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Farm Machinery
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JD 2850 Loss of Hydraulics
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<blockquote data-quote="Tractortech" data-source="post: 6955883" data-attributes="member: 13204"><p>Your 2850 will have double acting closed centre spools. No need to rob them off the 1140.. I thought I saw a filter bowl on the well know auction site. However, I can't find it now..</p><p>As for the motor.. Some motors don't like back pressure and blow the shaft seal out.</p><p>You are indeed correct that the return oil from the spools should pass through the spin on filter and back to the lube circuit which supplies the front pump. Unfortunately, many such tractors had the ball, spring and valve seat removed from the spool base. A single acting ram struggled to overcome the back pressure of 155 psi. Little tipping trailers and post drivers had problems.</p><p>So, if it's in place and your motor is OK with back presure. Return into the SCV Coupler. That way, the pump drives the motor, returning oil goes directly back to the hydraulic pump.. Back to the filter bowl has the same effect..</p></blockquote><p></p>
[QUOTE="Tractortech, post: 6955883, member: 13204"] Your 2850 will have double acting closed centre spools. No need to rob them off the 1140.. I thought I saw a filter bowl on the well know auction site. However, I can't find it now.. As for the motor.. Some motors don't like back pressure and blow the shaft seal out. You are indeed correct that the return oil from the spools should pass through the spin on filter and back to the lube circuit which supplies the front pump. Unfortunately, many such tractors had the ball, spring and valve seat removed from the spool base. A single acting ram struggled to overcome the back pressure of 155 psi. Little tipping trailers and post drivers had problems. So, if it's in place and your motor is OK with back presure. Return into the SCV Coupler. That way, the pump drives the motor, returning oil goes directly back to the hydraulic pump.. Back to the filter bowl has the same effect.. [/QUOTE]
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JD 2850 Loss of Hydraulics
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