Hydraulic cylinders

Kccca · Aug 18, 2016

I have a 3615 batwing bushhog brand mower. Double acting cylinders on the wings. When the wings are all the way down with the cylinders
fully extended, they will not retract. It acts like pressure is on the hose attached to the piston rod end of the cylinder. Switch hoses on tractor,
same thing. Even switch tractors, same thing. Tonight I loosened the hose at the end where the cylinder seal would be and applied pressure to
the hose where the oil was, and no oil comes out, thus no damaged seals. Any suggestions from anyone? I'll answer questions as we go.
Tractor is 2-105 white and 5400 john deere.

Determined · Aug 18, 2016

When fully extending is it possibly it is travelling over center and causing a mechanical bind?
If you extend it half way will it retract properly?

Kccca · Aug 18, 2016

As long as you don't extend all the way out, they will retract. I have not separated the two, so I don't know if it is one or both. Now I have them
all the way retracted, ie: wings up, and they would not go back down. The hose just jerks. I even loosened the hoses at the 'bottom' of the
cylinder while ago an no travel at all. Never loosened the other end, though. Got dark here.

Wheatfarmer · Aug 18, 2016

As stated below. Put a block (Blocks) under the edge of the wing. Stop the cyl when the wing touches. see if it will go back up. then do the same but run the cyl all the way out with the blocks still in place. This will tell you if it is the frame locking or the cyl locking. See if there is stop missing on the frame, or is it so the wing will float. Is there a problem or groove in the float part of the lifting arm.

Wheatfarmer · Aug 18, 2016

Be very careful with it dropping, but sounds like an airlock. With wing up loosen hose and with SOMETHING let wind down. Or better yet take end of cyl off and move it by hand.

Kccca · Aug 18, 2016

Got a come-a-long holding the wings up (raised) right now. Too many accidents through the years to get careless now in my ripe old age of ,67! 5 back surgeries, 3 shoulder, and one hip joints replaced. Other than that, I' m fine!
Thanks for the warning, and concern.

JD Seller · Aug 18, 2016

It sound like you tested the cylinders for leaking butting them DOWN not up. You need to loosen the hose on the base end or extend side. Then apply pressure on the rod end or retract side. The seal maybe only leaking in the one direction. Neighbor had a Bush Hog 3615 and I have had to rebuilt both wing cylinders in the last two years. It was doing the exact same thing as yours is doing. The cylinder was only leaking when retracted. So it was applying pressure on the base end through the leak when you tried to fold the wings.

Another problem I have had on these type of systems is that they have an orifice in one of the hoses to limit the speed that the bush hog will fold. This also makes it so the wing will not drop as fast if a hose breaks too. I have seen these orifice fitting get plugged or stuck and cause the issues your having too.

Determined · Aug 18, 2016

Sounds like you may have a badly worn or bent hinge pin on a wing, when fully extending or retracting it is getting hung up.

FWB in SK · Aug 18, 2016

Try new hydraulic tips. One could be bad. Happened to me. Sounds similar.

BushogPapa · Aug 18, 2016

Sounds like faulty Hydraulic ends...

showcrop · Aug 19, 2016

3X hose tips. Incompatibility can keep check valve in remote valve from opening so nothing can move.

Kccca · Aug 19, 2016

I guess this sounds dumb, but what do you mean by 3X hose tips? Are you saying there are 3 different kinds of hose tips? If so, what are the characteristics of each? The ones I have now are new, put on yesterday; they are pioneer round ball in the end. The female ends of the couplers have a pointed like valve in it that makes contact with the ball in the male end.
thanks for the reply.

showcrop · Aug 19, 2016

(quoted from post at 08:39:11 08/19/16) I guess this sounds dumb, but what do you mean by 3X hose tips? Are you saying there are 3 different kinds of hose tips? If so, what are the characteristics of each? The ones I have now are new, put on yesterday; they are pioneer round ball in the end. The female ends of the couplers have a pointed like valve in it that makes contact with the ball in the male end.
thanks for the reply.

3X refers to being the third one to make the same suggestion. When I first got my IH 990 mower conditioner it had ends that were incompatible with the valves on my tractor. I had to "feather" the handle to get the header to drop. lifting, it worked normally. After maybe two years someone told me about lack of compatibility, so I replaced the tips, and it worked properly. I don't know how many types there are but it seems that the problem occurs mostly with JDs. This comes up here at least once every other year.

Kccca · Aug 19, 2016

When I had the mower hooked to the JD, I had to 'feather' the joystick on it also. but now that it's hooked to the White, it will not work at all; although, it has worked by feathering it, but only did so once or twice. This weekend, I am going to hold the wings up with the loader on the JD, remove the cylinders and lay them on top of the mower or put them on the ground and see if they will work with no pressure on them whatsoever. Also would be a good time to check to see if they have check valves in the hoses or cylinder fittings. Hopefully get to the bottom of this soon.

Hydraulic cylinders

Kccca

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Determined

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Kccca

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Wheatfarmer

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Wheatfarmer

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Kccca

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JD Seller

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Determined

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FWB in SK

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BushogPapa

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showcrop

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Kccca

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showcrop

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Kccca

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