Posted by greygoat on October 07, 2008 at 06:28:28 from (75.121.141.212):
In Reply to: loader valve question posted by time2plow on October 07, 2008 at 05:07:14:
Though I am retired as a locomotive machinist/ mechanic, I was an aircraft hydraulic shop foreman, in Army aviation, and moonlighted for many years in a hydraulic shop.In huge earth- movers and excavators, where the control valves cost many thousands of dollars they do rebuild worn out valves, usually by spray welding the spools oversize and precision grinding them to fit. On farm type equipment, most valves, as new, are ground to a close fit and then lapped in, thus a particular spool only fits the bore it was matched to.. on this type of valve a fix consists of putting in a seal kit, or simply replacing o-rings if the valve is leaking externally. Other than that, remachining and sleeving the bore or welding the spool, and machining it is terribly labor intensive,and requires precising equipment far beyond what a home machine shop or small town machinist would have, not even including the heat treating, or surface hardening required. It is just not cost effective. If the actual valve is so sloppy that it"s not working correctly, the only true fix is to replace the valve, if its a block type valve, (2 or 3 spools in 1 casting)or replace sections if it a sectional valve consisting of sections bolted togather. I would be extremely leary of any outfit trying to sell rebuilt or reconditioned valves or valve sections, unless it was a dealer, or through the factory. Slop in the handles could be addressed by using new pins or redrilling the pin holes in the linkage and applying oversize pins, ( or chain links as used in some valves)
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