630 interlock valves

Klyde

Member
Location
Upstate NY
Slow hydraulics on the 630 have bothered me for 20 plus years, now it has gotten to the point that I just use the EH. (that works fine) Got another set of hydraulic off a parts tractor and was going through it. (going to change the whole thing) Pump on parts tractor about shot, guess they NEVER changed the filter! So I got to looking the rest of it over. Pulled the interlocks off and tore them apart. Could not believe the clearance between the spool and the bore. Went to my tractor and found the same thing. SO now I know why the hydraulics are slow. Wonder how much clearance there supposed to have?? Anybody know??
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A spool in a valve generally is a honed fit. A new one on a test stand should not leak on it's function test without the quad rings. The quad rings just help keep dirt out. What is the fit on the spools you have?
 

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