Hydraulic pump replacement on a poclain CK81

Help wanted. we have taken the linde pump off the CK81 and replaced it with one from a 688, whilst most of the plumbing is fairly obvious the 688 pump seems to have 3 low pressure inputs one being on the lower part of the bell housing. I have the manuals for both machines but they omit the pipes to the lower bell housing. phots of the 688 pump in place might be handy

Hydraulic pump replacement on a poclain CK81