The manual oil pump is composed of four parts: the pump body part, the handle part, the oil storage tank and the backseat part.

1. Pump body part: The pump body part is the main part of the oil pump, including high-pressure working chamber, low-pressure working chamber, two check valves, high-pressure valve (safety valve), low-pressure valve, unloading valve, two check valves, oil inlet and so on. The holes are organically linked together.

2. Two check valves prevent pressure oil backflow. The specification and function of two check valves are the same. The function of low pressure valves and high pressure valves is pressure control. The pressure was controlled at 1.5mpa and 63MPa respectively. The two steel balls at the inlet are check valves. After the completion of the work, loosen the unloading valve and the pressure oil flow back to the oil storage pipe to complete the unloading work.

3. Handle part: it is mainly composed of pressing rod and pressing handle. The pump body and plunger are connected by two pins. Hand power ACTS on the pressure rod and drives the plunger to reciprocate and produce oil pressure.

4. Oil filling and vent holes are installed in the back seat or above the tank. Loosen the screw to allow bleed air and intake air. Open the air valve when in use.