Just replaced wheel motor and steering pump on SST 61-25CH SCAG Zero turn mower(estimate 10 years old as bought used 4 years ago). Now pump/ motor is some times slow to respond to steering control and seems to be air bound and/or not getting sufficient fliud flow. Have bled by unscrewing pump release, cycling control forward and backward 10 times,closing pump release and recycling control 10 more times. Any ideas or any other way to bleed the system? Thanks John