A 420cc 15hp gasoline engine was used to make the trencher. The maximum digging depth is 105 cm/41 inches. A 22cm3/8cm3 two-piece hydraulic pump was connected to the engine, the 22cm3 capacity pump section was connected to the hydraulic motor that moves the digging chain and earthing augers, the 8cm3 capacity section was attached to the excavator drive. and hydraulic cylinder. An oil flow regulator was used to adjust the speed of the excavator drive and the speed of the hydraulic cylinder, so that when digging the ground, the driving speed and the arm lowering speed can be adjusted smoothly.