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Bobcat Skidsteer Forums
General Bobcat Skidsteer Forum
Stump grinder hydraulics
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<blockquote data-quote="Fishfiles" data-source="post: 36749" data-attributes="member: 782"><p>some cyclinders use a oring on the shaft which goes thru the piston and some don't , maybe the oil is leaking thru the the inside of the piston bore that slides over the chrome rod , I can't remember if those cylinders had that oring or not -------- I rebuilt all three cylinders on a stump grinder a few months back and got to use it to take out a bunch of stumps I had in the yard and it made fast work of it , no more than an hour to do about 12 of them in the 16 to 8 inch range , very nice attachment ---------------one way to test the seal on the piston is to remove both hoses from the cylinder and cap off the fittings and see if you can push the cylinder in or pull it out while it is capped or to make a fitting that will adapt to the fitting on the cylinder and hook it to an air supply and try and push air thru it or dead head the cylinder in one direction then take off and cap the out side of the way you are moving the cylinder , with the fitting on the out side opened apply pressure to the inside and see if oil is making it by the piston seal ---------maybe the controll valve spool is not centering due to corrision in the spring cap</p></blockquote><p></p>
[QUOTE="Fishfiles, post: 36749, member: 782"] some cyclinders use a oring on the shaft which goes thru the piston and some don't , maybe the oil is leaking thru the the inside of the piston bore that slides over the chrome rod , I can't remember if those cylinders had that oring or not -------- I rebuilt all three cylinders on a stump grinder a few months back and got to use it to take out a bunch of stumps I had in the yard and it made fast work of it , no more than an hour to do about 12 of them in the 16 to 8 inch range , very nice attachment ---------------one way to test the seal on the piston is to remove both hoses from the cylinder and cap off the fittings and see if you can push the cylinder in or pull it out while it is capped or to make a fitting that will adapt to the fitting on the cylinder and hook it to an air supply and try and push air thru it or dead head the cylinder in one direction then take off and cap the out side of the way you are moving the cylinder , with the fitting on the out side opened apply pressure to the inside and see if oil is making it by the piston seal ---------maybe the controll valve spool is not centering due to corrision in the spring cap [/QUOTE]
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Stump grinder hydraulics
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