Some new information... according to QA Tech, screwing in the cap until it bottomed out did not stop the leak, but seemed to lessen the severity. During normal assembly, we bottom the cap out and thread it back up to 170deg for port alignment. That's a total of ~1/32 worst case backed off, which...
hydtools, The diameter to the left is 3.878+.002/-.000. Gland diameter should be 4.215+.004/-.000 rather than 4.097. My mistake on the quick sketch-up; Apologies on that one.
I'm in the process of checking with manufacturing in our plant on the tooling issue. It's a very good possibility that...
Correction for the drawing above: The 4.215 dim is for the gland diameter. That dimension should actually read 3.878 +.002/-.000. Apologies for the confusion.
hydtools, I'll check on that process/inspection and get back, although we're calling out a 32 rms finish on that surface.
Temperature and compatibility isn't an issue... it's a simple industrial application at room-temp with BUNA-N seals, which have excellent compatability with hydraulic fluid...
I'm trying to determine what is wrong with a double-acting hydraulic cylinder with an external cap (static female radial gland). We're getting occasional leakage through the threads without visible damage to the o-ring. We're using an #344 Parker o-ring with a single backup and all dimensions...
