The pre charge is set to about 5psi and is designed to lower the tool release piston onto the drawbar gently prior to the main tool release solenoid activating. If the precharge is not working you will hear more of a pop prior to the tool being released. If it is stuck on you will see symptoms as described prior.
The silver T manifold acts as a check valve when the main solenoid is engaged to prevent air flow back to the pre charge solenoid.
Water and/or oil contamination in the air line is the biggest cause for the solenoid to become sticky and not work properly. I have tried on several occasions to clean the soleoid with mixed success but that could just be me.
Also, if the exhaust port is appears to be blocked by sludge/dirt, try cleaning it as that will have an effect on performance as well.
On a different note; if you are experiencing a weak tool release, check the o-rings for the tool release piston assembly. The shaft that runs down the center has 3 o-rings that will develop a flat spots. Snap ring pliers and an extra hand to compress the spring is all you will need.
Good luck all.  |