Manual
6
For motors with provisions for relubrication, follow
intervals of the following table.
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.
Pulley and Belt Replacement
1. Remove pulleys from their respective shafts.
2. Clean the motor and fan shafts.
3. Clean bores of pulleys & coat the bores with heavy oil.
4. Remove grease, rust, or burrs from pulleys & shafts.
5. Remove burrs from shaft by sanding.
6. Place fan pulley on fan shaft and motor pulley on its
shaft. Damage to the pulleys can occur when
excessive force is used in placing the pulleys on their
respective shafts.
7. Tighten in place.
8. Install belts on pulleys and align as described in the
Belt and Pulley Installation section.
Bearing Replacement
1. Follow all local lock-out / tag-out procedures and
unwire the units motor.
2. Loosen the bolts supporting the motor plate and
remove the belt. Inspect the belt for signs of wear and
set aside.
3. Measure and record the distance of the wheel from
the housing side.
4. Using a putty knife at the wheel hub, scrape the resin
from the safety plate and retaining bolt.
5. Remove the retaining bolt and safety plate and set
aside.
6. Using either a jewelry screw driver or small drill bit,
remove the beeswax from the set screw openings and
set screw heads.
7. Remove the wheel and remove the old bearings and
shaft.
8. Install the new shaft to the wheel, safety plate, and
retaining bolt. Tighten all per the torque values as
stated on page 4.
9. Using a fiberglass resin repair kit, apply resin per the
manufacture instruction over the safety plate, and
retaining bolt. Recommend using a Grainger part
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
Lubrication - Fan Bearings
Greasable fan bearings are lubricated through a grease
fitting on the bearing.
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 burst
seals thus reducing bearing life.
Before lubricating, the grease nipple and immediate
vicinity should be thoroughly cleaned without the use of
high pressure equipment. The grease should be supplied
slowly as the bearing rotates until fresh grease slips past
the seal. Excessive pressure should be avoided to prevent
seal damage.
In the event the bearing cannot be seen, use no more
than three injections with a hand-operated grease gun.
NOTICE! Loren Cook Company uses petroleum
lubricant in a lithium base. Other types of grease
should not be used unless the bearings and lines have
been flushed clean. If another type of grease is used, it
should be a lithium-based grease conforming to NLGI
grade 2 consistency. A NLGI grade 2 grease is a light
viscosity, low-torque, rust-inhibiting lubricant that is
water resistant. Its temperature range is from -30F to
+200F and capable of intermittent highs of +250F. For
temperatures above 250°F Mobiltemp SHC 32 is
recommended.
Lubrication - Motor Bearings
Motors are provided with prelubricated bearings. Any
lubrication instructions shown on the motor nameplate
supersede instructions below.
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.
Exceptions to the greasing interval chart:
• Periodic Applications (any break of one week or
more): it is recommended that full lubrication be
performed prior to each break in operation.
• Higher Temperature: it is recommended to halve
the intervals for every 30F increase in operating
temperature above 120F not to exceed 230F
for standard bearings; High Temperature bear-
ings (optional) can operate up to 400F.
• Vertical Shaft: it is recommended that the inter-
vals should be halved.
Lubrication Conditions Chart
Fan Class Fan Status Shaft Size
Maximum Interval
(operational hrs)
Centrifugal
Blower
Class I
Normal Conditions
(Clean, Dry & Smooth)
> 1-1/2” 10,000
< 1-1/2” 2,000
Extreme Conditions
(Dirty/Wet/Rough)
> 1-1/2” 2,000
< 1-1/2” 400
Centrifugal
Blower
Class II
Normal Conditions
(Clean, Dry & Smooth)
> 2” 7,500
< 2” 1,000
Extreme Conditions
(Dirty/Wet/Rough)
> 2” 1,500
< 2” 200
Centrifugal
Blower
Class III
Normal Conditions
(Clean, Dry & Smooth)
> 2” 3,000
< 2” 500
Extreme Conditions
(Dirty/Wet/Rough)
> 2” 500
< 2” 100