Several STATIM cycle faults can result from a solenoid exhaust valve that is stuck open or closed, so annual maintenance is key.
There are two simple methods for removing the plunger tube without the special solenoid plunger wrench if you do not have one.
First very easy method:
You can use two nuts 🔩 tightened on the plunger, and then loosen the plunger with a wrench on the bottom nut. The top nut works to keep the bottom nut in place as a jam nut.
Remove the nut then the yoke and coil from the solenoid plunger valve.
Then screw on two nuts on the plunger tube. (should be 11/16 OD – 3/8 ID at 2/64 thread)
Tighten the top nut, then loosen the plunger tube with the wrench on the bottom nut turning the opposite direction.
Alternatively, you can use two wrenches:
Tightening the top nut until with one wrench until you can loosen the plunger by turning the yoke of the valve the opposite direction.
See my below video for how to open the plunger tube in under 30 seconds for STATIM solenoid exhaust valve maintenance.