COOK Propeller Wall Fans - Manual (Page 5)

5
The above intervals should be reduced to half for vertical
shaft installations.
Fan Bearings
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.
Bearings should be relubricated in accordance with the
condition chart below.
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.
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 to 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
installations divide the interval by a factor of 2.
Motor Services
Should the motor prove defective within a one-year
period, contact your local Loren Cook representative
or your nearest authorized electric motor service
representative.
Changing Shaft Speed
All belt driven Propeller Wall fans with motors up to and
including 5HP are equipped with variable pitch pulleys. To
change the fan speed, perform the following:
a. Loosen setscrew on driver (motor) pulley and remove
key, if equipped.
b. Turn the pulley rim to open or close the groove facing.
If the pulley has multiple grooves, all must be adjusted to
the same width.
c. After adjustment, inspect for proper belt tension.
Speed Reduction
Open the pulley in order that the belt rides deeper in the
groove (smaller pitch diameter).
• Inspect belt wear and alignment. Replace worn belts
with new belts and adjust alignment as needed. See Belt
and Pulley Installation, on page 2.
• Bearings should be inspected as recommended in the
Conditions Chart, below.
• Inspect for cleanliness. Clean exterior surfaces only.
Removing dust and grease on motor housing assures
proper motor cooling.
Lubricants
Loren Cook Company uses petroleum lubricant in a
lithium base conforming to NLGI grade 2 consistency.
Other grades of grease should not be used unless the
bearings and lines have been flushed clean. If another
grade of grease is used, it should be lithium-based.
A NLGI grade 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.
Motor Bearings
Motors are provided with prelubricated bearings. Any
lubrication instructions shown on the motor nameplate
supersede instructions below.
Direct Drive 1050/1075,1200,1300 &1500 rpm units use
a prelubricated sleeve bearing that has a oil saturated
wicking material surrounding it. The initial factory
lubrication is adequate for up to 10 years of operation
under normal conditions. However, it is advisable to add
lubricant after 3 years. Use only LIGHT grade mineral oil
or SAE 10W oil up to 30 drops. If the unit has been stored
for a year or more it is advisable to lubricate as directed
above. For units in severe conditions, lubrication intervals
should be reduced to half.
Motors without sleeve bearings (as described above)
will have grease lubricated ball or roller 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 maintenance
department disassemble and lubricate the bearings after 3
years of operation to prevent interruption of service.
For motors with provisions for relubrication, follow
intervals of the table below.
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
months
Motors are provided with a polyurea mineral oil NGLI #2
grease. All additions to the motor bearings are to be with a
compatable grease such as Exxon Mobil Polyrex EM and
Chevron SRI.