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d7 17a hydraulic blade tilted

d7 17a hydraulic blade tilted

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woodyorion
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Hi guys,
Hey finally got the old girl running and after pushing for a while, the right side of the blade dropped down about 8-12 inches lower then  the left side.  The tractor has hydraluic up and down but no hydralics on the blade for tilt or anything. It has an angle on both sides from push arm to top of blade that can be turned, and then at the bottom of the push arms to the bottom of the blade on both sides with like a trunion connection.  Could the arms possibly need to be turned to take this out of the blade? now when you push you dig a swale on the right side.
thanks for the help in advance

Rich
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Wed, Nov 27, 2024 5:30 AM
Busso20
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Woodyorion, would you be able to put up a couple of pictures for us, yes some of the crew love pictures,
I would suggest if one side is hanging it could be seals in one cylinder have failed, it will move up and down only due to the bracing in the blade system making it happen, if you remove one cylinder at a time from blade end and cycle the up and down the blade should technically lift off the ground or push into the ground raising machine, the one that does not try to lift or push down is the issue, the detached cylinder will cycle easy as no load against it. Sounds like the right side hanging lower is the problem cylinder.
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Wed, Nov 27, 2024 6:26 AM
Deas Plant.
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Location: Currently - DowNunda.
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Reply to Busso20:
Woodyorion, would you be able to put up a couple of pictures for us, yes some of the crew love pictures,
I would suggest if one side is hanging it could be seals in one cylinder have failed, it will move up and down only due to the bracing in the blade system making it happen, if you remove one cylinder at a time from blade end and cycle the up and down the blade should technically lift off the ground or push into the ground raising machine, the one that does not try to lift or push down is the issue, the detached cylinder will cycle easy as no load against it. Sounds like the right side hanging lower is the problem cylinder.
Hi, woodyorion.
If this is, as you say in your post title, a 7A blade, complete with C-frame and angle/tilt braces, I suspect that the problem will be in the tilt braces on top of each angle brace. Are they locked in position with the 'T' bars placed in the retaining loops in the back of the blade or are they free to rotate as you work? As old as this machine is, do they even rotate any more?

I have seen a couple of those tilt braces in which the rear 'eye' has pulled out of the rear end of the brace and is free to slide in and out as you work.

Just my 0.02

You have a wonderful day. Best wishes. Deas Plant.

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Wed, Nov 27, 2024 7:42 AM
woodyorion
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Reply to Busso20:
Woodyorion, would you be able to put up a couple of pictures for us, yes some of the crew love pictures,
I would suggest if one side is hanging it could be seals in one cylinder have failed, it will move up and down only due to the bracing in the blade system making it happen, if you remove one cylinder at a time from blade end and cycle the up and down the blade should technically lift off the ground or push into the ground raising machine, the one that does not try to lift or push down is the issue, the detached cylinder will cycle easy as no load against it. Sounds like the right side hanging lower is the problem cylinder.
Yes I will get some pics on friday and post them.  IF the piston failed, would I see leaking?
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Thu, Nov 28, 2024 7:37 AM
woodyorion
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Reply to Deas Plant.:
Hi, woodyorion.
If this is, as you say in your post title, a 7A blade, complete with C-frame and angle/tilt braces, I suspect that the problem will be in the tilt braces on top of each angle brace. Are they locked in position with the 'T' bars placed in the retaining loops in the back of the blade or are they free to rotate as you work? As old as this machine is, do they even rotate any more?

I have seen a couple of those tilt braces in which the rear 'eye' has pulled out of the rear end of the brace and is free to slide in and out as you work.

Just my 0.02
Yes I have the arms actually now that you say it on the left side or the side that is staying up, there is a rod through the top on a cage like on the blade to keep from turning and the low side does not have one. I was going to try and bring a big pipe wrench and try turning it. I will get pics on friday

thanks
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Thu, Nov 28, 2024 7:39 AM
Busso20
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Reply to woodyorion:
Yes I have the arms actually now that you say it on the left side or the side that is staying up, there is a rod through the top on a cage like on the blade to keep from turning and the low side does not have one. I was going to try and bring a big pipe wrench and try turning it. I will get pics on friday

thanks
Woodyorion, if the seals are damaged due to age, wear, etc it will leak internally from one side of the piston to the other, if you detach it from blade, it will move as per normal,
with weight of blade it will lift then lower as soon as hydraulic pressure is stopped, it will go to resting position, (the ground)
pushing blade into ground to raise machine will do the same (machine will rest on ground again)

External leak will only show if dust seal and rod pressure seals have failed in cylinder head. From your description it seems like piston seals have failed or bracing on blade requires lots of adjustment to lift corner up again. hopefully this helps
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Thu, Nov 28, 2024 3:55 PM
Ray54
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Reply to Busso20:
Woodyorion, if the seals are damaged due to age, wear, etc it will leak internally from one side of the piston to the other, if you detach it from blade, it will move as per normal,
with weight of blade it will lift then lower as soon as hydraulic pressure is stopped, it will go to resting position, (the ground)
pushing blade into ground to raise machine will do the same (machine will rest on ground again)

External leak will only show if dust seal and rod pressure seals have failed in cylinder head. From your description it seems like piston seals have failed or bracing on blade requires lots of adjustment to lift corner up again. hopefully this helps
If the seals have failed on one ram, if you cycle the blade up and down a dozen times or so the oil by passing the seal should cause enough friction that the barrel will feel warmer to the touch than the other one. This type of failure will not leak on outside the ram. All internal.
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Thu, Nov 28, 2024 11:02 PM
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