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John Deere 3350A front loader hydraulics problem
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<blockquote data-quote="Tractortech" data-source="post: 8154622" data-attributes="member: 13204"><p>Well, here's the dilemma...</p><p>Retuning all the oil through the spin on filter may cause it to burst, that's why the bypass valve is in the SCV base. However, in reality the bypass valve arrangement could cause a restriction, which used to prevent tipping trailers coming back down in a timely manner, so we used to remove the ball and spring which allowed the oil to return to the rockshaft housing.</p><p>The 40 series tractor which is basically the same tractor used to return all the oil to the rockshaft housing as they never had the spin on return oil filter. </p><p>When a loader was fitted to either a 40 or 50 series tractor, the loader used to return into the filter bowl. That's the one bolted vertically under the transmission case with a ½" UNC bolt, (a ¾" AF spanner fits) unfortunately, your filter bowl has no return port so you'd need to change it..</p><p>Oil returning to either the spin on filter or the actual filter bowl has to overcome the 10.5 bar low pressure Oil which supplies the main hydraulic pump.</p><p>The main hydraulic pump is 'closed centre' not CCLS or PFC type so has no sensing line. I hope the valve you have is correct. An 'open centre' valve won't work either..</p><p>I hope you can understand all this ok. I know no Croatian, but your English looks good..</p></blockquote><p></p>
[QUOTE="Tractortech, post: 8154622, member: 13204"] Well, here's the dilemma... Retuning all the oil through the spin on filter may cause it to burst, that's why the bypass valve is in the SCV base. However, in reality the bypass valve arrangement could cause a restriction, which used to prevent tipping trailers coming back down in a timely manner, so we used to remove the ball and spring which allowed the oil to return to the rockshaft housing. The 40 series tractor which is basically the same tractor used to return all the oil to the rockshaft housing as they never had the spin on return oil filter. When a loader was fitted to either a 40 or 50 series tractor, the loader used to return into the filter bowl. That's the one bolted vertically under the transmission case with a ½" UNC bolt, (a ¾" AF spanner fits) unfortunately, your filter bowl has no return port so you'd need to change it.. Oil returning to either the spin on filter or the actual filter bowl has to overcome the 10.5 bar low pressure Oil which supplies the main hydraulic pump. The main hydraulic pump is 'closed centre' not CCLS or PFC type so has no sensing line. I hope the valve you have is correct. An 'open centre' valve won't work either.. I hope you can understand all this ok. I know no Croatian, but your English looks good.. [/QUOTE]
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John Deere 3350A front loader hydraulics problem
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