In practise we lock the hubs whenever we anticipate the potential for having to use four-wheel drive and generally whenever you drive on unsealed roads. There is nothing worse than having to climb over the bonnet or wade through knee deep in mud to lock the hubs because you didn't get through that last washout in 2WD. We will normally drive on the highway with the hubs in the free position and lock when drive on unsealed roads.
Part-time four-wheel drive vehicles are designed to operate in conditions of poor traction, on steep hills and on loose or unreliable surfaces. Making tight turns on bitumen or concrete can damage drive line components and wear out tyres.
A part-time four-wheel drive rotates the front drive shafts and rear drive shafts at the same rate. The front wheels need to rotate at a greater rate than the rear wheels to make a turn. Because the front and rear drive lines are coupled and operating at the same rate things begin to get ugly.
Steering becomes difficult as the front end 'understeers' while the drive line starts to 'bind'. Something has to give and this 'driveline binding' will result in jerky movement, tyre spin and eventually component failure. Usually expensive components like axles, differential gears or transfer gears. Driving in four-wheel drive on sealed surfaces is to be avoided unless the car is designed as a constant 4WD.
If your car has freewheeling or automatic locking hubs it is a part time 4x4. Ian Van Munster is a 4WD instructor and has many years driving trucks and road trains to remote locations in the Northern Territory. Get notified about new training courses and exclusive offers. Have a general enquiry or need to get in touch? When they are unlocked, you do not have the ability to put your vehicle into 4WD.
Newer 4x4 vehicles are manufactured with automatic locking hubs. This enables you to be able to "shift on the fly" into 4WD. The process to this is complex, yet simple in explanation. When the shift lever is moved into position, the changing gear creates an inertia that "locks in" the hubs. When you "lock in" your hubs, you are connecting the two half axles to a drive plate that locks them together, making them turn as one unit.
They will spin freely together, ready for you to engage the 4x4 which will send drive power to them via a differential from the transfer case. This red and black GU Patrol not only looks awesome, the engine upgrades are quite impressive and keep in mind Your 4x4 Protection Plan MaxTrax vs.
Manual And Automatic 4x4 Hubs. You might like these. Your 4x4 vehicle. The axle shaft should now turn with the wheel if the hub is locked. If the hub fails to lock, the hub will have to be disassembled and inspected or replaced. To check release, hold the axle shaft steady and rotate the wheel backwards. You should hear a click as the locking mechanism slides back out and disengages the hub. Rotate the wheel forward again and it should turn freely. Another way to check the hubs is to raise the vehicle on a frame contact lift so all four wheels are off the ground.
Then start the engine and place the transfer case in four-wheel drive and the transmission in drive. If the front driveshafts are not turning when the transfer case is in four-wheel drive, the problem is inside the differential broken side gears or the transfer case broken chain, shift linkage, etc.
If the driveshaft between the transfer case and differential is turning, the problem is in the differential. If the driveshaft is not turning, the vehicle is going to need repairs to the transfer case. To service the hub, some disassembly is required. The outer hub cover is usually attached to the hub with five or six Torx screws.
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