SECTION 11: MAINTENANCE SCHEDULE
Type of Maintenance
Month to be Serviced
1st 2nd 3rd 4th 5th 6th 7th 8th 9th 10th 11th 12th
1. Lubricate Motor
CHECK MOTOR MANUFACTURERS
RECOMMENDATIONS
2. Check Motor Amp Draw
3. Lubricate Aerator
4. Inspect Coupling
5. Tighten Bolts
6. Inspect Propeller
7. Inspect Seals
1.
Lubricate Motor:
See motor manual for correct grease. (Note: Many motors for Class I
TORNADO aerators are permanently sealed and do not require lubrication.)
2.
Check Motor Amp Draw:
Tested amp draw should or -5% from name plate full
load amp draw.
3.
Lubricate Aerator:
Lubricate aerator grease fittings as listed or after any shutdown period
of 30 days or more. Two shots of Lubrimatic/Witco Corporation N11402 marine corrosion
control grease should be used. Use of other grease may void warranty, as mixing greases
can destroy their properties.
4.
Inspect Coupling:
Check for wear or presence of rubber dust at the coupling area.
Realign or replace flexible sleeve as needed (
see Appendix C
).
5.
Tighten Bolts:
Tighten all exposed bolts.
6.
Inspect Propeller:
Check for nicks or pits on the propeller and repair/replace as needed.
With the propeller firmly in hand, check for both end play and side play.
7.
Inspect Seals:
Rotate propeller by hand. Propeller should rotate freely. Remove the
propeller and cone, then visually inspect the outer seal. There should not be a gap between
the seal and shaft. Pull on shaft to check for end play. There should not be noticeable end
play. An aerator with end play, a gap between the seals and shaft or shaft rotation that is
loose and grinding, should be further inspected. Further inspection requires removal of the
seal module and visually checking the bearings. Kits are available from AEROMIX for
replacing seal modules or bearings. AEROMIX recommends that seals and bearings be
inspected more than twice a year on aerators that are used in high grit wastewater or
petrochemical wastewater, and replaced as necessary.
NOTE:
Some applications may require more frequent seal inspection.
Special Notes:
When an aerator is shut down for more than two weeks, the unit should be
tipped out of the water to prevent plant and debris build up inside the draft tube and around the
aerator. In lagoons with a high amount of floating rags or plastic, the aerator propeller should
be checked for fouling on a regular basis.
Maintenance of Float-Mounted Aerators Under Tropical Salt Water Conditions:
Salt
water immersion of stainless steel floats requires special maintenance. Yearly cleaning and
refinishing in dry dock conditions are required. Replace floats and straps as needed during each
haul out or at most every three years. Monthly greasing of lower unit bearings may be required.
Extreme heat may require motor bearings to be greased every 6 months with manufacturers
recommended grease. Local marine growth, barnacles and electrolysis to be repaired as needed.
-16-
Aeromix Class 1 Tornado Aspirating Aerator - Installation Operation Maintenance - Vendor Manual
Q-Pulse Id: VM483
Active: 11/11/2015
Page 27 of 30