Need Help!- 4020 Tool Release Problem

[Applied]

Having a problem with the tool releasing from the spindle on a 4020.
The piston unlocks the tool but I can't pull it out, I have replaced the piston plate & O-ring and all the washers on the draw bar. Thanks for any help

[alex gitzel]

One thing is there may be too many washers if you a coolant thru bottom seal the amount listed on the install sheet does not apply.if you have a locking drawbar(most likely you do) only put in enough washers to get 1 above the top of the pocket NO more,too many washers will not leave enough room for the nessesary trave to get the drawbar down past the floater collet and release the bearings. you may also need to upgrade the drawbar valve the new ones are vlv-0075 (kit with all needed parts) that uses a 3/8 air line that feeds much more volume than the old 1/4 style some times when you replace the washers the old valve has degraded seals and wont make enough force to push the new washers.there are other things but these are the most common.

[DareBee]

If you were doing a long cycle of heavy cutting - the TH will vibrate inside the spindle. This causes fretting, which will stick the TH in nice and tight.
When the machine is cycling the removal sequence hold the TH in 1 hand and hit the side of it with a soft hammer, it will make a nice bang when it pops free.
I find that a good spray of Dry Teflon Lube in the spindle socket really helps.

[denmar]

simple test: Hold downd the in/out botton and with you other touch thand stick a finger in the spindle (not running); fill the bearings if therynot retracted, the floater is moving alone with the draw bar; meaning that the ball bearing holdin the floter in th espindle grrove, are demaged.