usually when you have a bennet that won't retract, either teh line is crimped or the hose nipple is threaded in too far on teh cylinder. Loosen teh fitting on the hose niple for the tab that won't retract, if it comes up, its in the line or the pump, if it doesn't, trun the hose nipple about two turns out and see if it raises. If you install teh hose nipples too far in the bennert cylinders, it will cover the transfer hole to the cylinder, it will let fulid by under high pressure, but it won't let it out
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