CHECK OUT THE REASON WHY TRACTORS DO NOT HAVE SUSPENSION SYSTEM !!

First its required to get know what are things affected by a suspension system.

If a suspension is installed in a vehicle , then the vehicle will not have constant motion body. The body tend to oscillate in the direction of axis of the spring.

This oscillation can change ride height while operating . The condition may be while working or moving.Well tractors are supposed to maintain a constant depth in ploughing/digging. For this it requires the movement of the body to be restricted so that we do not disturb the main tractor functions.

If we have a suspended tractors which bounces too much over undulations in a field then we can't expect to have a constant ploughing depth which is a requirement in agriculture.

Suspensions also affects the off road stability.

As the speed of the tractor is less and the tyres big(which absorbs more shocks),the need of suspension is felt less.