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single acting cylinder help

C

chrisfarmallf20

New User
I"m probably just stupid asking this as I couldn"t figure out right away this afternoon but we just bought a new Bush hog for our farmall 400 and it has a single acting hydraulic cylinder on it. The cylinder had a number of spacers on it. We hooked it up and can tell the hose is moving from the oil pressure but the cylinder had no movement. I removed one of the spacers and the cylinder shut further but no movement again heading to the "up" position. I cracked the line heading to the cylinder and could easily tell the line was getting pressure just no response from the cylinder. Is there some kind of bleeding procedure on a new cylinder I"m missing? I feel dumb posting this because I know I"m just missing something simple here. Thanks for any help!
 
Switch the hose to the other outlet.I'l bet you have it set to the 'oneway' setting.You are hooked to the 'down' hose.Or the plug is still in the other end of the cylinder.Its airlocked or hydrolocked.Remove thet plug ndd install a vented plug.
 
The 400 has an adjustment on top of the control valves behind the dash. The selector changes the function of the valve between single & dual acting. On a well used tractor, they're usually hiding under dirt & oil on top of the valve block(s). After you clean the valves, you'll see the selector I'm speaking of. You can use a 1/2" wrench to turn the selector, it moves in an arc from about 10 to 2 o'clock, when looking over the top of the valves toward the seat. There should also be a "S" & "D" in the casting the selector pokes out of. Also, wiggle the handle you've been using to figure out which valve to adjust, if you have more than one valve. Right, center & left levers are not connected to the valves in the same order, nor are the hydraulic lines from them. Anyway, once the valve is changed to single acting, the hydraulic fluid should flow back out of the cylinder to let the Bush Hog down. If your hooking into the hydraulic block on the side of the battery box, I think the hose goes in the bottom connector.

Hope this helps.

Mike
 
Sounds like the cylinder is set on pull for raising an implement and some ore made for a pull instead of push to raise it. Or could be someone took the second hose off to use someplace else when they broke one and that is the most likely thing. Look for a place to put a second hose on, may have a pipe plug in, take out that plugand either move the hose over or add a second hose and it should work, If as a single action with only one hose you need the weight of the implement to retract the cylinder and retract would be eiither together as with a normal setup extend to raise or a odball setup that it pulls to raise then the implement weight would extend the cylinder to lower.
 
I'll check the valve on the tractor. Thanks. I did try both outlets on the back of the tractor and I believe the one one the left is the proper one to use. also it is a new cylinder and it is a vented plug on the far end. I'm just wondering if it would be air bound. I'll remove the spacers to allow the cylinder to completely close and hopefully that will also purge out any air.
 
check if using the rear manifold if it has a check valve block on it as well. If your tractor ever had a fast hitch then it should have had a check valve which maybe didn't stay with the hitch. Not all check valves work with single acting cylinders.
You could probably put those same style check valves on the under tank ports too, so investigate what hardware you have.
karl f
 
It is not air locked, and when assembling they just put that vent plug where it was the easiest to put it. All cylinders need a load on for them to retract if they are set up with one hose, only the ones with 2 hoses can you test laying on the ground.
 
Not true. I removed the spacers on the cylinder and was able to push the ram back to the "down" position. It was hard the first couple of times but then it went easier...making me believe there may have been some trapped air in there. I checked the tops of the hydra-touch valves and they were set for dual-acting....so switched that to single-acting and hooked back up....tractor pushes the cylinder but not when the cylinder is hooked up to the bush hog...not enough power to lift it! Hmmmm....I thought....I checked the hydraulic reservoir and it is sitting right at the low mark. Of course I"m out of hydraulic oil so now off to tractor supply to buy a pail and fill it up, hoping this is the problem...because if not I"m guessing my pump is shot...ugh.
 
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