Not exactly "things done at work" but, posting it here anyhow.
I'm not really a mechanic, but, I've got a little mechanical knowledge. We have a Grove TMS760E. 2001 Model. Nice unit. Couple of years ago, we kept having electrically problems when rotating the upper. At some locations, it would run fine, other locations it would go nuts. We found the electrical swivel snd pulled the can off the top. Full of water. Dried it out, cleaned all the contacts, and it run right again...for a few days when the same symptons occured again. Again, remove the can, and same moisture problems. Thing is, it hadn't rained. So, after checking and watchng closer, we found out the water swivel was seping and blowing steam into the electrical swivel. To remove the water swivel, everything has to be removed..the hydraulic swivel, the electrical swivel, and the water swivel. We didn't have time to get into that, so, we disconnected the hoses, bypassing the water swivel. Just didn't have any heat in the upper. Since I don't run it much...who cares? Right? LOL
Well, a few weeks ago, the hydraulic swivel starts puking oil. At first just a drip, then kept getting worse. So, we decided to break it all dwn to fix it. The Grove manual says to raise the boom to an elevation you can get into the unit, and strap some 4x4's onto the ram, in case the check valves don't hold. (A man has to get up between the boom and cylinder.) I understand the check valves are SUPPOSED to hold it, but...No way would I allow my men to get themselves in that position. We do a lot of structural steel but couldn't find the right size beams to prop the boom up. So, I ordered two W8 x 35# beams and made a cradle on the end to support the pin where the cylinder attaches to the boom. The beams had to be like 19' long. Slide the beams under the pins and welded them to the deck. Maybe overkill, but, It just feels and looks safer than two 12' 4'x4's.
Anyhow, got evrything tore apart. The water swivel was wore out. Grove has changed the design, so we just ordered a new one...$400 or so I think. I had NO idea how a hydraulic swivel would work, but, I do now. Wow, what a design. There's some smart people around. The guts looks similar to a piston with rings. Instead of the piston working like in an engine, it simply rotates. (cont)