4 Wheel Drive Selected, but Not Working! Diagnosing Vacuum Actuated 4WD Hubs

4 Wheel Drive Selected, but Not Working! Diagnosing Vacuum Actuated 4WD Hubs


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Do you have a truck or SUV with a selector switch, dial, or button to turn on 4 wheel drive? Does it seem like nothing happens when you try to use it? In this video, Andy diagnoses and then repairs the vacuum seal in a front hub on a Ford Super Duty F-350. In this application, vacuum is used to engage the front hub splines, which locks the wheel with the front drive shaft when 4 wheel drive modes are selected. Andy walks through testing the vacuum lines for leaks, and he discovers that the problem this time is in the hub itself. He replaces the vacuum seal in the hub, and then confirms the 4 wheel drive selector is working again.

Check out this playlist for more great diagnostic videos:
http://www.youtube.com/playlist?list=PL17C5A3ED23485B90

For More Info visit us at http://1aau.to/h/cQK/

⚠ DISCLAIMER:
While 1A Auto strives to make the information provided in this video as accurate as possible, it makes no claims, promises, or guarantees about the accuracy, completeness or applicability of the content. No information contained in this video shall create any expressed or implied warranty or guarantee of any particular result. All do-it-yourself projects entail some risk. It is the sole responsibility of the viewer to assume this risk. 1A Auto is not responsible or liable for any loss damage (including, but not limited to, actual, consequential, or punitive), liability, claim, or any other injury or cause related to or resulting from any information posted in this video.

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