Dozer !
I will be pushing and moving dirt for a motocross track in rock and clay.
Thanks.
HI!
I would search for a D6C size dozer!
14-18 tons machine with 6 way blade and 5-7 tooth ripper/scarifier.
I have a lot of experience of motocross track maintanance, both on hardpack and really soft sand tracks. I as former pro rider i have also been keeping the track in good shape over 10 years
rofessor
The second option would be a trackloader with 1/4 bucket and ripper, 10-15 tons machine (cat 955, 951). single grouser or dubble grouser would be the pads to prefear.
make shure the machine you buy have powershift tranny!!! and it on the track its better with accelerator pedal instead of deaccelerator pedal, but its easy to change, and doesnt matter so much when you get used.
I have tried almost everything on the track, ag. tractors, excavators 1-30 tons, wheel loaders and back hoes.
the problem with agricultural tractors, even if if they are BIG 4wd's is that they don't cut the top's of the braking and aceleration bump's. They just push the soft material betveen the bump's and then it goes in bad shape really fast again. I have used a 5,5 tons, 6000series Deere with loader and blade in the rear.
also preparing jumps is a lot harder with ag tractors and wheel loaders, with a dozer you can make really good jumps when you get used to the blade! The wheels are so sensitive for small bumps, they don't float on the ground like tracks do.
also an big excavator is quite good to prepare the track with, but it's slow and expensive compared to the dozer. with the dozer you can use a blade up to 4 meters wide, then again the excavator can hardly carry a bucket wider than 2 meters... with the dozer you can make one long straight in one push, with the excavator you have to move the machine all the time.
The first dozer i had on the track weighted only 7,5 tons, and it was all to light to use in hardpack. when i bought the D6C things started to happen! the fuel economy was a lot better and i could prepare the track a lot faster (2-3 times).
I use the trackloader and excavator mostly when i need to do some bigger changes, it's quite rare othervise that you need to carry dirt.
to prepare the stadium whoops i use a smaller excavator 1,5-5 tons, with a wide tilt bucket.
Have fun!