Changed a water pump in a fullwood 600 Gallon milk tank. The trick with these is to do the bolts up till they snap, quicker than trying to undo 20yo rusty bolts, needs a 7/16 crowfoot socket and 12" extension bar to get at them and unscrew the pumphead from the motor and take them out seperatly.
Got new pump fitted and running and then the customer said he had'nt wanted it fitted He also insisted on keeping the box the pump came in so no doubt even now he's trying to find out how much it cost so he can moan about my mark up, thats farmers for you

Jon