Posted by Owen Aaland on May 11, 2014 at 00:25:13 from (216.47.33.5):
In Reply to: 1086 T/A posted by Russell Moore on May 10, 2014 at 13:49:30:
Another problem with running with a weak pump is that the MCV pump also furnishes lube for the differential and range transmission. On an 86 series tractor the MCV pump is rated at 12 GPM at rated engine speed. The priority valve sends five gallons to the steering which is also used for the TA, brakes, clutch assist, seat, brake lube, and finally TA lube. The remaining flow is sent to the oil cooler and then back to lube the things in the rear frame.
When ever you loose enough flow that the steering and controls are affected all the oil is going through the priority valve orifice and there is no flow to lube the parts in the rear frame.
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