Re: Trim issues
Almost exactly as pnwboat has pictured. The only difference is that your check valves unscrew with an allen wrench and his are held in with a retaining clip. Yours are slightly larger to accomodate the allen key. Do not take apart gear plate. It will be difficult to get pressure setting correct and tested if you do. So just leave it alone - exactly as pnwboat has pictured.
the outer black orings are standard Buna material in sizes 011, 012, and 015. If your hydraulics shop has them in stock, ask for the two 015 orings in hardness 90. This is also a primary failure point of the chinese valve body. They substituted a metric size oring and used a larger seal made of softer material. About 1/3 of the chinese VB will drip from this seal even though they are brand new. Replace with a BN90 oring of correct size to fix the chinese drip problem.
The inner, red in picture, oring is the one that causes bleed down. It can be found in a Briggs & Stratton carberator rebuild kit. Gently clean the poppet with small wire brush. Wash other parts in acetone or lacq. thinner to remove oil film. apply very small drop of locktite around the steel seat (cap). after assembly let dry with cap facing down so that gravity will draw locktite residue away from spring. Do not hone center fluid channel. flush with mineral spirits or blow clean with air. apply thin film of oil to all parts prior to assembly. Engine assembly oil works well. The orings on check valves need to be lubricated so that they do not catch and tear.
