I just bought my first splitter about 2 weeks ago, a Huskee 22 ton. Other than the obvious maintenance to the motor like oil changes, do I need to do anything on a regular basis to the hydraulic system? The book really doesn't give any info other oil changes for the motor. I notice it has a filter for the hydraulic fluid. Do I need to change this periodically? Will hydraulic fluid need to be added from time to time? Or do you need to completely change the hydraulic fluid on a regular basis? Any other maintenance needed? Thanks!