Right skid steer not working properly on Raptor SD

Noticed at the end of mowing season last year that the right skid steer was being sluggish. (We've done all the upkeep on a regular basis since we bought it). Went to use it again this season and the right side works when it wants to (very unsafe I know, especially when I'm mowing on a hill). We did notice a puddle of grease underneath the right side, so my husband filled the pump back up. Any suggestions on what may be causing it?
 
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