4x4 hubs locking
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4x4 hubs locking
I have a 2000 F350 Diesel with the ESOF. I am fairly new to the system. I have never been happy with the way the system works. If I lock the hubs manually and then shift I have no problems. If I just use the dash switch with the hubs in auto, they never seem to lock in.
When tracing for problems, I heard the vacuum pump run for about 60-90 seconds after I turned the switch on.
Does it really take this long to get enough vacuum to lock the hubs? If so, this would explain my impatience and the hubs not working properly.
Thanks for your input.
Anthony
When tracing for problems, I heard the vacuum pump run for about 60-90 seconds after I turned the switch on.
Does it really take this long to get enough vacuum to lock the hubs? If so, this would explain my impatience and the hubs not working properly.
Thanks for your input.
Anthony
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Joined: Feb 2005
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vanbuzz
i have had problems with the ESOF after two years of having the truck, still have problems with it disengaging, i feel that the design is flawed. but it sounds like you have a vacuum leak, you can replace yellow o-ring on hub, and check your tubes.
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When switch to 4hi it does not alway come on until my front wheel moves but once it is in it will go in and out with out a problem. I have not tried it with the auto hubs turn to manual. This seems to be the norm with ford that I have seen. Am I wrong?
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Joined: Jul 2002
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From: Long Island USA
With a diesel, the vacuum pump comes on when it drops below a certain vacuum in the resevior. The ESOF sends a 20 second vacuum to the hubs to lock them. There's probably a lag between the vacuum pump turning off and the hubs.
The reason there is a 20 second vacuum pulse is so that the hub will engage ... sometimes, if the teeth are not aligned properly, the hub won't lock. It helps to turn a corner or something if they are getting sticky to help line up the teeth.
My hubs are sticking, so I locked them in for the winter
No problems. Plan on lubing them in the spring.
The reason there is a 20 second vacuum pulse is so that the hub will engage ... sometimes, if the teeth are not aligned properly, the hub won't lock. It helps to turn a corner or something if they are getting sticky to help line up the teeth.
My hubs are sticking, so I locked them in for the winter
No problems. Plan on lubing them in the spring.
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Thanks for the input. Went out on the dirt road today and shifted into 4Hi with the hubs in the auto position and waited about a minute, then spun the rear tires, nothing from the front end. I knew I always had preferred manual hubs and shifting for some reason.
I had also replaced the relays under the hood last year and just checked the fuses the other day, all good.
Will check other areas next.
Anthony
I had also replaced the relays under the hood last year and just checked the fuses the other day, all good.
Will check other areas next.
Anthony
