Hydraulic System Maintenance Instruction
Hydraulic System Maintenance Instruction
Hydraulic System Maintenance Instruction
Hydraulic machines power the moving parts of many industrial machines by applying the force of a fluid under pressure. Some systems are very small and simple, others are high pressure versatile systems with complex servo valve and pump sequences. Regardless of size or complexity, proper maintenance of BOTH the system and hydraulic fluid is crucial to maximizing uptime and reducing repair costs.
In order for a hydraulic system to work properly and be efficient, the given assembly, working advice and recommendations must be followed strictly. Necessary precautions should be taken for the cleaning of all hydraulic circuit elements. The oil used meets the norms of the company in terms of both quality and cleanliness.
must be appropriate. The hydraulic oil type deemed appropriate in this hydraulic system is ISO-32-ISO-68, and the same brand and type of oil should be used during the first start-up and for possible future reinforcements.
Hydraulic System Cleaning
In order for the hydraulic system to be commissioned smoothly and to maintain its performance, the tank, pipe and hose installation should be flushed after the installation and the oil to be used should be filtered according to the following norms depending on the application:
On-off Valves …………… ISO 19/17/14, NAS 8
Proportional Valves …………… ISO 17/15/12, NAS 6
Servo Valves …………… ISO 15/13/10, NAS 4
Commissioning the Hydraulic System
The motor should be driven in accordance with the rotation direction of the hydraulic pump. The suitability of the electrically operated device and the motor with the supply voltage and amperage should be checked. All technical features of the Hydraulic Power Unit are available on the label on the tank. Hydraulic circuit diagram is given with the unit with its Maintenance and Instruction.
Hydraulic Oil Pressure Adjustment
Pressure settings are made when the pump is operating at its normal speed. Settings should be made slightly above the working pressure of the system (approximately 10 bar). Higher setting values adversely affect operating efficiency. The pressure setting should be done by slowly increasing after the hydraulic users (Hydraulic Cylinder, Hydraulic Motor) complete their stroke. After the desired pressure settings are made, it is fixed with the help of counter nuts. These pressure values are not changed unless needed.
Checks to be Made Before Commissioning the Hydraulic System
Inspection measures should be detailed in a specific list created for each system, so that each measure should be implemented by personnel with various levels of training. The most important audit matters include the control of:
Level Control in Hydraulic Oil Tank
Hydraulic Cooler (Heat Exchanger) efficiency (air-water) Control
Checking the impermeability of the hydraulic system and leakage to the external environment by visual inspection.
Control of the temperature of the hydraulic oil used
Hydraulic System Pressure Values Control
Hydraulic Cylinder Speed Control and Hydromotor Speed Control
Insulation control of electrical connections
Calibration check of PED safety valves: these devices will be checked and recalibrated by end users at intervals determined according to existing rules.
Fluid loss control as a result of hydraulic leakage
Chemical characteristics control of hydraulic oil
Control of hydraulic oil contamination