Coupling Grease

Have you taken a look at Mobil XTC coupling grease?

First do not just use a bearing grease in couplings because there are some specific requirements. One of the most important is that the thickener and additives do not separation under centrifugal forces. Get data or run ASTM D4425 high-speed centrifuge test on the greases. Also if the area is wet do water washout testing and corrosion tests. I would also run the Shell Roll Stability test because some thickeners soften considerably with working, heat and water. Plus, do some form of long term mechanical worked testing like 100,000 strokes D217 or the Shell Roll test. Most manufacturers now offer specific coupling greases as do some coupling suppliers. Do a Goggle search. I like the calcium sulphonate thickened ones because they do not require added EP additives and provide outstanding corrosion protection. Note; I do not sell coupling greases. See also AGMA CG-2 and CG-1 for their grease coupling specifications.

Mobilgrease XTC is the best and most recommended coupling grease in industry. Call 1-800-MOBIL-25 for your closest distributor.

The softer the grease the better in a coupling but unfortunatelly the sealing lets us down so I suggest that you change to a stiffer grade NLGI 2
In our Hot Strip Mill we use Castrol SBX 2 Grease

just try falk LTG (long term grease)its specialy designed from thickner doesnt allow for the thickner to separate from the base oil dute centrifugal forces at high speed coupling

Tran14,

Problem is centripetal acceleration which causes most greases to separate because the specific weight of the thickener differs from that of the base oils and additives.

You need a product designed so that all components have the same specific weight such as Albida GC1 and Alvania CG.

With these products we have achieved service intervals ranging from 6 months to 18 months depending on coupling speed. Some couplings running as fast as 3500 rpm on f.ex. Ahlstom turbines or bow tooth gear couplings in rolling mills running 800-1500 rpm.

Cheers,
GG

Hi, as far as the seals- we had a similar problem with the grease flinging out. Instead of dismounting the whole coupling, split the rubber seals and install, if you can super glue the ends, great! On some of the seals we couldnt glue, the seals worked better than no seals. Also, split the coupling face seals and install. Amaazing difference.....Kop-Flex is a good coupling grease but Im not sure about high temp? I worked in a steel mill years back as a mechanic and it seems Keystone was the grease of choice then. Brett

Some steel plants in India used Castrol HS Block Grease, the type you have mentioned. Soory no details available readily.

Hussam