The breathe tube off the hydro tank leaks like a sieve if your operating at a decent side angle or roll the sucker. I replaced the tubing with a pressure relief valve such as found on the 4200XL. You'll have to grind the tank cover a bit. Fill tube is on left and overfill is on right looking from back of dozer. Also if your planning on running lights this would be a good time to run the rear lights.
