What Causes Insufficient Transmission Pressure?
1 Answers
Here are the reasons for insufficient transmission pressure: 1. Insufficient hydraulic fluid in the transmission or the hydraulic fluid does not meet the specified standards. Generally, such transmissions must use the specified hydraulic fluid, such as No. 8 hydraulic transmission fluid or the manufacturer's designated hydraulic fluid. Ordinary hydraulic fluid is not allowed as a substitute. 2. The oil filter in the oil pan is clogged, resulting in insufficient hydraulic fluid flow. This filter is usually a metal mesh-type filter, and the most common issue is that the oil filter is not replaced for a long time, causing its surface to be clogged with various impurities, gum, metal debris, etc. 3. The oil pipe from the oil pan to the transmission pump is leaking air or has internal damage or delamination. Air leakage can cause the transmission pump to draw insufficient oil or fail to draw oil at all, while delamination can narrow the hydraulic fluid passage, both leading to insufficient hydraulic system pressure. 4. The transmission pump is damaged or excessively worn, resulting in insufficient pressure. Alternatively, the transmission pump drive mechanism (shaft gear) is damaged, preventing the transmission pump from rotating. The most common issue is excessive wear of the internal splines of the shaft gear, which prevents it from driving the transmission pump.
