Howdy folks, I bought a somewhat shabby little PC40-3 a few weeks ago. I was told that one track occasionally locked when going forward but was fine running backwards. Got it home and after checking all fluids and giving it a good grease took it up an old overgrown farm track, clearing the overgrowth and squaring up the eroded track shape. The tracks worked fine until I turned the undercarriage 180 so I could use the blade without shoving a dirt pile into scrub I hadn't cleared yet - that was when the left track started locking up. I checked externals and found the front idler bearing has a lot of play but all the rollers seem fine and I can't see anything catching. Decided to change the final drive gearbox oil (Hy-Dash) and found fine metallic particles and flakes suspended in it. Flushed some new oil through the box then filled it fresh and tried it again - no improvement, in fact it continued to get rapidly worse. I tried to get back to level ground to take a look but it locked and refused to move with direction reversal as before. Lifted the track off the ground but the sprocket isn't even trying to move the chain. When looking for movement I noticed a grouser shake off dirt and heard a faint grating noise that sounded a little like a valve squealing but I fear is a spinning sun gear. Looks like I'll be fixing it right where it is. I have been told the gearbox cover can be levered off. I took an oil bung out and found a bolt that fitted then used a crowbar under the bolt head to lever the cover off but it feels solid and I don't want to break anything. I could drill through the bolt and braze a tyre valve to it then use a hand pump to pressurise the gearbox - can someone tell me if the cover has any retainer, I can't see one. Any advice on how to proceed would be greatly appreciated.
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