Flowserve SMB Series Electric Actuators - Manual (Page 36)

SMB Series/SB Series Installation and Maintenance FCD LMENIM1401-04-AQ – 01/15
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6.2 Major Maintenance
NOTE: Major maintenance is required when an operational deficiency is evident. The deficiency
should be thoroughly evaluated to determine the extent to which major maintenance should proceed.
Major maintenance consists of the following:
1. Perform all routine maintenance checks. See Section 6.1, Routine Maintenance.
2. Disassemble deficient portion of equipment.
3. Replace damaged or excessively worn components with new factory parts.
NOTE: Replace the Worm and Worm Gear as a set to ensure the greatest benefit from replacement.
Replace the entire limit switch gear box rather than attempt repairs in the field.
4. Replace all torn gaskets and seals.
5. Inspect stem and stem nut threads carefully for wear and/or damage.
6. Verify all electrical control components are operating before reinstallation.
6.3 Lubrication
Proper lubrication is essential to achieve the actuator design life. The actuator has been designed to
minimize maintenance and relubrication requirements. However, periodic inspection is a necessity.
The SMB and SB actuators have a totally sealed gear case, factory-lubricated with grease. The
gear case can be mounted in any position. However, those mounting positions that would result in
the actuator motor being saturated with lubricant if the seal failed should be avoided and are not
recommended.
No seal can remain absolutely tight at all times. Therefore, it is not unusual to find a small amount
of weeping around shaft seals—especially during long periods of idleness such as storage. Grease
lubrication minimizes this condition as much as possible. If a small amount is weeping at start-up,
remove it with a clean cloth. Once the equipment is operating on a regular basis, the weeping
should stop. Lubricant weeping is normal when there is infrequent operation and does not affect
the functionality of the actuator. Weeping is not covered by the standard warranty.
6.3.1 Lubrication Inspection
Inspect Limitorque SMB and SB actuators for correct lubrication prior to operating—particularly
following a long storage period.
Each application has its own effect on the actuator and the frequency of these inspections should be
based on the application and the operating experience. The following lubrication inspection schedule
is recommended until operating experience indicates otherwise.