screw out the pressure was raising and dropping like the screw had a high spot or something that pushed the valve in when it came across a spot on the flow valve.
the correct John Deere power steering oil seemed to be foamy and there seemed to be some pressure in the reservoir when i took the dipstick out to check the oil level after the first time running it since assembly, i suppose my pump seals are leaking and sucking air?
so what does anyone think i should try next to get it working good in each direction and getting the pressure up where it should be? do i have an end play not adjusted right? kind of seems to me that the operating sleeve isn't moving far enough to move the valve as far as it should in each direction and i'm not sure what adjustment would solve that? the flow valve also has me kinda puzzled.
not sure if it has any affect on power steering operation but i did remove some of the shims that adjust worm gear back lash, pack was .078 and i took it down to .052 and it still seemed like the worm gear turned more that the book specified but i didn't want to get to carried away with changing that adjustment, it still turned free with out any tight spots.
i think my email is open if someone wants to talk me through it over the phone email me your number or send me an email and ill send you mine
tonight i got everything put back on and was trying to adjust it here is what i got: ( i have a 3000 psi gauge in the pressure line like the book shows (lowest pressure i could find it the farm store))
tried to center steering valve hard to do by the gauge but got it so it is equally hard to turn each way and while turning each way the pressure on the gauge is with in 50-100 psi of each other.
with the valve where i have it now the highest pressure i can get is 500 psi ( i haven't tried adjusting relief valve yet and here is why: at one point i had the valve off center so it turned easy to the left and when the valve was in that position i got about 1100-1150 psi while holding the wheel all the way to the left.
also when i started making adjustments the first thing i had to do was turn the flow valve in so far that i don't think the cap will thread on any more to get the gauge to read any pressure to center the valve. at one point i thought i had it centered and backed out the flow valve to get 130 psi, while i was turning screw out the pressure was raising and dropping like the screw had a high spot or something that pushed the valve in when it came across a spot on the flow valve.
the correct John Deere power steering oil seemed to be foamy and there seemed to be some pressure in the reservoir when i took the dipstick out to check the oil level after the first time running it since assembly, i suppose my pump seals are leaking and sucking air?
so what does anyone think i should try next to get it working good in each direction and getting the pressure up where it should be? do i have an end play not adjusted right? kind of seems to me that the operating sleeve isn't moving far enough to move the valve as far as it should in each direction and i'm not sure what adjustment would solve that? the flow valve also has me kinda puzzled.
not sure if it has any affect on power steering operation but i did remove some of the shims that adjust worm gear back lash, pack was .078 and i took it down to .052 and it still seemed like the worm gear turned more that the book specified but i didn't want to get to carried away with changing that adjustment, it still turned free with out any tight spots.
i think my email is open if someone wants to talk me through it over the phone email me your number or send me an email and ill send you mine