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Which cylinder is not providing hydraulic pressure

Which cylinder is not providing hydraulic pressure

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Cobalt Kid
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Gentlemen,

The snow has finally left and I am back to working on my D4 Trackcavator. My question is this. Only one of my dump cylinders for my bucket work. How do I tell which one does? My theory is that the one that is working extends and retracts first. Would this be a correct assumption. Any help would be appreciated, as I do not want to tear apart the wrong one, and they are heavy and hard to handle by hand.

Cobalt Kid.
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Sat, May 25, 2013 2:30 AM
old-iron-habit
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When you say not working does that mean that the bucket tilt settles or does not hold possition as if one cylinder has the internal piston leaking and is letting oil bypass. An easy test is to chain the bucket so it can only tilt halfway and try to tilt it against the bypass. Unless it is a catastrophic leak the barrel will get warm quickly in the center where the piston is letting leaking hyd fluid past.
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Sat, May 25, 2013 3:33 AM
Cobalt Kid
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Reply to old-iron-habit:
When you say not working does that mean that the bucket tilt settles or does not hold possition as if one cylinder has the internal piston leaking and is letting oil bypass. An easy test is to chain the bucket so it can only tilt halfway and try to tilt it against the bypass. Unless it is a catastrophic leak the barrel will get warm quickly in the center where the piston is letting leaking hyd fluid past.


Old-iron-habit,

Thank you for the reply, and yes you are correct to say that it does not hold postion( slowly tilts forward when bucket is full), although it does move it's full range of rotation.
So let me get this straight. I should chain the bucket so as to tilt only halfway and apply downward pressure with the control level and get a helper to feel the barrel for warmth. What about the one that is normal, what happens to it, will there be a possibility of blowing the outer seal.

Please reply,
Cobalt kid
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Sun, May 26, 2013 11:04 PM
old-iron-habit
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Reply to Cobalt Kid:


Old-iron-habit,

Thank you for the reply, and yes you are correct to say that it does not hold postion( slowly tilts forward when bucket is full), although it does move it's full range of rotation.
So let me get this straight. I should chain the bucket so as to tilt only halfway and apply downward pressure with the control level and get a helper to feel the barrel for warmth. What about the one that is normal, what happens to it, will there be a possibility of blowing the outer seal.

Please reply,
Cobalt kid
Yes. If it settles forward it will be better to tie the bucket in the semi tilted position so you can put pressure on the side of the cylinder that tilts it back to level. Many seals on the internal piston will leak only in one direction. The pump should bypass with out blowing the other cylinder. If not it would blow a seal or kill the engine every time you went to the end of the piston stroke. If it settles fast you may be able to tell with only partial throttle. If you have a stethoscope available or even a hollow conduit piece to listen through you can often hear the oil bypassing the seal also. Good luck.
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Sun, May 26, 2013 11:53 PM
ccjersey
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You may have to isolate the cylinders by capping the ports and lines off to be completely sure if it is the left cylinder or the right, or even if it's the valve that's leaking. We recently went through this same process on a skid loader. Repacked a cylinder and still or soon had the problem with it leaking down again, so repacked the other one and that didn't fix it. Then capped the ports of one cylinder and the lines to it and discovered it was leaking by the piston seal. When we opened it up again, we discovered the opening to the port was sharp edged and when the piston with the new seal was slid by the port, it cut the lip of the new seal. A few strokes with a dremel tool and a new seal fixed that.

Whatever you do, stay safe!
D2-5J's, D6-9U's, D318 and D333 power units, 12E-99E grader, 922B & 944A wheel loaders, D330C generator set, DW20 water tanker and a bunch of Jersey cows to take care of in my spare time😄
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Mon, May 27, 2013 4:02 AM
catsilver
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Reply to ccjersey:
You may have to isolate the cylinders by capping the ports and lines off to be completely sure if it is the left cylinder or the right, or even if it's the valve that's leaking. We recently went through this same process on a skid loader. Repacked a cylinder and still or soon had the problem with it leaking down again, so repacked the other one and that didn't fix it. Then capped the ports of one cylinder and the lines to it and discovered it was leaking by the piston seal. When we opened it up again, we discovered the opening to the port was sharp edged and when the piston with the new seal was slid by the port, it cut the lip of the new seal. A few strokes with a dremel tool and a new seal fixed that.

Whatever you do, stay safe!
The easiest way to check has already been covered, work he lever both ways for a bit and the one that gets warmest is the one with the leak.
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Tue, May 28, 2013 2:19 AM
Cobalt Kid
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Reply to catsilver:
The easiest way to check has already been covered, work he lever both ways for a bit and the one that gets warmest is the one with the leak.
Gentlemen,

Thank you for the replys, I will try your solutions as soon as I can, work has been busy, so I can't give that up. Got to pay for my hobby somehow.


Thanks again,
Cobalt Kid
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Thu, May 30, 2013 7:41 PM
drujinin
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Reply to Cobalt Kid:
Gentlemen,

Thank you for the replys, I will try your solutions as soon as I can, work has been busy, so I can't give that up. Got to pay for my hobby somehow.


Thanks again,
Cobalt Kid
No one mentioned the valves leaking until ccjersey told you to test one cylinder at a time by isolating each for test. Then he mentioned it may also be in the valves. I agree that it probably is in the valve body.
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Thu, May 30, 2013 11:41 PM
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