blade controls

lp14255 · Post by **lp14255** » Mon Apr 15, 2013 8:59 am

on my 350 i have the 6 way blade and have replaced the o-rings for the spools 3 times already and the same one keeps leaking. if im thinking right as the valve control is bolted in place its the one on the bottom next to the pressure valve .

CatD8RII · Post by **CatD8RII** » Mon Apr 15, 2013 4:28 pm

What is the condition of your valve spool? If the spool itself is damaged it will cut the o-ring when it slides past it. I 'm pretty sure the valve you're referring to is the lift spool, easy enough to confirm by seeing what function on the handle moves the leaky spool

lp14255 · Post by **lp14255** » Tue Apr 16, 2013 6:38 am

The spool and vavle body are in good shape.

KenP · Post by **KenP** » Tue Apr 16, 2013 12:32 pm

deleted

Post by **Lavoy** » Tue Apr 16, 2013 1:54 pm

My guess would be the bore is worn out. Deere used to make oversize spools for the two cylinders in about .003 over, so it does not take very much wear for things to not work.
Lavoy

CatD8RII · Post by **CatD8RII** » Tue Apr 16, 2013 4:00 pm

I agree with with Ken and Lavoy.

Many hydraulic repair shops can still repair worn out bores /spools. I just had the control valve on my 350C dozer repaired by the local Cat dealer. I'm not 100% sure on the procedure, but i know they re-chrome the spool itself, and then hone out the valve body to match the new diameter. Was much much cheaper than trying to buy a new control valve.

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