PROBLEM TO BE SOLVED: To simply and easily adjust and set an operation speed of an assist cylinder related to a hydraulic continuously variable transmission.SOLUTION: A working vehicle comprises a trunnion arm 47 for switching a hydraulic continuously variable transmission 7 to a forward traveling position a neutral position, and a reverse traveling position and a hydraulic cylinder mechanism 40 for operating the trunnion arm 47. The working vehicle is constituted so as to enter an adjustment mode A for changing an operation speed of the hydraulic cylinder mechanism 40 by simultaneous operations of a prescribed plurality of operation switches 56, 58 of an operation switch group arranged at an operation panel 55 of a traveling vehicle body 1. Prescribed adjustment dials 66, 67 of adjustment dials for attachment working vehicle control or vehicle body traveling control which are arranged at the operation panel 70 are made to be common in use for a correction setting dial for correcting a duty ratio of a control valve 49 for supplying pressure oil to the hydraulic cylinder mechanism 40 in the adjustment mode.SELECTED DRAWING: Figure 8COPYRIGHT: (C)2019,JPO&INPIT【課題】油圧無段変速装置に関連するアシストシリンダの作動速度を簡単かつ容易に調整設定可能とする。【解決手段】油圧無段変速装置７を前進位置と中立位置と後進位置に切り替えるトラニオンアーム４７と、トラニオンアーム４７を作動する油圧シリンダ機構４０とを備え、走行車体１の操作パネル５５に配置する操作スイッチ群のうち、所定複数の操作スイッチ５６，５８の同時操作によって、油圧シリンダ機構４０の作動速度を変更する調整モードＡに入るよう構成し、操縦パネル７０に配置されていて装着作業機制御用又は車体走行制御用の調整ダイヤルのうち所定の調整ダイヤル６６，６７を、調整モードＡ中、油圧シリンダ機構４０へ圧油供給する制御弁４９のデューティー比を補正する補正設定ダイヤルに兼用した。【選択図】 図８
