The hydraulic oil replacement cycle in die casting machines varies depend on the equipment type and working conditions usually every 2000 hours.

The hydraulic oil replacement cycle for most die-casting machines is typically every 500 hours, followed by every 2000 hours (or annually). In high-temperature, dusty environments, or when using standard anti-wear oil, the replacement frequency should be shortened to 500-1000 hours or every six months.

Regular monitoring of oil temperature, color, and filter condition allows for flexible adjustment of the replacement frequency based on actual operating conditions, ensuring hydraulic system reliability and machine life.

We will discuss hydraulic oil replacement cycle in die casting machines mainly from below aspects:cold chamber die casting machine, hot chamber die casting machine hydraulic oil replacement cycle. Maintenance and inspection of hydraulic oil and other notes.

Cold chamber die casting machine

The hydraulic oil of the cold chamber die casting machine recommends to replace every 2000 hours under normal operation. When replacing the high-performance anti-wear hydraulic oil, it need thoroughly clean the oil tank to avoid contamination.

Further supplement, the hydraulic oil need filter after 500 hours of operation in a new machine. And then replaced with new oil after 1500 hours. In addition, the hydraulic oil filter need to replace once a year to ensure the cleanliness and performance of the system.

Shutdown and Cooling

Turn off the machine and allow the hydraulic oil to cool to room temperature.

Draining Oil

Open the drain plug at the bottom of the oil tank and drain all the old oil into a container.

Cleaning the Oil Tank

Check the inside of the oil tank for impurities such as iron filings and dust. If necessary, rinse with a cleaning agent and allow to dry thoroughly.

Replacing the Filter

If using a replaceable filter, replace or clean it according to the manufacturer’s instructions.

Refilling with New Oil

Use the recommended specification hydraulic oil and add oil according to the oil level indicated in the machine manual.

Air Bleeding

Start the machine and run it at low speed for several minutes to purge air from the system. Check the oil level and top up if necessary.

Checking Oil Temperature and Pressure

After operation, monitor whether the oil temperature is within the range of 35℃–55℃ and whether the oil pump noise and pressure are normal.

Hot chamber die casting machine hydraulic oil replacement cycle

The hydraulic system of the hot chamber die casting machine usually works under high pressure and high temperature conditions. So it need pay special attention to the replacement cycle of the hydraulic oil. It is mentioned that the cooling and lubrication of the hydraulic oil is essential to maintain the performance of the equipment and extend the service life.

Although the specific replacement cycle of the hydraulic oil of the hot chamber die casting machine does’t clearly mentioned. It can be inferred that its replacement cycle may be similar to that of the cold chamber die casting machine. That is, every 2000 hours or according to the condition of the equipment.

A two-pronged approach

• “timely replacement + quality maintenance”, even after 1 year or 2000 hours, oil quality monitoring should be conducted to confirm that the oil is still within an acceptable range.
• If the oil quality is still good, the replacement interval can be appropriately extended (but it is not recommended to exceed 3 years).

The filter is key to extending oil life

Keeping the filter element clean can extend the oil’s lifespan by 3-4 times. In practice, it is still recommended to replace the filter at the same time as each oil change to prevent the old filter element from recontaminating the new oil.

Crucial temperature management

Oil temperatures exceeding 55°C will significantly accelerate oil oxidation. It is recommended to install a temperature alarm or automatic regulating valve on the oil cooling system.

Records and traceability

Establishing a complete maintenance log helps in later analysis of oil aging trends, optimizing replacement cycles, and reducing the risk of unplanned downtime.

Maintenance and inspection of hydraulic oil

The cleanliness and quality of hydraulic oil directly affect the performance and life of the equipment. It is recommended to regularly check the contamination level of hydraulic oil and replace or test the hydraulic oil as needed. If the hydraulic oil fails the test, it should be replaced immediately.

The hydraulic oil need replace after the first 500 hours of operation. And the quality should be checked every 1000 hours thereafter. If any abnormality is found, new oil needs to be replaced.

Oil Level

• Observe the oil level gauge or dipstick; confirm the oil level is within the specified range.
• Below the lower limit → Add oil; Above the upper limit → May cause spillage.

Oil Color/Transparency

• The color should be a clear pale yellow or pale red; no obvious black, emulsified, or metallic particles.
• Darkening of color, emulsification → Replacement required.

Odor

• Normally there should be no pungent odor; a burnt or sour smell indicates the oil has oxidized or been overheated.
• Unusual odor → Replacement required.

Filter/Screen

• Check the filter for blockage, metal shavings, or dust.
• Dirty/Clogged Filter → Replace the filter and oil simultaneously.

Fuel Tank Interior

• Clean the bottom of the fuel tank of sediment and check for moisture or rust.
• Sludge or moisture at the bottom → Must be cleaned and oil changed.

Other notes

It is emphasized that the cleanliness of hydraulic oil is crucial to the performance of the die casting machine. So when replacing the hydraulic oil, the oil tank should keep clean and the oil with the same specifications as the original hydraulic oil should use. Hydraulic oil should replace every 2,000 to 3,000 hours, or at least once a year.

• Comprehensive analysis shows that the hydraulic oil replacement cycle of cold chamber die casting machines is usually once every 2000 hours.
• While the hydraulic oil replacement cycle of hot chamber die casting machines may be similar. But the specific cycle need adjust according to the actual use of the equipment and the manufacturer’s recommendations.
• At the same time, regularly check the cleanliness and quality of the hydraulic oil to ensure that the correct type and specification of hydraulic oil are used to extend the service life and performance of the equipment.

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