This is a new Sauer-Danfoss (formerly Sundstrand) hydraulic pump used on Bobcat 853,863,and 873 skidsteer loaders.It replaces the obsolete Bobcat part number 6665551 and the earlier part numbers 6657327 and 6658124. Just because you have an 853,863 or 873 does not quarantee this pump to fit.Please check your serial number or pump number. It was originally used on all the following Bobcat machines
853 All serial numbers
863 serial numbers up to **** 24999
873 up to serial number 5141 14999
873 up to serial number 5142 12999. This pump has a 3/4 inch 11 spline shaft and the O-ring Boss ports.Bobcat sells only the updated pump number 6673916 with the 4 bolt flange pressure outlet.If your pump has a 4 bolt pressure outlet fitting,do not order this pump. If you can find numbers on your pump tag ending in 34022 or 29155,then this is the right pump for you. | 
