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 - Search For Spares - by Anthony West (UK). Following on from the aquisition of the old Fordson F, I was very much in need of spares. As a novice though I didn't appreciate the fact that there were so many Fordson tractors made, that all the other makes seem rare by comparison. As far as I was aware a fordson was a fordson and it was only through trial an
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