COOK H-Series - Manual (Page 5)

5
In the event that the bearing cannot be seen, use no more
than three injections with a hand operated grease gun.
Motor Bearings
Motors are provided with prelubricated bearings. Any lubri-
cation 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 ade-
quate 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 VCR direct drive units and
other 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 appli-
cations, high temperatures or excessive contaminates, it is
advisable to have the maintenance department disassemble
and lubricate the bearings after 3 years of operation to pre-
vent interruption of service.
For motors with provisions for relubrication, follow intervals
of the table below.
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.
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.
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
Filters
Filter inspection and cleaning intervals can vary from
once a week to twice per year depending on contaminant
present and acceptable pressure drops across the filter.
Under most conditions filters may be cleaned with hot
water and a mild soap solution (such as dish washing liq-
uid) or steam. Some caustic cleaners will damage the filter.
If in doubt, please consult the factory for a compatibility list.
High pressure spray washers should be limited to
2,000psi operating pressure. Every attempt should be
made to remove the contaminants from the filter in a “back-
wash” flow (note airflow arrow on the filter frame). Once the
filter is dry, it may be returned to the appropriate filter racks
in the same orientation (airflow direction) as they were
removed.
Maintenance
Establish a schedule for inspecting all parts of the fan.
The frequency of inspection depends on the operating con-
ditions 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
every three months. Clean the propeller and air inlets if
material build-up is excessive. Excessive build-up can
cause imbalance and failure of the propeller.
Regular inspections are recommended for fans exhaust-
ing non-contaminated air.
It is recommended the following inspections be con-
ducted twice per year.
• Inspect bolts and setscrews for tightness. Tighten as
necessary.
• Inspect belt wear and alignment. Replace worn belts
with new belts and adjust alignment as needed. See
Belt and Pulley Installation.
• 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
The fan bearings are provided prelubricated. Any spe-
cialized lubrication instructions on fan labels supersedes
information provided herein. Bearing grease is a petroleum
lubricant in a lithium base conforming to a NLGI #2 consis-
tency. 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 installa-
tion.
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.
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
Any Speed > 200 1 week