AmTecs larger range of motor have an open style bearing so re-greasing via the grease port can be required at certain intervals. 

The following process is a good procedure for re-greasing

• Clean the areas around the fill and drain fittings to ensure contaminants are not introduced into the bearing cavity.
• Remove the drain fitting.
• Leave the draining plug out for the duration of the re-greasing process.
• With the motor running at operating temperature, add the recommended quantity of grease, or add slowly until it begins to move into the relief tube.
• After excessive grease has been purged, the drain plug should be re-installed and the excessive grease cleaned from the drain area.

Re-greasing interval is only a guide line and can vary depending on the load characteristic of the application and environmental conditions. The following note can help maintain bearing life outside of the above recommendations.

Motor noise and vibration should be monitored upon installation to establish a baseline.  At regular intervals, these measurements should be checked and any sudden or significant change considered reason to check bearing lubrication. Motor bearing temperature is also a valuable analysis tool and should be monitored and trended over time. An increasing trend could be an indicator of the need to renew the grease or that the bearings are over-greased. Finally, attention should be paid to any high frequency noise output or vibration level as they may be a sign of bearing lubrication trouble.

Frame	Quantity	Grease Replenishing interval (hours)
	(grams)	3600 rpm	3000 rpm	1800 rpm	1500 rpm	1200 rpm	1000 rpm	900 rpm	750 rpm
160-180	20	2800	3400	6100	6800	7900	8700	9200	10100
200-225	25	2400	3000	5200	6000	7200	8000	8400	9000
250-280	40	1600	1900	4300	5000	6200	7000	7500	8400
315	50	1100	1300	3800	4600	5700	6500	7000	7800
355	60	1100	1300	3800	4600	5700	6500	7000	7800
Grease type: Esso Mobil UNIREX N2