Typically, Piston Pumps And Motors Use Mineral Oil As Their Working Fluid, So Seals Made Of Nitrile Rubber Are Often Used. However, If Operating In High-Temperature Environments And Using Flame-Retardant Hydraulic Fluids, Seals  Made Of Fluororubber Should Be Used.

Before starting the hydraulic system, the pump or motor housing must be fully filled with clean hydraulic oil. Furthermore, the system must be unloaded and the on and off button pressed several times before continuous no-load operation. This is to expel as much air from the system as possible. During the loading process, there should be no unusual vibration, noise, or leakage. If this occurs, stop the system immediately, inspect, analyze, and troubleshoot.

This Usually Happened While The Drive Shaft Oil Seal Or Gasket Is Damaged, Or The Seal Is Not Securely Installed. Replace The Seal And Reinstall It Correctly.