Posted by Owen Aaland on September 24, 2010 at 15:54:33 from (207.13.114.193):
In Reply to: 706G dump valve adj. posted by Janicholson on September 23, 2010 at 10:11:26:
Quoting Removed, click Modern View to see
You have the classic problems caused by loss of flow/pressure from the MCV pump.
Unless the tractor stops completely and not just act like a slipping clutch, the problem you are having is not caused by the TA. Not having the problem when the TA is in the low side will confirm this. If that is the case a new TA will act the same.
When the pump gets weak it can no longer provide enough flow at higher steering pressures to maintain 3 GPM to the control circuit for brakes and TA. When the flow drops enough so that the pressure cannot be maintained in the direct drive clutch of the TA, the clutch will slip and the TA will pull on the low side clutch. This is the loss of speed that you are noticing.
Continuing to use the tractor will cause excessive wear in the direct drive clutch pack while it is slipping. More critical is something that you do not notice. Whenever the MCV pump cannot provide flow in excess of 3GPM there is no oil flow through the oil cooler. The oil returning from the oil cooler is used to lubricate the range transmission,bull pinion bearings, and the ring gear and pinion.
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