0:00
Hello everyone, this time we will mainly repair the hydraulic system of the mini backhoe, replace consumable parts and perform engine maintenance to finish the machine.
0:24
Drain the hydraulic oil to overhaul the hydraulic pump and swivel joint. If you do not remove the hydraulic oil, your body will be covered with oil.
0:30
Mark the hydraulic hose so that there are no mistakes in the connection.
1:30
The cushion that transfers engine power to the pump is damaged.
2:07
The pilot pump outputs a hydraulic pressure with a small force, and this hydraulic pressure is used to control a large hydraulic pressure.
2:31
The gear pump outputs the hydraulic pressure of the swivel, swing, and soil removal plate. By separating it from the main pump, the load on the main pump is reduced.
3:26
Each input / output shaft has a thin part, which breaks when the pump breaks to prevent damage to other parts.
3:42
Axial piston pumps produce the largest hydraulic pressure, the power source for cylinders and traction motors. The oil pressure to be discharged changes by changing the inclination of the diagonal number, and oil is not discharged when the oil pressure is not required. This minimizes fuel consumption.
6:54
The role of the swivel joint is to connect the hydraulic circuit. If there is no swivel joint, hydraulic pipes and hoses will connect the oil passages, making it impossible to turn. It connects 8 types of oil channels.
8:13
An O-ring is used for the joint of the pipe, and oil leaks when it deteriorates.
8:54
The counterweight is molded with putty and painted.
9:36
I used a mobile cargo crane because I needed to hang the engine and counterweight.
11:09
The hydraulic oil is filtered by the suction filter in the tank and enters the hydraulic pump. The high-pressure hydraulic oil discharged by the hydraulic pump moves each actuator via the control valve, then the hydraulic oil is cooled by the oil cooler and filtered by the return element. Return to the tank.
12:40
The low oil pressure controlled by the pilot valve is input to the control valve and sends high oil pressure to each cylinder.
14:25
The check valve is under high pressure, so loosen it slowly.
15:37
Air is sucked from the joint of the fuel hose and the output of the engine becomes weak.
17:30
Hi, my name is Yamazaki and I run the youtube channel "Kochi Family Garage". In the video, there are two people, but in reality, I am alone. I work and edit by myself. From the next time, I would like to explain each part, thank you.

#Details in the summary section
#Restoration
#Kubota