The YB series plunger pump is a pump that uses the plunger to reciprocate in the pump cylinder to change the volume between the plunger and the pump wall, repeatedly inhale and discharge liquid and increase its pressure.
1. The output flow of the hydraulic pump is insufficient or does not output oil
(1) Insufficient intake. The reason is that the resistance on the suction line is too large or the oil supplement is insufficient. If the pump speed is too high, the liquid level in the oil tank is too low, the oil inlet pipe is leaking, and the oil filter is blocked.
(2) The leakage is too large. The reason is that the gap of the pump is too large and the sealing is not good. If the oil distribution plate is scratched by metal fragments, iron filings, etc., the end surface leaks oil; the sealing surface of the one-way valve in the variable mechanism is not well-matched, and the bearing surface of the pump body and the oil distribution plate has blisters or scratches. The damaged part of the pump can be judged by checking the foreign matter mixed in the hydraulic oil in the pump body.
(3) The tilt angle of the swashplate is too small, and the pump displacement is small. This requires adjusting the variable piston to increase the tilt angle of the swashplate.
Zhongtuo YB series plunger pumps
2. The oil discharge is not zero in the neutral position
The inclination angle of the swash plate of the variable axial piston pump is zero, which is called the neutral position, and the output flow of the pump should be zero at this time. However, sometimes the midpoint deviates from the midpoint of the adjustment mechanism, and there is still flow output at the midpoint. The reason is that the position of the controller deviates is loose or damaged, and needs to be reset, tightened, or replaced. This phenomenon can also be caused by insufficient pump angle maintenance and wear of the inclined trunnion.
3. Output flow
Fluctuating Output flow fluctuations are related to many factors. The variable pump can be considered to be caused by poor control of the variable mechanism, such as foreign matter entering the variable mechanism, marking step marks, abrasion marks, and scars on the control piston, resulting in unstable movement of the control piston. Insufficient amplifier energy, damaged parts, and poor performance of control piston dampers containing springs will cause the control piston to move unstable. Unstable flow is often accompanied by pressure fluctuations. Such failures generally require disassembling the hydraulic pump, replacing damaged parts, increasing damping, increasing spring stiffness, and controlling pressure.
4. Abnormal output pressure of the YB series plunger pumps
The output pressure of the pump is determined by the load and is approximately proportional to the input torque. There are two types of faults for abnormal output pressure.
(1) The output pressure is too low. When the pump is in the self-priming state, if the oil inlet pipe leaks or the hydraulic cylinder, one-way valve, reversing valve, etc. in the system have large leaks, the pressure will not rise. This requires finding out where the air is leaking, tightening, and replacing the seals to increase the pressure. If the overflow valve is faulty or the adjustment pressure is low, and the system pressure cannot rise, the pressure should be adjusted again or the overflow valve should be repaired. If there is a large amount of leakage between the cylinder body of the hydraulic pump and the valve plate, in severe cases, the cylinder body may be broken, the mating surface should be reground or the hydraulic pump should be replaced.
(2) The output pressure is too high. If the circuit load continues to rise, the pump pressure continues to rise, which is normal. If the load is constant and the pressure of the pump exceeds the pressure required by the load, check hydraulic components other than the pump, such as directional valves, pressure valves, transmission devices, and oil return pipelines. If the maximum pressure is too high, the relief valve should be adjusted.
Conatct: summer@ztmineequipment.com