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10-step method for screw air compressor oil change process

No matter how good the quality and advanced performance, the machine needs to be carefully maintained. As the application of screw air compressors becomes more and more extensive and the frequency of use increases, the maintenance of air compressors becomes more and more important. Efficient and timely replacement of lubricating oil is a very important part of daily maintenance of air compressors. In order to standardize the oil change process of air compressors, this article makes a brief introduction in graphic form for reference by industry practitioners.

General requirements for oil change process

Strictly abide by the recommended service cycle of air compressor lubricating oil, and appropriately shorten the oil change cycle according to the actual working conditions on site. If you need to extend the oil change cycle, you need to send samples for testing. Strictly abide by the oil change process of air compressor lubricating oil, exhaust the old oil as much as possible to prevent the new oil from being contaminated and causing unnecessary problems. When replacing oil products, you must also replace related spare parts, including air filters, oil filters, etc. Machines that have gelled must be thoroughly cleaned and flushed.

Ready to work

Before the maintenance of the air compressor, you need to prepare the necessary tools, including: safety protection tools, disassembly tools, oil change tools and spare parts. Before changing the oil, you should arrange the tools you need on site neatly, in an orderly manner and easy to take!

The first step: tool preparation

Safety protection tools: personal labor protection supplies are neatly dressed (hard hats, work clothes, oil-proof shoes, gloves, etc.); on-site fire fighting equipment;

Disassembly tools: various wrenches; steel brushes; scrubbing silk wool; lighting devices, etc.

Oil change tool: container for connecting waste oil, special oiling device (pump or special oiling funnel)

Spare parts: Spare parts that need to be replaced, including three filters, valves, gaskets, bolts, etc.

The second step: site preparation

Waiting for shutdown: record all indicators before shutdown, and perform oil change operation after the equipment cools down.

Equipment case cleaning: Thoroughly clean the dust and oil stains of the equipment case to prevent contamination of new oil during the oil change process.

Environmental cleaning: clean the equipment site to ensure that the site is clean and free of oil pollution, which not only eliminates the potential safety hazards of slipping, but also prevents oil from being contaminated.

Demolition work

The third step: empty the old oil and gas tank oil

If there is compressed air at the scene, you can connect the compressed air to a valve in the intake pipe above the machine head. Use compressed air pressure to quickly drain and purge used oil from the system. Connect one end of the hose to the drain valve of the oil and gas tank and the other end to the waste oil barrel, open the valve, and empty the old oil from the oil and gas tank. In the case of ensuring safety, drain the oil as much as possible while warming up.

Step 4: Vent the oil cooler residual oil

When possible, open the cooler drain valve and connecting pipes in the state of heat engine. Prepare a container for receiving waste oil, and try to avoid environmental pollution caused by oil leakage.

Step 5: Empty the residual oil in the machine head and pipeline

Disassemble the drain plug of the main exhaust pipe, and naturally discharge old oil; for models without a sewage plug, remove the main exhaust pipe to drain the oil. Please manually crank the head or jog the motor to let the residual oil in the head be drained clean; repeat several times to confirm that no more oil is drained. Example: 200kW two-stage compressor machine head can release 20L of old oil.

Step 6: Remove the three filters

Remove the oil separator pipe, open the oil and gas separator, and take out the oil core. Remove the old oil filter. Replace the old air filter and clean the air filter.


Step 7: Clean the inner wall of the oil separator

If there are many oxides or rust on the inner wall of the oil separator, it is recommended to use a steel brush to clean it, or use a cleaning agent to clean it. But remember, if you use a cleaning agent to clean, you must clean the cleaning agent with water and use new oil to rinse. If the inner wall of the oil separator is relatively clean and free of oxides or rust, you only need to wipe off the residual oil on the inner wall. It is recommended to use the dough to stick it clean.

Reload work

Step 8: Reinstall all pipes and spare parts

Reinstall all pipes and tighten. Refill the oil filter. Before refilling, add a small amount of new oil to the oil filter to protect the new oil filter. Reinstall the new oil core. Reinstall the new air filter.

Add new oil job

Step 9: Add new oil

Use special refueling tools (pumps and pipelines) to refuel to avoid new oil pollution. After the oil and gas separation tank is full, confirm the operation and keep the oil level of the machine at the position shown in the figure. It is recommended to add some new oil to the machine head before starting the machine and manually crank it to ensure that the machine head screw is fully lubricated after the equipment is started.

Trial run

Step 10: Test run

Start the equipment, check the pipeline for leaks, if any, immediately stop the inspection and make repairs. Check whether all pipelines and spare parts are installed in place. It is recommended to use an inspection card to list each inspection item and check each item one by one. Half an hour after starting, record all operating parameters. If gelling occurs in the early stage, it is recommended to take an oil sample for 48 hours after running the flushing process.

to sum up

In the oil change work of air compressor, in order to ensure the work efficiency and maintenance quality, the following matters need to be noted: as far as possible, the old oil is discharged in the state of hot engine; it can prevent the precipitation of dissolved substances and maintain the fluidity of the old oil; all the parts in the system should Drain clean old oil; pay special attention to the oil discharge of the head car and the old oil discharge of the pipeline; use compressed air to clean up as much as possible, and use cleaning oil or working oil to manually clean the oil and gas tank if necessary; replace the oil filter, air filter, and oil separation core; If the system is seriously polluted, you can first add working oil to run for 24 hours before discharging, then repeat the above cleaning process and install new oil to put into operation.

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