Due to the current variety of hydraulic pumps in injection molding equipment, the same type of pump is affected by factors such as power, speed, pressure, flow, metal material, etc., making the selection of hydraulic oil more complicated. In general, low pressure pumps can use HL oil, and medium and high pressure pumps should use HM oil.
The lubricating oil's lubricity (wear resistance) is the order of the three major pumps. The vane pump > plunger pump > gear pump. The hydraulic system of the vane pump as the main oil pump should be HM oil regardless of the pressure. Because the contact and movement between the vane and the stator of the vane pump are extremely easy to wear, the steel-to-steel friction material is most suitable for high zinc. HM anti-wear hydraulic oil.
For gear pumps, HH, HL, HM oil can be used, but high-performance gear pumps should use HM oil. For combination systems such as vane pumps and other pump combinations, the vane pump should be the main choice. When the other pumps are plunger pumps, the selected oil should also be accepted by the plunger pump. Taken together, HL oil is usually preferred for axial piston pumps, but not for vane pumps. High zinc HM oil is suitable for all types of vane pumps. Ashless HM oil is suitable for axial piston pumps with copper and silver components, as well as medium and low pressure vane pumps, but not for high pressure vane pumps. Low-zinc HM oil is suitable for a wide range of applications, both for medium and high pressure vane pumps and for plunger pumps with copper and copper parts. Reasonable selection of hydraulic fluid is only the starting point for the normal operation of hydraulic equipment. During the operation of the system, the performance change of hydraulic fluid should be detected in time to ensure proper maintenance in time to prolong the service life of hydraulic fluids, systems and components. Avoid system failures or even accidents caused by working media.
The service life of hydraulic oil (ie oil change period) is different due to different types of hydraulic oil, working environment and system operating conditions. The oil is reasonable, the oil quality is excellent, and it has hydraulic system and hydraulic fluid. With good maintenance and management, the oil change period can be greatly extended.
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