I put a thumb on my 315L excavator used suregrip controls i had the extra bank on the machine it works fine but when it sits for a little while and i go to use the thumb when i go to pull it up it drops a bit first then goes up not sure if my lines are hooked up right on the pilot valve
The cylinder could be the problem
was wondering when you installed the thumb did you have to get new pins? or can you use oem
If you leave the thumb up, it's not uncommon for them to drift, they'll creat a vacuum on the back side of the piston, suck air around the rod seals and then when you try to raise it back up the spool shifts and opens the piston side to tank, the weight causes it to fall until the air compresses enough to lift the thumb.
Usually if it's a new thumb it comes with 3 pins. The main pin that goes through the end of the stick (as it now needs to be longer) and the 2 thumb cylinder pins. If it's used all bets are off and you need to see what the seller is including
i thought so was just making sure any ideas where I can get a set of oem pins i just tore my thumb off to get ready to adapt to a mb90 crusher on my ex200lc3 thanks for such a quick responce
I bought a bunch of pins from Axis Parts this spring for my 210. Should be same pins for you. 80mm diameter, 510 mm long. I have a pin grabber so the quality was really a non-issue. Paid $160 each delivered to my front door.