H3222K Hydro Motor

In search of a hydraulic motor to replace one on my Ferris H3222k 3-Wheel Mower. Bearing failure on previous motor ruined seal resulting in a large puddle of oil under left wheel seeping from the output shaft. Rebuilt the motor but seems to be slow in reverse with less power than before. Hoping to find a used motor from a salvaged unit or any suggestions. Thanks. Model number of motor I have on the mower is: White Hydraulics HB1424517GK.

After properly purging the air from the system the unit seems to be fine at this time. In this case it did take some time to get the air out of the system. Hopefully my search is over for now.

During conversations in regard to the rebuilding of the hydro motor on my H3222K, I was asked the serial number of the mower. On that tag below the console was a somewhat hand etched serial number 555. When looking up parts for this unit the serial numbers start at 855. Can anyone tell me what I really have?