SUPPORT SHAFT MEMBER MOUNTING/DISMOUNTING STRUCTURE FOR WORKING MACHINE

A work vehicle such as a backhoe having a cabin disposed on one side of excavator equipment and a tank unit disposed on the other side of the excavator equipment involves a problem that versatility is poor when a boom bracket constitutes a lower part of a side wall of the cabin, and in addition, even when the boom bracket is formed as a member separate from the cabin, a component part of the cabin needs to be removed at a time of replacement of a boom fulcrum pin, etc. Provided is a backhoe 1 including: excavator equipment 4 provided with a first boom 20 having its proximal end portion 20a coupled to a rotatable boom fulcrum pin 45; a cabin 8 disposed on one side of the excavator equipment 4; and a tank unit 9 disposed on the other side of the excavator equipment 4, wherein the excavator equipment 4 and the cabin 8 are formed as separate members, and a right side wall 8A of the cabin 8 on the excavator equipment 4 side has a work hole 49 opened therein, such that the boom fulcrum pin 45 is installable and removable through the work hole 49 by inserting and extracting the boom fulcrum pin 45 from the cabin 8 side into and out of a cylindrical body 75 having the proximal end portion 20A fixed thereto.