I am not a fan of front chains. Take a look at the small driveshaft that provides power to the front axle, and you will see why you do not want to be pulling the tractor around from the front. The front axle in my opinion is meant to "assist" or "help" pull the tractor when the need arises, and adding chains will provide to much traction.
The MFWD (mechanical front-wheel drive) system is different from standard 4WD (4 wheel drive) systems because the sizes of the front and rear wheels are different. The gear and tire sizes in the MFWD system determine how fast the wheels turn in relation to each other. If you change the front tires size then they will be either turning faster or slower that the rear.
When turning, the inside and outside tires will be turning and different speeds also, that is why you can feel the "binding" while turning sharply with MFWD (or 4WD) engaged. For this reason it is imperative that the inside wheels can slip a little, and chains can prevent that also. When there is to much traction-like from operating on asphalt or other hard surfaces with MFWD engage you can break u-joints if your lucky, axles or gears if your not. The picture below show the difference in tire paths in a tight turn.
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Lastly, there is usually not enough room anyway to even try installing chains since the front wheels turn so far. The loader mounts and or steering linkage/cylinders are usually in the way.