The 9 gpm (at rated engine speed) MCV pump flow goes first to a priority flow valve with a 3 gpm orifice. The 3 gpm flow that passes through the orifice goes to the steering. The rest of the flow goes to the oil cooler in front of the radiator and then back to the MCV where it is sent to the rear frame to lube the reverse idler shaft assembly and then on to lube the ring and pinion gear and the range transmission main shaft.
The 3 gpm flow that goes to the steering returns to the MCV where the pressure regulator valve maintains the pressure at about 240 - 270 psi for the brakes and TA. If the steering is put on high pressure from load there is a steering relief valve that limits the pressure to 1600 - 2100 psi depending upon the tractor model. Oil that bypasses the relief valve is ported to the steering return flow in the MCV.
Once the oil passes the pressure regulator valve on a 706 or 806 1gpm flows to the brakes through an orifice in the brake control valve (open center) inlet fitting leaving 2 gpm for TA control. On tractors newer than the 706 and 806 the brake control valve is a closed center valve so there is 3 gpm flow available to the TA except when the brakes are being applied. The oil flow remains after leakage from the brakes and TA goes to lube the TA where it is limited to about 18 - 20 psi.
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Today's Featured Article - Women and Tractors - Tractor Engine Repair - by Teri Burkholder. One of the great things about working on a tractor engine with your other half is that you know what he is thinking of at all times and can anticipate his every move and his next thought of what he will do. With Ben, anyway, I can tell! He'll be busy working and I’m handing him tools and he says, "give me that..." and I’ve already got it in his hand or "hand me that....."and I’ve got the portable light right where he needed it placed to see. "Run in the house and get me a...."as I open th
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