Bearing grease

37chief · May 31, 2017

Since my flail mower is no longer made I don't have a manual. The blade drum spins very fast. Have no idea how many RPM's. How many hours should these bearings be greased? Now, I grease the bearings every 6-8 hours. I know too much grease is not good either. Stan

Hotflashjr · May 31, 2017

What brand? Flails or hammers? We have an older Rears Pak-Flail with hard faced hammers and the old manual I have says to grease 2-4 pumps every 6 hours of use on the drum bearings. We have replaced the bearings in the past few years though and since then I have been doing only 2 pumps. Lots of rotating mass on this machine. Hammers are 4 inch with 3/4 inch bolts.

37chief · May 31, 2017

That's a heavy machine all right. My mower is a Dandal, and uses cutting blades, not hamers. Stan

4wdtom · May 31, 2017

Bearings will go a long time without new grease, look at wheel bearings in cars, electric motors, etc. If the bearing is in a clean area a shot of grease a year should be plenty. If it is getting dirt, dust, or water then much more often. Over greasing can be prevented by not pumping it full of grease, just adding a shot, or two if it is a large bearing. If you are trying to flush out the bearing by filling it until grease comes out you might blow out the seals. If it is full of grease and operates at high speeds you need to provide a bleed for the excess grease, removing the grease fitting for a while will help maybe. Running at a slow speed for a while might help.

donjr · May 31, 2017

Use true bearing grease in those older machines, not the newer relative bearing grease........

Bearing grease

37chief

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Hotflashjr

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37chief

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4wdtom

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donjr

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