How to Change Transmission Oil with a Flushing Machine?
4 Answers
Methods for changing transmission oil with a flushing machine: 1. The first method is similar to changing engine oil, where the transmission's drain plug is unscrewed to drain and refill the oil. 2. The second method involves directly removing the oil pan to drain and refill the oil. 3. The third method is currently more advanced, using a flushing machine to change automatic transmission oil. The first two methods are widely used today because they are cost-effective (requiring less oil) and do not require repair shops to purchase additional equipment. However, there are drawbacks: traditional gravity oil change methods cannot "completely" replace the transmission oil, while using a flushing machine to change automatic transmission oil effectively addresses this shortcoming.
I've personally done the transmission fluid change using a flushing machine several times. The whole process is quite straightforward: First, drive the car to normal operating temperature, letting the engine warm up for about 15 minutes to thin out the old fluid for better flow. Then pop the hood and locate the two hoses connecting the transmission to the radiator - typically one is the inlet line and the other the return line. After disconnecting the original connections, attach the flushing machine's input hose to the transmission's inlet port and the output hose to the return port direction. Start the machine, and it will automatically pump in new fluid while pushing out the old fluid into a waste oil container. Monitor the waste fluid's color change - when it transitions from murky black to relatively clear, you're nearly done. The entire process takes about 20-30 minutes, ensuring over 90% of old fluid residues and debris are thoroughly flushed out. This method is far superior to just draining through the plug, making the transmission operate smoother and last longer. After completion, reconnect the hoses properly, don't forget to check the fluid level, and take a test drive to verify smooth gear shifts.
As someone who frequently helps friends with oil changes, I've found that the flush machine is the preferred method for replacing transmission fluid. During operation, warm up the engine to operating temperature, with the transmission fluid temperature around 80°C. To connect the flush machine, accurately locate the transmission cooler line connections, disconnect the lines, and install adapter hoses. Once the machine is started, it injects new fluid at constant pressure while expelling the old fluid into a waste container, continuously monitoring the color of the outgoing fluid until it runs clear and free of contaminants. This technique removes nearly all the old fluid, preventing internal blockages and extending service life. I recommend wearing gloves and protective clothing to avoid oil stains during the job, and checking for any leaks afterward, which is key to ensuring safety and efficiency.
The steps for changing transmission fluid with a circulation machine are straightforward. Warm up the car for a few minutes, then locate the radiator hose connection. After attaching the circulation machine hoses, start the equipment to pump in new fluid while the old fluid is expelled. Stop the process when the fluid color changes from murky to clear. Finally, check that the fluid level is normal. This method provides deeper cleaning and improves shifting performance.
