The difficulty of enabling the differential lock on Chevrolet Niva is quite enough. It is not a sign of breakage but a design feature of a site developed by technical standards for the late seventies of the last century. Because locking occurs frequently in everyday life, it makes sense to spend time designing the mechanism separately.
There are a number of tricks that enable locking: back-to-back, start, transition to first gear, and then locking is turned on when the clutch is pressed.
As an alternative way of locking the forward motion at very low speed. There are many such ways, and they are all based on the principle of changing the position of the gears of the mechanism of the dislocation of each other.
