had a KYB msf- 85p-7 swing motor failure. the grouping pistons failed and seized up the pump. Replaced the bad parts and installed back on machine. Now the pump is very slow left to right or right to left. tends to drift if machine is not level. It will improve with increased rpm but will not go away. The swing brake is also a little slow to engage. if you engage the swing lock button it will engage hard.