Causes of wear and tear in foot-operated grease pumps and how to deal with them

What is a foot operated grease pump?
Foot pump is a kind of hydraulic pump, its function is to convert the mechanical energy of the power machine into liquid pressure energy, the cam is driven by the motor to drive the rotation. When the cam pushes the plunger upward, the sealing volume formed by the plunger and the cylinder block is reduced, and the oil is extruded from the sealing volume and discharged to the place where it is needed through the check valve. When the cam rotates to the descending part of the curve, the spring forces the plunger downward, forming a certain vacuum pump, and the oil in the tank enters the sealing volume under the action of atmospheric pressure. The cam makes the plunger constantly rise and fall, the sealing volume periodically decreases and increases, and the pump continuously absorbs and drains oil. Foot operated grease pump has the characteristics of low and high pressure two-stage plunger pump drive design, fast oil output, and labor-saving operation.
Foot operated grease pump wear causes and treatment methods:
1. Internal leakage of boom cylinder. The easiest way is to raise the boom to see if it has a noticeable free fall. If the drop is obvious, disassemble the cylinder for inspection, and replace the sealing ring if it has been worn.
2. Check the operating valve. First clean the safety valve and check whether the valve core is worn, if it is worn, it should be replaced. If there is still no change after the safety valve is installed, check the wear of the valve spool of the control valve, and the clearance use limit is generally 0.06mm, and the wear should be replaced if it is serious.
3. Measure the pressure of the hydraulic pump. If the pressure is low, it is adjusted, and the pressure still cannot be adjusted, which indicates that the hydraulic pump is seriously worn.
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Post time: Dec-16-2022