LOML and I have been having hydraulic issues with our new (to us) 2004 Winnebago 33v with 2 slides. The HWH system wouldn't lower levelers OR extend slides.
I looked all over the forums here and saw mention of the Shuttle Valve in more than one conversation but today I found a FAST, EASY way to check this out and at least get slides working.
After making a visit to my closest friendly HWH "authorized" shop and being told "you need a new pump", I decided to go through the HWH Trouble Shooting Manual one more time. In conjunction with this, I placed a call to HWH Tech Support and "got in line" to talk to the gurus. Frank called today and I told him the symptoms: Levelers either S-L-O-W to descend or not at all, 2 slides not extending at all. I told him where I was in the trouble shooting process, and he agreed with the Shuttle Valve. "Do you know where the pump is?" he asked. I said yes and that I
did have the 9/16" wrench he requested. Using this wrench, Frank had me disconnect the end of the "U" shaped tube that runs from the manifold to the "Shuttle Valve" and just leave the other end attached to the "Shuttle Valve". Now here's the brilliant part: Go to the closest Jack... Most levelers have a TEE fitting at the top with the hydraulic line
IN and a cap on the
OUT side. Take off the cap that covers this other half of the TEE fitting at the top of the levelers (
NOTE: I had to use a cheater to finally "break" the cap loose - make sure you're turning counter-clockwise). This cap may then be used to cover the elbow that was exposed in the first step. This cut the flow of fluid to the levelers but enabled the slides 100% of the time

Finally, Frank had me cover the leveler's TEE fitting I "borrowed" the cap from in the first step with some duct tape to keep dust out..
We have a new shuttle valve on order and and it should be here right after we get back from our very first outing this weekend

Mark (& Dawn) Ewell