Chevrolet K20 Pickup Locking Hub Troubleshooting
Thanks to your quality Chevrolet K20 pickup locking hub, you're able to enjoy effective four-wheel drive performance through even the most demanding on/off-road conditions. For newer vehicles, this component helps drivers to automatically put their vehicles into 4WD. The locking hub is an essential part of any 4X4, and it should be kept in tiptop shape in order to guarantee smooth component and automobile performance. This auto part, however, won't last forever and is bound to wear over time. When this happens, you must diagnose the problem and solve it as soon as possible. This guarantees that your vehicle's 4WD ability will not be compromised.
Locate the locking hubs, found at the center of the front wheels. Inspect the hubs for any evidence of oil seepage, which would be a telltale sign that your internal hub gasket damaged and in need of a replacement.
Manually turn your hubs back and forth, from the "locked" to "unlocked" position (not applicable for automatic locking hubs). The hubs should ideally turn freely, so if they grab or bind, then this calls for some internal cleaning.
If you notice any grinding noises from the hubs, then find an assistant and do this simple test. Have your assistant slowly drive the vehicle while you listen for noises from the hubs. If the noise is prevalent, then that means that the locking hub has failed and that it's slipping in and out of position, creating the grinding noise.
Four-wheel drive failure
If you operate your vehicle with the hubs locked and with the 4WD engaged and yet the 4WD is not working, then the manual locking hubs have damage. When your hubs lock in, your front tires will turn without the help of your back tires. So if you have a busted hub or hubs, then one of both of your front wheel will not turn, even after you've engaged the 4WD.
Failure to disengage
Locking hubs may also fail to disengage, but this rarely happens. When it does though, the vehicle will behave as if it was in 4WD, but you'll notice some loud popping noises from the hub. If you encounter this problem, then back your ride up about six feet to help the hub disengage.