Doesn't sound like a shuttle valve problem to me. If it is already moving forward the shuttle valve has moved to it's proper position. I would suspect the problem may be the SR lever is not moving the control valve fully due to wear on quadrant or lever. It needs to pull control valve spool out enough to allow capsules in control valve to ride down the hump and fully seat the balls. I would just try forcing the SR lever fully to the side when advancing it and see if you skip past the problem area. If so, then you need to do an adjustment on valve linkage or repair worn areas.
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Today's Featured Article - Tractor Profile: Case VA Series - by Staff. V, VC, VI and VO). Althouh the Case VA looked much like the V, it shared no major components with its predecessor. Except for military units, the production of the Case VA was interrupted in July of 1942 due to World War II. It resumed again in 1944 and continued until 1953. It started up briefly later on in 1953 and continued on a very limited basis until 1956. The VA Series included the following models: VA: Fixed front wheel tread VAC:
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