... the following publications: AR 31 0-2 5, AR 31 0-5 0, FM 1-5 00, FM 1-5 09, TM 1-1 50 0-2 0 4-2 3 Series, TM 5 5-1 510-Series (Fixed Wing Maintenance Manuals), TM 5 5-1 520-Series (Rotary wing Maintenance Manuals) ... turns, not the cam. The stationary-cam pump is not used on the Army's OV-1, AH-1G, and UH-1C. 10 AL0926 VARIABLE-DELIVERY PISTON PUMPS A variable-delivery piston pump automatically ... two tubes. Because the smaller piston has a .5-square-inch (sq in) exposed surface and the floating piston has a 30-sq-in exposed surface, the 3,000-psi pressure acting upon the smaller forward...