Vacuflush Help

[denpooch]

Calling all Vacuflush experts!
Today on the last day or our one week cruise the Vacuflush system started making a 'banging' sound when the vacuum pump is working. Way out of the normal flushing sound.
I called Dometic technical support who suggested that it could be a quick fix and they referred me to the local distributor. He suggested that it can be any number of things and referred me to a service guy he uses. I placed a call and don't expect to her back any time soon.
There is no leaking. The unit creates a vacuum. However, the banging is not a good thing.
The distributor told me that I should not run the flush in the current state.
All thought and suggestions are welcomed.

[KyleR]

Maybe the motor came loose or a mount has cracked allowing the motor to "flop" around while it is running? Can you get to the unit to see it in operation?

[Midnightsun]

Source of the post Maybe the motor came loose or a mount has cracked allowing the motor to "flop" around while it is running? Can you get to the unit to see it in operation?

This was my initial though also. Check the mechanical connections between the bellows and the motor including motor mounts.

[Viper]

I agree, check the pump. While you're there, check the voltage to the pump while it's working. I was called in after a customer replaced a new pump twice due to banging and the cause was a corroded connection in the harness plug to the pump. Low voltage will prevent the motor from working properly, affecting a smooth rotation and cause a knock. I cut the plug out, connected the wires together, problem solved. I've also seen worn and or loose pump components cause the same symptom, especially at the actuator/cam from the motor to the bellows.

[denpooch]

Thank you for all of your suggestions.
I found and resolved the problem with a Dockmate.
On the shaft of the motor which in turn actuates the bellows, there is an 'eccentric' fitting which is secured by a set screw. The set screw was very loose which created a 'wiggle' with the interface to the bellows and the loud banging noise.
We tightened up the screw and now it is working perfectly.
Of course, I still have not heard back from two different Vacuflush technicians....
Take care.

[mjk1040]

Well that was shitty of them not to reply! LOL!!!