[Seymour Sunshine]

Hi Guys. I'm getting back into window cleaning after an absence of a few years.
 
I've just bought a WCW backpack. It doesn't cut the motor when I shut off the water using the pole-mounted tap. Is this a feature of these backpacks or is there an adjustment I can make to the pressure switch on the end of the pump? (It's brand new so I haven't tried opening it up yet, so don't even know if there is one!)

[Jonny 87]

I’m not sure but it sounds like there’s a bypass valve somewhere to stop pressure build up.

[Seymour Sunshine]

Just found a YouTube video of Wagga when he got his backpack. It's the same model. At about the 5-minute mark he shows how it switches off when the pole tap is closed and it's up to pressure.

https://www.youtube.com/watch?v=LVuY0Sr2dDI

[Seymour Sunshine]

After a few acrimonious emails, They have offered to replace the backpack. The item clearly does have a cutoff ... it just didn't cut off!

Here's a link to the manufacturer's website. The second picture clearly shows the presence of a cutoff and the specification mentions it as well, as does the handbook.

http://kobold252.en.made-in-china.com/product/SKgJryuoAPhX/China-20L-Battery-Sprayer-Diaphragm-Pump-12V-Electric-Knapsack-Sprayer.html

Anyway, thanks to WCW for a successful outcome.