Tractor

1 . A tractor comprising:

an engine space defined by an engine hood;

an engine in the engine space;

an exhaust gas cleaner in the engine space to clean exhaust gas from the engine;

a controller in the engine space and configured or programmed to clean the exhaust gas;

a casing containing the controller; and

a rotary fan positioned forward of the engine to supply engine cooling air; wherein

the controller is in a back portion of the engine space and laterally outward of the engine relative to a body of the tractor.

2 . A tractor comprising:

an engine space defined by an engine hood;

an engine in the engine space;

an exhaust gas cleaner in the engine space to clean exhaust gas from the engine;

a controller in the engine space and configured or programmed to clean the exhaust gas;

a casing containing the controller; and

a hood holding frame to which the engine hood is attached so as to be swingable to be opened and closed; wherein

the casing is attached to the hood holding frame.

3 . The tractor according to claim 2 , wherein the casing includes:

a casing body attached to the hood holding frame and holding the controller; and

a casing lid to open and close the casing body and attachable to and detachable from the casing body from laterally outward relative to a body of the tractor.

4 . The tractor according to claim 3 , wherein

the casing body includes a body edge wall extending from an edge of the casing body;

the casing lid includes a lid edge wall extending from an edge of the casing lid; and

with the casing body closed by the casing lid, the body edge wall and the lid edge wall overlap with each other in a direction from inward to outward relative to the casing.

5 . The tractor according to claim 4 , wherein with the casing body closed by the casing lid, the lid edge wall is outward of the casing body relative to the body edge wall.