When the oil level of the bearing chamber is low, the oil in the oil cup is automatically added to the bearing chamber, which is very convenient for daily maintenance, but the improper use of the oil cup often causes inexplicable drip phenomenon, the oil in the oil cup will soon leak light, and the ground will also appear a puddle of oil.
Analyze the cause of the oil cup leakage, we first understand the basic principle of the oil cup work, there is a bevel shaped pipe below the oil cup, the bearing chamber level is lower than the bevel, the air will enter the oil cup, the oil cup will appear bubbling phenomenon, the oil will be added to the bearing chamber, the bevel sealed in the oil, the air will not enter the oil cup, the oil cup level remains unchanged.
There are two main reasons for leakage, one is that the oil level of the bearing chamber is too high, the high bearing temperature of the pump will heat the air during operation, and the expanded air will drive the oil out, and the other is that the transparent oil cup and the cup holder have a bad seal. Sometimes the sealing pad contains sand particles, which will affect the tight seal, and the oil cup and the cup holder are not tightened.
The correct refueling procedure for KSB pump is shown in the above picture taken from the maintenance manual.