What was applied was yellow grease, but when it was disassembled and inspected, it turned black and became muddy.
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In the spiral bevel gear transmission, yellow grease was applied, which was in the form of a relatively hard paste. When the grease was disassembled and inspected, the grease turned black and turned into a sludge. The gears were worn and burned red. The bearing cage was damaged and the rolling elements fell off. After inspection, the same situation happened a month later. I disassembled it again and inspected it. I don’t know why.
Something has dissolved or diluted the butter, causing poor lubrication and burning the bearings.
It looks like it's oxidized. Is it ordinary grease? Try using high temperature to see.
It says -20~120℃ on the outside of the barrel. Isn’t this temperature range enough?
It's oxidized. Is the lubricant defective?
It's not the grease recommended by the equipment manufacturer. I feel like the grease doesn't have a lubricating effect.
Does the laboratory need to analyze various indicators after purchasing grease or lubricating oil? Does your factory buy it and add it directly to the equipment, or does it need to be tested and analyzed first?
Is the gear mesh clearance adjusted correctly? Is it low-speed rotation or high-speed transmission? Hyperbolic gear oil 46 can be used#
Does grease become liquid when it is oxidized?
High temperature and grease did not dissipate the heat