School me on hydraulic components

[JDH429]

Excuse my ignorance... I have read some of your posts on the 4200 and thought maybe there have been some updates or improvements noted since they first came out...Maybe the poor quality has pementatly stained its reputation...youd think whoever was trying to sell it would be promoting and or getting involved with the community to fix that...
Anyway thank you for the radio suggestion. Im a fan of the Spektrum radios and have a few but nothing as sophisticated as the sytems your using. This will all be a big learning process.
One more question is about the Slew Gear Ring? Is this usually a custom built part? Ive seen the servo operated gear box and actually hav the same one that CDM used here on his build

http://i.imgur.com/HsOukKr.jpg

But the contact ring for the track motor is what im wondering about...or is there a kit that some one sells already? Id like the swing to be somewhat quiet and powerful to be able to shove material across the ground on the swing without an issue. Get back to me when you have time. Gonna email http://www.der-getriebedoktor.de/sho...l.php?kid=3100 shortly.
thanks again