动力换档变速箱齿轮
power shift transmission gear
拖拉机变速箱速档变换点
tractor transmission speed shift point
四档变速箱换档机构
four-speed gearbox shift mechanism
四档变速箱元件
four-speed gearbox component
变速箱速档选择杆
transmission gear selector lever
变速箱速档选择器
transmission gear selector
七档变速箱档位选择器
seven speed transmission gear selector
拖拉机变速箱速档
tractor transmission speed
拖拉机变速箱速档位置
tractor transmission speed position
变速箱变速杆
transmission gearshift lever
transmission shift lever
transmission speed shift lever
变速箱变速杆调整
transmission shift lever adjustment
变速箱变速杆对中
transmission shift lever alignment