6
IMH IO&M
B51221-002
8 Hour Interval
Inspect belt alignment and tension. Adjust and tighten
as necessary.
24 Hour Interval
Inspect belt tension on both blowers and energy wheel
drive belt. 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 should be inspect
-
ed every three months.
Regular inspections are recommended for fans exhaust-
ing non-contaminated air.
It is recommended the following inspection be
conducted twice per year.
•
Inspect bolts and setscrews for tightness. Tighten as neces
-
sary. Worn setscrews should be replaced immediately.
•
Inspect belt wear and alignment. Replace worn belts with
new belts and adjust alignment as needed. Refer to
Belt and
Pulley Installation
, page tk (3).
•
Bearings should be inspected as recommended in the
Con-
ditions Chart
.
• Inspect variable inlet vanes for freedom of operation and ex-
cessive wear. The vane position should agree with the posi
-
tion of the control arm. As the variable inlet vanes close, the
entering air should spin in the same direction as the wheel.
• Inspect springs and rubber isolators for deterioration and re-
place as needed.
•
Inspect for cleanliness. Clean exterior surfaces only. Remov
-
ing dust and grease on motor housing assures proper motor
cooling. Removing dirt from the wheel and housing prevent
imbalance and damage.
Lubrication - Fan Bearings
Greaseable fan bearings are lubricated through a
grease fitting on the bearing and should be lubricated by
the schedule,
Conditions Chart
.
Conditions Chart
Fan Class
Fan Status
Shaft Size
Max. Interval
(operational hrs)
Standard
Duty
Normal Conditions
(Clean, Dry & Smooth)
> 2"
7,500
< 2"
1,000
Extreme Conditions
(Dirty/Wet/Rough)
> 2"
1,500
< 2"
200
Heavy Duty
Normal Conditions
(Clean, Dry & Smooth)
> 2"
3,000
< 2"
500
Extreme Conditions
(Dirty/Wet/Rough)
> 2"
500
< 2"
100
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.
In the event the bearing cannot be seen, use no more
than three injections with a hand-operated grease gun.
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.
Exceptions to the greasing interval chart:
Periodic Applications (any break of one week of more)
It is recommended that the full lubrication be performed prior
to each break in operation.
Higher Temperature
It is recommended to halve the intervals for every 30°F in-
crease in operating temperature above 120°F not to exceed
230°F for standard bearings; High Temperature bearings (op-
tional) can operate up to 400°F.
Vertical Shaft
It is recommended that the intervals should be halved.
Loren Cook Company uses petroleum lubricant in a lithium
base. Other types of grease should not be used unless the bear
-
ings 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 -30°F to +200°F and capable of intermit-tent highs of
+250°F. For temperatures above 250°F, Mobiltemp SHC 32 is
recommended.
Lubrication - Motor Bearings
Motors are provided with prelubricated bearings. Any lu
-
brication instructions shown on the motor nameplate su-
persede 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 mainte-
nance department disassemble and lubricate the bearings
after 3 years of operation to prevent interruption of service.
For motors with provisions for relubrication, follow inter-
vals of the following table.
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 month
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 verti-
cal shaft installations.
Maximum RPM
Size Maximum RPM
SD*
HD**
70
3742
6236
90
2934
4889
110
2397
3994
130
2026
3377
150
1755
2924
170
1547
2579
Size Maximum RPM
SD*
HD**
190
1389
2315
210
1256
2093
230
1146
1910
260
1016
1693
290
908
1513
Unless otherwise noted, wheel construction for standard duty and
heavy duty is the same. *Standard duty. **Heavy duty.
Motor Services
Should the motor prove defective within a one-year pe-
riod, contact your local Loren Cook representative or your
nearest authorized electric motor service representative.
