Posted by Owen Aaland on June 27, 2010 at 21:16:59 from (65.165.246.5):
In Reply to: 1586 steering pump posted by Crazy Red Power in SE-WI on June 27, 2010 at 17:17:30:
LBSMJS said: (quoted from post at 21:10:29 06/27/10) It sounds like the pump.After replacing it you,should consider the kit that gits rid of the supercharge line from the aux. valves.When this valve gets bad it can let the MCV pump suck air and take out your new pump.It will be like the 66 series low pressure system then,but the extra flow from your brake lube will be used for more lube in the TA & trans systems.
The supercharge line has nothing to do with brake lube or the amount of oil going through the MCV pump. It should have oil flow in it only when neither the hitch nor any aux valves are being used. When ever there is demand for oil from the rear pump the return flow is dumped to reservoir and not to the supercharge line. The reason for it being there is so that you do not have to draw 29 GPM of cold hydraulic oil through the filter. It was bad enough with the older tractors using 21 GPM. A better solution may be the kit to run two hydraulic filters.
The operation oil for the steering, brakes, TA, seat, and diff lock are all controlled by the size of orifice in the MCV assembly. 06 through 66 series use a three GPM orifice, 86 and newer use a five GPM orifice. The extra oil in the 86 series is used to send one GPM to each brake for lube. The TA, brakes, seat, and diff lock are all closed center valves and only use oil when actuated. Three GPM minus leakage losses are available to lube the TA. Any oil in the TA lube circuit that is at pressures above about 18 PSI get dumped back to the reservoir.
The 86 series tractors use a 12 GPM pump on the MCV. Any oil flow above the 5 GPM that goes for controls is routed to the front oil cooler and then back to lube the differential and range transmission upper shaft. The 5 GPM is priority flow so when the pump gets weak and the flow drops off less oil goes to the rear frame. When it gets to the point where you notice a loss of braking or the TA lube light comes on you have NO lube going to the differential. That is why it is important not to continue to use a tractor with a worn out MCV pump.
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