Posted by Chris Case [107.194.22.27] on Friday, May 15, 2015 at 13:49:46 :
In Reply to: This might work posted by Bruce in BC [24.207.105.85] on Friday, May 15, 2015 at 09:49:07 :
The seals are not in the high pressure area of 1200 psi. They are in the return area, so you might try blowing the air in through the return line fitting. But I don't know which seal will blow out first, input shaft or sector shaft.
But I wonder if there is a problem with return lines, letting pressure build inside the box?
Or if the Hydroboost lines are routed correctly? Is that the problem with tee-ing in the return line rather than a separate fitting on the pump reservoir?
Now the way the system works is that the fluid is constantly flowing from the pump and back via an open return valve in the box. When power is needed, that valve gets closed, and high pressure is routed to one end or the other of the piston/rack gear. Then the idle end of the piston pushes unused fluid out the return.
The piston has rings on both ends, and if they are good then there should be no real pressure on the sector shaft area, only form the back pressure of the return system. I think if that seal is really puking, that bodes ill for the internal rings. Said O-rings are cool blue teflon, with a rubber ring underneath to keep pressure on the teflon.
They are rebuild-able without any special tools if a guy can keep real good track of a couple dozen 3/8" steel balls. And the "bird cage valve" parts. I think John Moses Browning designed that box as well as the 1911 Colt. Genius.
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