NP233 Hub Vacuum Problem

Lots of possibilities.....and yes, the switch is operated mechanically from a shaft inside the t/case. One common problem on these was the switch would leak internally and allow oil to be pulled up into the vacuum lines and swell all the lines. You probably need to just go step by step and comfirm that you have good vacuum down to the switch...etc.

Ian

I pulled the hoses off the switch and they were all clean and no visible signs of oil. On the actuator end I was able to blow and suck on it and get air flow with moderate resistance (hoses connected to switch).

Where do the other two hoses go? I couldn't follow them very well. _________________________________________________________________ JG... Jeff Givens mailto: snipped-for-privacy@comcastXX.netXX

"My hovercraft is full of eels."

One hose is to the vacuum source, one hose to the actuator, and I believe the other hose is a vent...to release vacuum to the actuator when you go back to 2wdrive.

Ian

Damn, I was hoping one was to heating control as I'm also having some airflow problems..... _________________________________________________________________ JG... Jeff Givens mailto: snipped-for-privacy@comcastXX.netXX

"My hovercraft is full of eels."

Well, I think if you take a close look at the vacuum source, it does tee off to the inside heater controls. It's interesting, the oil in the lines problem that I mentioned will also completely trash the vacuum lines inside the vehicle. Makes a real mess of things when it does happen.

Ian

Switch was the problem, it was frozen in roughly mid-travel. No signs of oil anywhere.

Heater/AC airflow problems fixed with switch as well.

_________________________________________________________________ JG... Jeff Givens mailto: snipped-for-privacy@comcastXX.netXX

"My hovercraft is full of eels."