Dads got a 1990 Zetor 7245 on a loader. It gets used every day of the year to feed the cows. But unlike his other Zetors (5711 and 5945) it need the lift pump priming to start. The other 2 you just press the cold start (and his other past Zetors (6711, 3511). If he doesn't it takes alot of winding for it to fire, where the others go straight away. is this normal or do we have a problem. I'm thinking injectors.