i dont know how they work, but i do know that why they would stop engaging is a few reasons,
1.not enough pressure from the slave
2.not enough lube for it to move ie. gears are frozen
3.water was gotten in and frozen the gears.
these are just a few of the problems the auto-locking hubs can have. would say put it on some jacks and see if it will enguage. as that is what i had to do to find out that mine didnt work. you can replace them with asini manual locking ones or warn manual locking or the superwinch ones. personally i like the superwinch, but many people will tell you asini is the only way to go, but good luck finding ones that are in decent shape to use and trust.
The noun forms for the verb to engage are engagement and the gerund, engaging.
Automatic door locks engage on the 2003 Ford Explorer for safety.
Automatic hubs or manual? If manual make sure they are turned all the way until it clicks into correct spot. Sometimes they get sticky and do not engage. Is it making noise when you put in 4wd? when you put it in does it still move? what are symtoms? How do you know it is not engaging?
The verb form is to engage (engages, engaging, engaged).
meta-communication
differential problem
You must first replace them with ones that work.
transmission won't engage when you push the button on john deer 155c automatic
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The brake pedal has to be fully depressed for the stick to engage.
When climbing a steep incline. The automatic transmission will always try to engage a high gear.
Me and my brother had no interest in being there, but they still tried to engage us in conversation.