4
FCE/FCRU IO&M
B51150-003
Bearings should be relubricated in accordance with the
condition chart below.
Conditions Chart
RPM
Temp. °F
Greasing Interval
Up to 1000
-30 to 120
6 months
120 to 200
2 months
1000 to 3000
-30 to 120
3 months
120 to 200
1 month
Over 3000
-30 to 120
1 month
120-200
2 weeks
Any Speed
< -30
Consult Factory
Any Speed
> 200
1 week
For moist or otherwise contaminated installations, divide the interval
by a factor of 3. For vertical shaft installation, divide the interval by a
factor of 2
For best results, lubricate the bearing while the fan is in
operation. Pump grease in slowly until a slight bead forms
around the bearing seals. Excessive grease can damage
seal and reduce life through excess contamination and/or
loss of lubricant.
In the event that the bearing cannot be seen, use no more
than three injections with a hand operated grease gun.
Motor Bearings
Motor bearings without provisions for relubrication will
operate up to 10 years under normal conditions with no
maintenance. In severe applications, high temperatures or
excessive contaminates, it is advisable to have the mainte-
nance department disassemble and lubricate the bearings
after 3 years of operation to prevent interruption of service.
For motors with provisions for relubrication, follow inter-
vals of the following table.
Relubrication Intervals
Service
Conditions
Nema Frame Size
Up to and
Including 184T
213T-365T
404T and Larger
1800
RPM
and
Less
Over
1800
RPM
1800
RPM
and
Less
Over
1800
RPM
1800 RPM
and Less
Over
1800
RPM
Standard
3 yrs. 6 months 2 yrs. 6 months
1 yr.
3 months
Severe
1 yr. 3 months 1 yr. 3 months 6 months
1 month
NOTICE! Motors are provided with a polyurea mineral
oil NGLI #2 grease. All additions to the motor
bearings are to be with a compatible grease such
as Exxon Mobil Polyrex EM and Chevron SRI.
The above intervals should be reduced to half for verti-
cal shaft installations.
Inspection
Inspection of the fan should be conducted at the first
30
minute
,
8 hour
and
24 hour
intervals of satisfactory op-
eration. During the inspections, stop the fan and inspect
as per the chart below.
30 Minute Interval
Inspect bolts, setscrews, and motor mounting bolts. Adjust
and tighten as necessary.
8 Hour Interval
Inspect belt alignment and tension. Adjust and tighten as
necessary.
24 Hour Interval
Inspect belt tension. Adjust and tighten as necessary.
Maintenance
Establish a schedule for inspecting all parts of the fan.
The frequency of inspection depends on the operating
conditions and location of the fan.
Inspect fans exhausting corrosive or contaminated air
within the first month of operation. Fans exhausting con
-
taminated air (airborne abrasives) should be inspected ev-
ery three months.
It is recommended the following inspections be
conducted twice per year:
• Inspect bolts and setscrews for tightness. Tighten as
necessary. Refer to
Torque chart
.
• Inspect belt wear and alignment. Replace worn belts
with new belts and adjust alignment as needed. Refer to
Belt and Pulley Installation
, page 5.
• Bearings should be inspected as recommended in the
Conditions Chart
.
• Inspect for cleanliness. Clean exterior surfaces only.
Removing dust and grease on motor housing assures
proper motor cooling.
Fan Bearings
NOTICE! The fan bearings are provided
prelubricated. Any specialized lubrication
instructions on fan labels supersedes information
provided herein. Bearing grease is a petroleum
lubricant in a lithium base conforming to a NLGI #2
consistency. If user desires to utilize another type
of lubricant, they take responsibility for flushing
bearings and lines, and maintaining a lubricant that
is compatible with the installation.
A NLGI #2 grease is a light viscosity, low-torque, rust-
inhibiting lubricant that is water resistant. Its temperature
range is from -30°F to 200°F and capable of intermittent
highs of 250°F.
