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Manual locking hubs |
Locking hubs - Wikipedia.Locking hubs - Wikipedia
Red lines indicate rotating parts. In 2WD with locking hubs engaged front drive shaft, front diff and front axle, rear drive shaft, rear diff and rear axle are rotating. Front tires are rolling along since connected to the axle, they make the front drive line parts rotate - only rear tires are pulling. In 4WD with hubs disengaged front drive shaft, front diff and front axle, rear drive shaft, rear diff and rear axle are rotating.
Front tires are rolling along the transfer case makes the front drive line parts rotate, but since the wheels are disconnected the power flow does not reach the tires - rear tires are pulling.
In 4WD with hubs engaged front drive shaft, front diff and front axle, rear drive shaft, rear diff and rear axle are rotating.
Front tires are pulling - rear tires are pulling. Expert 4WD seminars. When should you lock your hubs? When should you unlock them? Could you leave them locked? Furthermore, locking hubs can help to reduce noise and vibration, making for a more comfortable ride overall. This makes them particularly useful for offroad vehicles and trucks, as offroad tracks can be extremely uncomfortable to drive over.
Locking hubs can be activated manually, or automatically. If your car has manual locking hubs, you will have to decide for yourself whether to disengage the four-wheel drive system. This will involve turning the ignition off, getting out of your car and actually rotating the hub. The alternative to manual locking hubs is automatic locking hubs. They work very differently and have their own pros and cons. Old designs are not able to change driving modes whilst the car is moving. Modern automatic designs use a one-way clutch system to change drivetrains.
Newer designs are able to do this thanks to a vacuum diaphragm, which allows the collar to move whilst the car is in motion. Ultimately, both types of locking hubs are great in different situations. Go to discussion What are locking hubs? Manual locking hubs If your car has manual locking hubs, you will have to decide for yourself whether to disengage the four-wheel drive system.
Benefits of manual locking hubs Reliability. Manual locking hubs are generally regarded as more reliable than automatic locking hubs. Mechanically activated locking hubs are activated by hand by turning a switch on the end of the axle.
The advantage to mechanical hubs is that they are often considered more robust, and less prone to issues due to maintenance negligence. The disadvantage of this is that the driver needs to get out of the vehicle to activate the hubs. In some other vehicles, automatic locking hubs are used which, as the name implies, engage automatically when 4WD is engaged.
The main advantage is that the driver does not need to leave the vehicle to connect the wheels to the axle. The disadvantage with this system is that most designs require the vehicle to move some distance usually a whole wheel turn, often going backwards after engaging the hubs in order for the hubs to engage or disengage. This might not be possible if the vehicle gets completely stuck before the hubs have been engaged, meaning automatic hubs require more caution on the driver's part.
Also, in some axle designs such as those used on older Land Rovers , the top swivel bearing can become starved for lubrication which is normally supplied by oil slung up by the rotating axle , unless the hubs are locked every few hundred miles.
Also, since locking hubs generally do not require a key to operate, they can be maliciously locked or unlocked by persons other than the vehicle owner. Jump to content Navigation.
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