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Motors
Motor maintenance is generally limited to cleaning and lubrication. Cleaning
should be limited to exterior surfaces only. Removing dust and grease
buildup on the motor housing assists proper motor cooling. Never wash-
down motor with high pressure spray. Greasing of motors is only intended
when fittings are provided. Many fractional motors are permanently
lubricated for life and require no further lubrication. Motors supplied with
grease fittings should be greased in accordance with the manufacturer's
recommendations. When motor temperature does not exceed 104°F (40°C),
the grease should be replaced after 2000 hours of running time.
Wheel & Fasteners
Wheels require very little attention when moving clean air. Occasionally oil and dust may accumulate on the
wheel causing imbalance. When this occurs the wheel and housing should be cleaned to ensure smooth and
safe operation. Inspect fan impeller and housing for fatigue, corrosion or wear.
Routinely check all fasteners, set screws and locking collars on the fan, bearings, drive, motor base and
accessories for tightness. A proper maintenance program will help preserve the performance and reliability
designed into the fan.
Bearings
Shaft bearings are the most critical
moving part of a fan. Therefore,
special attention should be given to
keeping the bearings clean and well
lubricated. Proper lubrication
provides for reduction in friction and
wear, transmission and dissipation
of heat, extended bearing life and
prevention of rust.
In order for a lubricant to fulfill these
tasks, the proper grease applied at
regular intervals is required. See the
recommended bearing lubrication
schedule. If unusual conditions
exist, such as temperatures below
32°F, temperatures above 200°F,
moisture, or contaminants - more
frequent lubrication is required.
With the unit off, add grease very
slowly with a manual grease gun
until a slight bead of grease forms at the seal. Be careful not to
unseat the seal by over lubricating or using excessive pressure. A
guide to the amount of grease to be used is to fill 30% to 60% of
available space in the bearing and housing. Never mix greases
made with different bases. This will cause a breakdown of the
grease and possible failure of the bearing.
In addition to lubricating the bearings at specified intervals, set
screws in the bearing collars should be checked for tightness. A
bearing collar which has loosened will cause premature failure of
the fan shaft. Fasteners attaching the bearings to the drive frame
should also be checked.
* Suggested initial greasing interval is based on 12 hour per day operation. For continuous (24 hour)
operation, decrease greasing interval by 50%.
- For ball bearings, add 1-2 shots of grease up to 2 inch bore sizes, and 4-5 shots of grease above 2 inch
bore sizes with hand grease gun.
- For roller bearings, relubricate with 4 shots of grease up to 2 inch bore size and 8 shots for 2-5 inch
bore size.
- Adjust lubrication frequency based on condition of purged grease.
- A high quality lithium base grease conforming to NLGI Grade 2 consistency, such as those listed below,
should be used.
MOBILITH SHC 220 TEXACO MULTIFAK AFB2 SHELL ALVANIA #2
MOBILITH AW2 TEXACO PREMIUM RB EXXON UNIREX N2
WARNING: Lubricate bearings prior to periods of extended shutdowns or storage and rotate shaft monthly to
aid in preventing corrosion. If the fan is stored more than three months, the bearings should be
purged with new grease prior to start-up.
Recommended Bearing Lubrication Schedule for APEX Fans
Relubrication Schedule in Months*
Bearing Bore (inches)
Fan
1
⁄
2-1 1
1
⁄
8-1
1
⁄
2 1
5
⁄
8-1
7
⁄
8 1
15
⁄
16 -2
7
⁄
16 -3
3
⁄
16 -3
15
⁄
16-4
15
⁄
16 -
RPM
2
3
⁄
16 33
1
⁄
2 4
1
⁄
2 5
1
⁄
2
750 6 5 4 3 3 2 2 1
1000 6 4 3 2 2 1 1 0.5
1250 5 3 2 1 1 0.5 0.5 0.25
1500 5 2 1 1 0.5 0.5 0.25 0.25
Routine Maintenance
®