Great job so far...nice to see it pushing some dirt!!!
I agree with Lil Giants comment on using a plastic slider idea to ride on the track chain... I used it on my dozer and so far it works great !!
( If you are interested watch the build vid I posted on the tube...may help give you some ideas...
http://www.youtube.com/watch?v=AV596tHo0_o )
Keep up the good work!! Like how the hydaulics work!!