Auto locking hub System

kenaifun

New member
Joined
Jul 3, 2010
Messages
9
2001 F350 7.3
I have been trying to diagnose and repair my vacuume system. I am sure I have a vacuume leak somewhere. My HVAC system works like it should. ( heater/ ac controls )

I cant find a post that describes the complete system for the hubs. I cant find the specs for the vacuume pump or how the system is suppose to work.

I.E. vacuume pressure? How to service all the seals?

I get vacuume to the hub when I turn the knob, but the vacuume only lasts for a short time. The pump cycles.

I have not put a hand pump (with gauge ) on the hub its self yet to see if its holding.

I would like to know and see a document on the system.
 
I just put warn hubs in my PSD to get rid of the headaches but, they did last 180k miles. The stock hubs locked and wouldnt unlock on mine.
 
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