Mark VII undercarriage spray

[Shine on]

Hi Team appreciate any feed back, really new to this amazing business. I have a 2012 Mark 7 machine that holds up quite well, Right now my undercarriage spray doesn’t stop when it goes through high pressure passes, so depending on the package it activates a few times during there cycle. I don’t have a manual to figure out what I should be looking for. Any suggestions on where I can possibly start? Please and thank you

 

[Waxman]

Sounds like you have a solenoid sticking open that goes to the underbody spray. I don't have that type of machine but on my old machine there was a manifold on the high pressure pump. You can see where the underbody hose branched off and there was a solenoid that opened and closed for the underbody

 

[chaz]

Yep….need to find the solenoid needs cleaning or replacing. Could also be the mac valve (air operated) needs cleaning or replacing. That switches with air pressure to feed high pressure rinse or UC. I have a GT 700….its on drivers side mid height on left panel

 

[Gary D]

Shine-on: Hope this helps I have one too and they are way over engineered with little service help

 

[M7T]

Post a picture of your Gantry and Pumping Water Plant to see what kind of equipment you have. Like others said, it could be a broken solenoid valve or a bad Apollo valve, or air not coming properly to the Apollo to keep it fully closed.