Ok got the hydraulic slew/swing motor out look at what I found
View attachment 132068
thanks for your help guys
Ha ha, welcome to the club Chass.
I've got the same machine and I've actually just been to the gear makers today to drop of my slew motor pinion so they can make me a new one. I'm also going to change out the ring gear (BIG job), and do the swivel seals while it's out.
I did this repair 7 years ago. Changed out the slew ring and the slew motor. Now my pinion is exactly the same as yours, not a bad run. There's no underlying problem, it's just worn out.
You'll probably find the ring gear is not in the best of health either. Clean it all out and rotate the top of the machine through its full circle so you can check every single tooth (110 of them). Particularly check the ones where you operate most of the time. In my case that's facing in the direction of the blade with the boom slightly offset to the right for easy viewing of the digging.
It's a crap job changing out the ring gear. Took off the canopy, boom/stick, counterweight. Then somehow I managed to drag the carcass into the workshop and get it raised up on 200mm square steel tube. Disconnected the impossible to get to hoses on the swivel, etc, then used an engine crane to lift the top of the excavator off the undercarriage. Damn it sounds so simple when I write it, but believe me it was a pig of a job, these small machines are so frustrating to work on. Hopefully you don't have hands like cows udders or the job will send you insane.
If you've got some heavier lifting gear and plenty room, you shouldn't have to remove the boom/stick and counterweight. I only did that because the engine crane is all I had, plus I didn't have room in my shed.
I'm still coming to terms with the fact I'm about to do this all over again.
Good luck with it all.
Keith.
While I'm here, does anyone know any part suppliers that might carry spare output shafts for these slew motors. Cat only sell the complete motor. Can't find any here in Australia at present. I often find parts easier to source in the U.S. and they're often cheaper even after I get them flown over.