Looking at a l4150 with a BF900 loader. Everything works fine but the loader speed is slow (at 1500 rpm it takes 7 to 8 seconds from ground to full ht.). Plenty of fluid, 3 pt down and joy stick throw is fine.There is also no diverter valve and it has plenty of power. Lift and curl are both effected. Is this normal? If not, any suggestions?