Pressure relief grease zerks and drain plugs

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Has anyone on the forum used these pressure relief grease zerks and drain plugs. They were mentioned in an article that I read named "How to Design an Electric Motor Regreasing Program".

It was a fine article and it sounds like a good concept. I suppose you could still over pack the bearing even with a pressure relief, but it may be of some benefit. ??? I wouldn't know the appropriate pressure relief range for say, the 25-200 hp range of motors.

Here's links to the items of which I speak.

http://www.alemite.com/catalog/details.aspx?identifier=fittings_hydraulic

http://www.alemite.com/catalog/details.aspx?identifier=fittings_relief

Replies sorted oldest to newest

Registered Member

The motor shop I work for at times uses the relief fittings in all the motors with regreasable bearings. They use ones with a 1 to 5 lb. relief.

Dave

2/1/088:10 PM

Registered Member

We have used the relief fittings on motor and pump bearings. If pump bearings have defective lip seals the grease will come out of the lip seal of the housing if it is close to full before coming out of the relief fitting.

2/3/0811:57 AM

Registered Member

We have used them on draw works of drilling rigs, imagine a long shaft with cathead, air clutches hoisting drums and brakes.

Regards

2/22/081:29 PM

Registered Member

Overall, are they worth the change?

Do they perform as described below?

The pressure relief drain valve would eliminate the need to remove the drain plug and run the motor for 20 minutes. That's a nice labor savings if you could just start up and turn the equipment back over.

The pressure relief grease zerk would help eliminate the possibility of over-greasing the bearing, thereby reducing failures.

2/22/086:12 PM

Registered Member

I am interested in this topic, as well. Our factory has a number of applications where it is very difficult to get to the grease drain plug to remove with the equipment running. I would like to be able to grease these motors during the shift with Ultrasound. I was thinking that it may be a good idea to install these relief zerks in new greasable motors with no means of relief built into the design. We would only install these zerks in new motors or in motors that have been observed to discharge grease as grease is added.

Any suggestions are greatly appreciated.

10/17/1612:02 PM

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