ebinmaine 67,317 #1 Posted December 19, 2021 On my 1975 C160 hydro the lift control DROPS the plow if I pull gently to UP direction. If I pull further into the range of the control it goes up fine. Can't imagine that's normal. What do I need to look at or replace? Share this post Link to post Share on other sites
wallfish 16,986 #2 Posted December 19, 2021 32 minutes ago, ebinmaine said: What do I need to look at or replace? The control valve Oil is bypassing a seal somewhere or somehow to allow it to go down. Or hold it in that "sweet spot" for float action 1 Share this post Link to post Share on other sites
ebinmaine 67,317 #3 Posted December 19, 2021 4 minutes ago, wallfish said: The control valve Oil is bypassing a seal somewhere or somehow to allow it to go down. Or hold it in that "sweet spot" for float action That's what I was figuring. Are the controls rebuildable? Parts source? Share this post Link to post Share on other sites
wallfish 16,986 #4 Posted December 19, 2021 Yeah. Typically just O rings on a rod. Lowell might have a kit on his site 1 Share this post Link to post Share on other sites
ebinmaine 67,317 #5 Posted December 19, 2021 11 minutes ago, wallfish said: Yeah. Typically just O rings on a rod. Lowell might have a kit on his site He did. I ordered one. THANKS!! 2 Share this post Link to post Share on other sites
pfrederi 17,681 #6 Posted December 19, 2021 (edited) The Control valve for my D200's FEL Does the same thing for the lift...If you ease it in to lift the bucket will settle a bit first. Took the valve to hydro repair place he said nothing wrong with it they just work that way... Sort of a break before make electrical switch Edited December 19, 2021 by pfrederi 1 Share this post Link to post Share on other sites
pfrederi 17,681 #7 Posted December 19, 2021 Eric Does your control valve look like this one? If so you will need a very very small snap ring pliers. Share this post Link to post Share on other sites
pfrederi 17,681 #8 Posted December 19, 2021 I just noticed you have that big very heavy blade on the tractor. Does the lift hold it up OK?? If it does i do not think new cup seals (They are not O rings in the type valve i pictured) will resolve your issue. If the seals were faulty the blade wouldn't hold in the up position. Share this post Link to post Share on other sites
roadapples 6,983 #9 Posted December 19, 2021 Be very careful replacing those o rings. Very easy to "nick"... 1 Share this post Link to post Share on other sites
ebinmaine 67,317 #10 Posted December 19, 2021 5 hours ago, pfrederi said: Eric Does your control valve look like this one? If so you will need a very very small snap ring pliers. I'll snap a pic. 5 hours ago, pfrederi said: .If you ease it in to lift the bucket will settle a bit first This one doesn't settle and stop. It keeps falling if I hold the UP direction part way. It DOES work fine if I go more into the lever. And it seems to hold the plow fine but I haven't held in the air long. Share this post Link to post Share on other sites
Handy Don 12,170 #11 Posted December 19, 2021 The control valve I have ('94 520) does not have check valves to "hold" the cylinder position when the control is centered. It relies on the spool seals. I suspect yours does too (check valves back in the day added a lot to the cost of valves!) Without check valves, as you shift the valve toward "up" it opens the shaft/retract side of the cylinder (B) port to pressure but there is already pressure in the control because of the suspended weight of the plow/blower. Most likely the seal at the end of the spool separating the spool's B outlet port and the reservoir (T) port is letting that pressure out because it's either out of place, worn, or damaged. When you move the lever far enough, the damaged part of the seal is no longer in a position to leak, letting you raise the lift. 1 Share this post Link to post Share on other sites
ebinmaine 67,317 #12 Posted December 19, 2021 6 hours ago, pfrederi said: Eric Does your control valve look like this one? If so you will need a very very small snap ring pliers. Here's a few pics of the C-160 control valve. 1 Share this post Link to post Share on other sites
pfrederi 17,681 #13 Posted December 19, 2021 Not sure if yours is the same inside. Just hope it is easier for you to deal with the istsy bitsy snap ring and get it together with out nicking the new cups... I had to reseal one of mine as it leaked pretty badly. i have not noticed the sagging on my plow tractors...but I usually only use full up or full down. Also my plows are not as heavy as yours that may be a part of your issue... Hope the new seals work 1 Share this post Link to post Share on other sites
ebinmaine 67,317 #14 Posted December 19, 2021 1 hour ago, pfrederi said: plows are not as heavy as yours that may be a part of your issue... Hope the new seals work Thanks Paul. Me too. It isn't the weight though... It does it without the plow blade on too. Share this post Link to post Share on other sites
