4
SRSH IO&M
B51142-004
An NLGI #2 grease is a light viscosity, low-torque, rust-in-
hibiting 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 prelubricated in accordance with the fol
-
lowing conditions chart.
Conditions Chart
RPM
Temp °F
Greasing Interval
Up to 1000
-30 to 120
3 months
120 to 200
1 month
1000 to 3000
-30 to 120
6 weeks
120 to 200
2 weeks
Over 3000
-30 to 120
2 weeks
120 to 200
1 week
Any Speed
< -30
Consult Factory
Any Speed
> 200
1/2 week
For moist or otherwise contaminated installations, divide the interval
by a factor of three.
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 the
seal and reduce the 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.
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.
An NLGI grade 2 grease is a light viscosity, low-torque,
rust-inhibiting lubricant that is water resistant. Its tempera-
ture 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 lubri
-
cation instructions shown on the motor nameplate supersede
the following instructions.
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.
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 ap
-
plications, high temperatures or excessive contaminates, it is
advisable to have the maintenance department disassemble
and lubricate the bearings after three 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 &
Less
Over
1800
RPM
1800
RPM &
Less
Over
1800
RPM
1800
RPM &
Less
Over
1800
RPM
Standard
1-1/2 yrs.
3 mos.
1 yr.
3 mos.
6 mos.
6 wks.
Service
6 mos.
6 wks.
6 mos.
6 wks.
3 mos.
2 wks.
For units in severe conditions, lubrication intervals should be re
-
duced to half.
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.
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 fol
-
lowing:
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.
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.
Maximum RPM
SRSH
Size
Maximum
RPM
60-100
2125
120
1715
135
1620
150
1550
165
1325
180
1535
195
1370
210
1210
225
1060
245
900
270
765
