john.k
Diamond
- Joined
- Dec 21, 2012
- Location
- Brisbane Qld Australia
Some 20 years ago I made a hydraulic press for a customer incorporating two upright 7" bore shop made rams with around 12" usable stroke.....They are all loose pieces held together by tie rods.....It suffers from becoming air bound under the pistons through time.......Piston sealing is by a single Caterpillar "O" ring ,and there is also a wear strip of brown fibre ,also Caterpillar parts....Can I maybe relieve the O ring groove so the ring will bleed air on the upstroke ,but still seal pressure on the downstroke?.....and save a complete rework of the piston?