Smg hydraulic pump motor failure

What is your question?

i have a problem in my hydraulic pump e60 m5 Euro it's engaged on 2nd gear and there is no startup i will change pump motor definitely but i don't know if there is another parts i have to change or not idon't want to spend alot of money i want the best decision and i know the pump is expensive and the worst thing ever. i heard that there's tuned pump and more tough is it real ? I'm from egypt and there's no dealer ship but i can order the failure part need help