I have some THK bearings/carriages. They are medium size and large size (4", 6" long). When I bought them they were covered with what looked like Cosmoline. It is a very thick gooey type stuff that is tan and opaque.
When I put the bearing on the rails to test them the carriages moved slowly because of the grease. So now I'm removing that grease.
Questions:
1. Is it possible I'm removing the kind of grease that is supposed to be on the bearings? (i.e. Not Cosmoline but bearing grease?)
2. What kind of grease do you use on your THK bearings?
3. How much grease is supposed to be in there?
4. It looks like there is a trough between the ball bearing races where grease can sit (Top part carriage between the races.) Is that space supposed to be filled with thick grease?
Any help appreciated.................Sam