It takes a lot of power (stress) to turn a 80 psi pump. Maybe the gear isn't up to the task. Hook up a drill to the pump, spin it and you will see how much power it takes.
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1968 Firebird 400 RAII M21, 3.31 12 bolt, Mayfair Maize.
1977 Trans Am W72 400, TH350, 3.23 T Top
Everyone you will ever meet knows something you don't.
Bill Nye.
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