As a general recommendation technician or equipment operator shall perform a weekly scan of the equipment to make sure it’s functioning properly.
The typical weekly Preventive Maintenance list should include, but is not limited to the following tasks:
Check hydraulic fluid levels. Add hydraulic fluid of the same brand and viscosity grade if needed using portable filters when applicable.
Check breather caps, filters, and fill screens.
Check return/pressure/hydraulic filter indicators and pressure gauges for readings.
Sample hydraulic fluid for color, visible signs of contamination, and odor.
Check system temperature using a built-in or spot infrared thermometer. If the temperature is higher than recommended by the manufacturer, check the condition of the cooler and relief valve settings.
Inspect inside of the hydraulic reservoir for any signs of aeration. Use a flashlight and look into the fill hose for any signs of foaming or small whirlpools. Aeration may be a sign of a leak in the suction line or faulty shaft seals, so it’s important to inspect the reservoir on a regular basis.
Inspect hydraulic hoses, tubing, and fittings for leaks and frays. Remember that any leakage is an environmental and safety hazard since hydraulic fluid gets hot inside the system and is highly toxic. If the fluid level gets too low, the system will operate at reduced capacity and will get overheated.
Inspect proportional/servo valves for overheating. High temperature means that the valve is sticking.
Listen to the pump for making any unusual noise. The noise may be a sign of cavitation. Cavitation is the formation of bubbles or so-called cavities in the hydraulic fluid and is caused by the air that gathers in the areas of relatively low pressure around an impeller. It damages the pump, decreases the flow, and causes vibration if not treated.
Scan the electric drive motor with a handheld infrared thermometer for hot spots.