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Message: <blockquote data-quote="mike_belben" data-source="post: 102319" data-attributes="member: 14096"><p>Raise cab. Find main valve block and remove the relief, its on the top front where the control rods attach to spool stubs on a 743. Like 27mm socket i think? Remove it, watch for an o ring to be left inside the cavity. Clamp valve in vice, unscrew the cap, pull out spring and shims and pintle. Inspect seat, clean up with sandpaper, lapping compound.. Ive even fixed them with a hand file in a pinch. Reinstall and try again. Shim if still too low. If it dont respond, pull charge pump and recondition the guts.</p></blockquote><p></p>