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LW 4000 undercarriage check valve

We had check valves on our undercarriages and I removed them due to the water trapped in the line would start to stink plus if it ever froze it would blow the HP line connected to it.
 
The Vector has one to keep it from siphoning water from the holding tank. The spring check needs 5 PSI to open.
 
you need checkvalve inline to prevent line from draining out during non usage. when pump kicks on if line is empty it will cause vibration and possibly damage line or pump.
 
You want immediate response with the undercarriage, so the check valve keeps the line charged. There is a delay on the arch so no check valve is needed.
 
The reason for the check valve is to prevent water from siphoning out of the water tank while resting. Because the Arch is higher than the tank, no water will siphon from it.
 
The check is to allow for instant water at the u/c. It won't siphon on a 4000.
the outlet for the Hp arch and U/c are above the tank level on the pump station, the u/c lexair is in the closed position when machine is idle, and I would think the pump (cat or General) would inhibit flow though if its not running.
 
Hi I have rented an old gas station with a PDQ Laserwash 4000 and they don´t have the owner´s and service manual. I would like to know where can I download it.
 
Last edited:
newhampshiretech is correct - you can download owner/operator manuals from PDQ's website - www.pdqinc.com - however, you'll need to sign up for an operator account to gain access to those manuals. You can also try contacting your local distributor for the manuals as they may be able to email them to you as a PDF. If you're unsure of who your distributor is, you can use the Find A Distributor link on our website to locate one in your area.
 
PDQ Marketing said:
newhampshiretech is correct - you can download owner/operator manuals from PDQ's website - www.pdqinc.com - however, you'll need to sign up for an operator account to gain access to those manuals. You can also try contacting your local distributor for the manuals as they may be able to email them to you as a PDF. If you're unsure of who your distributor is, you can use the Find A Distributor link on our website to locate one in your area.
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Yes Newhampshiretech is right I will try to download from there
 
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