I'm putting a number of P2K HO locomotives through the shops, overhauling them and fitting them with sound. On the Athearn type trucks it has been a relatively easy process to remove the side frames and pry the bottom cover off, releasing the wheelsets for replacement. Yes, I have been surprised at how many are cracked. Now I am on to the SD7s and SD9s with apparently a Kato style truck. Even if the gears aren't split, I would still like to inspect them, clean and lubricate them before going to the trouble of installing the decoder, LEDs and speaker. How does one get these trucks apart. I've removed the truck from the loco frame (easy). I've removed one side frame (don't know how I did it, can't repeat the process on the other side) and have had no luck in exposing the gears. The lower portion is a single piece that seems to lock into the upper part with four tabs but I have been unable to release the tabs. The upper part is actually two parts split vertically. Anyone successfully dismantled these trucks? CNWoz, Australia