Yes, you can adjust the water level on a SQ/Huebsch front loader.
The thread for it is below... There are two screws to adjust and they both must be adjusted the same amount.
Please keep in mind that adjusting the water level may require replacement of the pressure switch if you mess it up. Fortunately, a new pressure switch isn't too expensive. I wouldn't dare try to get a tampered pressure switch replaced under warranty, if only for the fact that it wouldn't be fair to make Alliance pay for your mistake.
Also, make sure you run an empty load and "Supervise" the machine to determine if your adjustment made a difference and gets you the desired water level. Two full turns clockwise will get the water level up to the top of the inside drum, but still should keep it low enough that if you have to open the door, water won't spill out of the machine.
Front loaders work on the concept of splashing highly concentrated dissolved detergent water through the clothing, so please keep in mind that increasing the water level will decrease washing performance, but it will increase rinsing performance, depending on how far you adjust. I think the Alliance engineers knew this and got around this problem by adding in an "Extra Rinse" switch, which also does the same thing as a higher water level with less rinses. (These machines only do two rinses, three with extra rinse selected.)
The downside to SQ/Huebsch machines is that they do not have two pressure sensors, they really should have one for washing and one for rinsing.. Since they only have one, you have to pick a water level which gets you the best of both worlds.
I'm sure that anyone reading this from Alliance would not condone adjusting the water level as I'm sure their engineers have already adjusted it properly from the factory for the best washing performance.
IMO, You should just buy one of these machines and see how it performs with the stock water level adjustment and only adjust it if you find that the rinsing performance isn't to your liking. (ie. Lots of detergent smell still in the clothing.) However, ONLY do this with the realization of what can happen to washing performance. It is easy enough to revert the change if you need to.
Jeff & Tom pointed out to me I flubbed the original instructions for tweaking your SQ washers! So after going back and trying to read what I posted even I got confused. So here are the corrected easy instructions for upping your water levels and throwing out your warranties!! There are only...
www.automaticwasher.org