Re-greasing intervals

obanboyMember

I have a number of fan motors which require frequent regreasing. The DE roller bearing takes 50grammes every month and the NDE ball bearing takes 75grammes every three months.

Believing it was preferable to grease a smaller amount more frequently I set this up on a monthly route with 50grammes DE and 25grammes NDE. However we have now had a number of failures and I am starting to doubt that 25g per month = 75g per 3 months.

These are toshiba squirrel motors with grease relief ports.

Can anyone confirm this is good practice or otherwise.

7/19/158:49 PM

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renewaMember

At 50g per month or say 30days, it works out to about 1.7g per day. At 75g per 3 months or 90 days works out to 0.83g per day. This may be best case scenario where there is little moisture or contamination as more grease may be needed. What was the cause of failure on the NDE bearings? In Australia, Perma make the single point and auto lubricators which have been used on the low voltage squirrel cage induction motor bearings. The single point lubricators are the mechanical type where the amount of grease can be adjusted for delivery per day. The grease used ranges from a lithium to lithium complex, NLGI 2 or NLGI 3 and a base oil viscosity of around 100cSt. The NLGI 3 grease is stiffer than the NLGI 2 so used on vertical shafts and where there is higher vibration.

8/4/152:42 AM

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ryanfullMember

I have a question that sort of goes along with ObanBoys.

I was wondering if there is a very generic list of re-greasing intervals that is based on running temperature, bearing type and RPM for electric motors.

Any help would be appreciated!

8/5/158:21 AM

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