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In Reply to: Case 580B Main Boom slowly lowers posted by tim hon on Monday, May 14, 2018:
Leave the valve as it is very unlikely that it's the trouble,have you now stopped the gland from leaking,that is the only part that has a wiper seal and it is used to wipe the rod when it's retracted,the seals on the piston if you have a one piece piston it has two fibre wear rings that are split,in the middle you have the main pressure seal in two pieces,a square back up ring and a flat sealing ring,it is most important that those rings are fitted correctly,the square goes on first,you must not let that ring twist,it must go on the way it comes,the flat ring that goes outside it is not easy to put on without damaging it,some has an Z shape joint in the and you could stretch it that little bit to get it in the groove,if it does not have the Z cut in it you have to prise it over gently,soak in in hot water for a few minutes,use some hydraulic oil to help slip it on,now get a clear plastic bottle that will be a tight fit over the piston,cut a section out and put it on the piston to squeeze down on the seal to help you get the piston into the cylinder,don't forget if the machine has two boom cylinders an internal leak in either one will cause it to drop.
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