John Deere 450C Blade Tilting Problems

doaks

New User
Hi All,

I recently purchased a John Deere 450C which was a great investment. There is one aspect of the machine that I could use some help finding a solution and that is the tilting function on the blade gets bound up from small debris like sand or dirt. This symptom occurs after short use and it is caused from the blade tilting sliders binding or getting gummed up. I could understand this if it was something big causing the blade from not rotating but it is not the case and a little frustrating. I have to power wash the area and with the machine running try and rotate it back and forth until these small debris are completely washed free.

I really could use some helpful advice on how to remedy this problem or others who have similar cases and what you did to solve the problem?

It is very critical for the blade to be able to tilt while trying to grade a slope.

Below is a picture of the blade tilting sliders.
 
Your packing on the tilt cylinder piston is about shot. Leaking by. It will tilt when clean and no pressure but not when loaded. The solution is rebuild the cylinder.
 

Thank you for your help. Just to make sure that I am clear on what your telling me since I am no expert in hydraulics or dozers. Are you saying that the cylinder used to tilt the blade is going bad or is bad and that it doesn't have enough force to tilt the blade? How can I verify that the cylinder is bad? I don't see any hydraulic fluid coming out of the cylinder would you expect to see something like this or is it just bypassing the cylinder and going into the other tube.

Is this an easy job to fix for someone who is moderately mechanically inclined? Do you know where I can buy the parts?

Thanks again for all of your advice and help.

David
 
The sliders on the blade may be too tight and getting
bound they usually have shims behind the plate for
wear. I would check before taking the piston off.
 

Is the another piece of material between the two metal pieces and the two metal pieces being the one with bolts and the other is the actual metal piece that moves from the hydraulics?
 
The other poster COULD be right but you should be able to look right at the wear plates and tell if they were too tight. Easy way to tell if a cylinder is bypassing internally is use a infra red heat gun. If the cylinder is leaking past the internal piston packing it will heat up. Passing in the cylinder piston will not show up as an external leak. The leak is just from one side of the piston to the other. Just think of it a jack that wont lift the car because the fluid is leaking inside. This is a pretty common experience with that tilt cylinder. Some one has hung it under a stump and strained it and once that fluid passes the cylinder seals it will always be weak. Barring some kind of mechanical binding there in the wear plates it will be the cylinder. You CAN take a grease gun and add grease right there to the tilt plates where you are digging that dirt out to see if it is friction problems.
 

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