Near Intersection of I-35 & I-90 Southern Mn. | I agree with the reply above. If the Servo is "stuck" this would explain the problem in automatic and also why you are not able to reduce the flow (and have to drive fast) even in manual.
The early MT servos were rather crude. They did not have limit switches such as a Raven has. They just had a physical mechanical stop to limit the Servo from going round and round. The Servo can be tested but should only be tested with a 9 V battery as straight 12V can damage them. Possibly newer MT servos are more sophisticated.
The idea of listening for action within the Servo (with the engine off etc.) would be fairly easy to do. You may need a helper if your hearing is poor like mine.
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