(ii) Crawler tractor: This is also called track type tractor or chain type tractor. In such tractors, there is endless chain or track in place of pneumatic wheels.

(iii) Power tiller: Power tiller is a walking type tractor. This tractor usually fitted with two wheels only. The operator, walking behind the tractor performs the direction of travel and its controls for field operation.

On the basis of purpose, wheeled tractor is classified into three groups.

(a) General purpose tractor:

It is used for major farm operations such as ploughing, harrowing, sowing, harvesting and transporting work. Such tractors have (i) low ground clearance (ii) increased engine power (iii) good adhesion and (iv) wide tyres.

(b) Row crop tractor:

It is used for furrow crop cultivation. Such tractor is provided with replaceable driving wheels of different tread widths. It has high ground clearance to save damage of crops. Wide wheel track can be adjusted to suit inter row distance.

It is used for definite jobs like cotton field, marshy land, hill sides, garden etc. Special designs are there for special purpose tractor.