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I worked this problem several years later than '92. Your "double o-ring" sounds like what the o-ring suppliers called the "quad-ring". The cross section looks like a 4 leaf clover. If nothing else that should help prevent the piston from tipping in the bore and getting wedged. I recommended...

Cat p/n 3P-1155 one of the o-rings for the rebuild? That was the one on the floating piston when I was working the problem. The 3p-1155 o-ring is a 75 durometer fluoroelastomer. Do not recall the dash size. Fluoroelastomers (Viton) are great for use with all petroleum based fluids and high temp...

I never could blame the problem on the o-rings. Suspected it was the floating pistons or the bores they rode in. If these can be field rebuilt that tells me all the parts swapping and hand fitting at the CAT transmission factory sorted out pistons and other components which function as...

The transmission itself may be a fine piece of equipment but the pneumatic controller is a basket case. I was an engineer at Caterpillar Inc. I was responsible for a bunch of rubber parts including o-rings. The transmission factory asked me for help on this controller. It had a lot of...