If there are no vacuum leaks in the lines and the lines aren"t stopped up then the seals in the actuators have to be the problem. I"d just about bet that your milk pump is either pulling more inches of vacuum than your getting on the cars system or it"s pulling at least as good of a vacuum but can sustain the pull enough to overcome any seal leakage. In other words it"s pulling the same inches of vacuum but at a greater volume so it can sustain that amount of vacuum constantly instead of the vacuum dropping off due to leakages. Try putting a valve in the line to the actuator, put the vacuum to it, and then shut the valve. If there is no leakage across the seals the actuator should hold it"s place because of the valve, if it moves then it"s not holding the vacuum because the seals are bad. Good luck.
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Today's Featured Article - Women and Tractors - More Views From the Farmer's Wife - by Teri Burkholder. The top ten reasons why the judges wouldn't let you participate in the stock antique tractor pull: Hey, this is stock! It came with that V8 in it! That "R" on my tires stands for "really old" not radial! Blue gas? We thought it was a pretty color! What wire hooked to my throttle?
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