Mine is usually set at around 45psi for AD3 rivets and around 85 to 87psi for AD4 rivets. I haven't noticed any bubbling like that on mine before.
Don't forget to oil it regularly. My setup is similar to yours except I have a quick disconnect right after the filter. I usually put 5 or 6 drops right in there before I use it.
Thx for the feedback - do you mean oil it like you would oil a drill? I bled it carefully, albeit managed to make a mess despite my best efforts.
Looking thru the instructions again to see if i missed something?
6.0 Maintenance
The NUMATX NXC-3 c-squeezer has been manufactured to give maximum service with minimum care. In order that this may be accomplished, the following recommendations should be followed.
6.1 The squeezer system should be full of oil and properly bled per Section 7.
6.2 Use only Dexron III or compatible fluid. See Dexron III safety Data below.
6.3 Keep the unit clean and free of excessive moisture, to minimize wear on moving parts.
6.4 It is recommended to use dry filtered air as a pressure source to the intensifier, which
will extend the seal life of the intensifier piston.
6.5 The system should be routinely inspected for oil leaks. Check the bleed fittings of the
intensifier and c-squeezer to ensure they are tight. DO NOT OVERTIGHTEN.
6.6 The bleed plug in the c-squeezer may be removed to examine the fluid level.
6.7 Avoid dropping any portion of the unit, as this may cause damage to close tolerance
parts.
6.8 Section 9 shows an exploded parts list for the C-Squeezer unit.