Anyone done this job? I ordered a new charge pump cover (my left side is leaky); will I lose most of the oil in the transaxle when I remove the old cover? And should I have ordered a new o-ring? Also, the new one that arrived (Hydro Gear part# 53738) does NOT look like the one shown in the HG service manual. I got the part number on the phone w/ HG, supplying my transaxle full ID number. Did anyone else encounter this? Thanks in advance.