COOK FCRU - Manual (Page 4)

4
Inspection
Inspection of the fan should be conducted at the first 30
minute, 8 hour and 24 hour intervals of satisfactory
operation. During the inspections, stop the fan and inspect
as instructed.
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 Interva l:
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
contaminated air should be inspected every 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 4.
• 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.
Bearings should be relubricated in accordance with the
condition chart below.
For best results, lubricate the bearing while the fan is in
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.
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
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
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.
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 vertical
shaft installations.
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 ventilators (5HP or less) are equipped with
variable pitch pulleys. To change fan speed, perform the
following:
1. Loosen setscrew on driver (motor) pulley and remove
key, if equipped.
2. 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.
3. After adjustment, inspect for proper belt tension.
Maximum RPM (Refer to the catalog for max performance.)
Speed Reduction:
Open the pulley in order that the belt rides deeper in the
groove (smaller pitch diameter).
Speed Increase:
Close the pulley in order that the belt rides higher in the
groove (larger pitch diameter). Ensure that the RPM limits of
the fan and the horsepower limits of the motor are
maintained.
Size
Maximum RPM
Standard HP only
120 4500 4500
150 3600 4300
180 2900 3600
245 2200 2700
270 2000 2400
300 1800 2200
330 1650 2000
365 1500 1800
402 1350 1650
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