An exhaust treatment unit includes an exhaust treatment device that treats exhaust gas from an engine of a work vehicle, a bracket including an attachment portion attachable to a hoisting hook, and a detachable component. The bracket supports the exhaust treatment device. The detachable component is attachable to and detachable from the attachment portion. When the unit is attached, the hoisting hook is attached to the attachment portion, the unit is hoisted using a hoisting tool including the hoisting hook, moved to an attachment position and installed in the work vehicle. The hoisting hook is then detached from the attachment portion and the detachable component is attached to the unit using the attachment portion. When the unit is detached, the detachable component is detached from the attachment portion, the hoisting hook is attached to the attachment portion, and the unit is hoisted and detached using the hoisting tool.