Hi all, Some time ago I purchased two hydraulic cylinders that I was told were phaser cylinders. These were explained to me as being of a type that when the piston travelled a certain distance up the cylinder that oil would bypass the piston. I think they are meant to be used in an application where a number of cylinders are lifting an implement to a certain height. I was told that upon dismantling the cylinder I would find a groove in the cylinder wall near the top of the stroke that would allow this bypass to occur and to disable this just add a spacer on top of the piston to prevent the piston reaching this groove. After dismantling the cylinder I can find no groove and am wondering if they really are phaser cylinders? Can anyone give me a clue how to identify these cylinders correctly? Thanks, Bill
Originally posted by Willsway: Hi all, Some time ago I purchased two hydraulic cylinders that I was told were phaser cylinders. These were explained to me as being of a type that when the piston travelled a certain distance up the cylinder that oil would bypass the piston. I think they are meant to be used in an application where a number of cylinders are lifting an implement to a certain height. I was told that upon dismantling the cylinder I would find a groove in the cylinder wall near the top of the stroke that would allow this bypass to occur and to disable this just add a spacer on top of the piston to prevent the piston reaching this groove. After dismantling the cylinder I can find no groove and am wondering if they really are phaser cylinders? Can anyone give me a clue how to identify these cylinders correctly? Thanks, Bill
If cyl is connected to system, Extract cyl all way out, disconnect the rod end hose, and activate extract on control valve, then oil should leak out thru disconnected hose....do the same thing the other way if needed.... if cyl not connected, pull rod out by hand and use air pressure at capped end port......and vice versa.....
Per A aw come on.....force makes it go....or slow....
Posts: 237 | Location: Port Angeles WA USA | Registered: 24 September 2008
Do exactly as AKKAMAAN sugested, or skip right to the air step, just be sure not to stand in front of the rod.
There are a few ways to have cylinders bypass at the end of their strokes, some will have poppets in the piston that unseat when they hit the end cap, some have two ports that are connected on the outside of the tube under the port weldment, or sometimes they are connected through a small hole drilled parallel in the tube wall.
Thanks for your help on this - I have disassembled both and found no bypass in either. Mind you both of your methods avoids disassembly - oh well!! Thanks Doug for your explanation of the different types of bypass. I have since contacted my supplier and they have said that they are phasing cylinders, but if they were to be the last in a group they would have no bypass facility - I think this makes sense?? Bill
