I looked in a 450-470 series maintenance manual,& can see that the lever/rocker arm is shaped different, on these Type "AH" pumps & is at a different angle than on a regular Type "AF" pump. Also the knob looking piece on the "AH" is a breather. When they get here I'll check for a difference in the stroke, of this "AH" type, & the regular type "AF". Looks as if it mounts upside down compared to the other.
