HWH Jacks won't go down

Dachristianman wrote:
I have the 301 series.

When looking at the diagrams, it appears that if the slide goes out but the jacks won't go down, it can only be the shuttle valve. I could be wrong, but that appears to be the only thing different between the jacks and the slide. Can anyone confirm?

Tom

Shuttle valve only fails on retract. You and others are mistaken when you think there is a correlation between the slides operating and the Jacks operating. ALL you are confirming with the slide operation is that the pump does run and is putting out 3000 psi. Even tho they use the same reservoir and pump, the slide system IS separate from the operation of the jacks. The controls for the jack solenoids and level function are not part of the Slide system. At this point, you need to open just 1 of the jack solenoid manual retract nuts on the end of the solenoid and then activate the pump. IF one of the jacks extends then you have a electrical problem to the solenoids OR all 4 solenoids have burnt out. What would cause all 4 solenoids to burn out? On a 300 series system if one or more of the jacks failed to fully retract and you left the system in retract for more than 15 minutes, that will burn out all 4 solenoids. The Jack solenoids are not built for continuous duty and too long having 12 volt power to them will burn them out. This is not likely, but you seem to have a failure of all 4 jacks. That is why, before you go any further, you open those manual solenoid nuts. You can open all 4 and when you activate the pump all 4 will go down, slowly but they will move. Your year should have the Plexiglas control board mounted on the pump. If you go to HWH and look at the service manual for the 300 series it will show you what each LED light on the board means and what a LED NOT lit means. There are numerous Mini ATC fuses on the board and multiple quick connects on the outside of the housing. Make sure all are snug and tight. Doug