Iwata

[Protek]

I have an older LPH400 that recently started pushing air into the paint cup. I also just purchased a (brand new) LPH 400 and it is doing the same thing. What could be causing it?

 

[Dave C 5]

Your nozzle is not tight enough ? That’s what mine does when it’s loose

 

[MJM]

Interesting topic..........how does one know they are pushing air into the paint cup?

 

[Dave C 5]

I can hear mine bubbling

 

[Klleetrucking]

..how does one know they are pushing air into the paint cup?

I found this out when I adapted a DeKups to a HF gun.
It was pressurizing the bladder/cup! With thinner in the cup and the trigger pulled in the air only position a stream of bubbles entered.
Per sprint_9's advice I tightened the nozzle to gorilla torque and the bubbles quit.

Granted, this was a pos HF gun so take it fwiw.

 

[MJM]

Thanks fellas, putting that one in my memory bank.