Maintenance - COOK JetStream Installation, Operation And Maintenance Manual

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
(airborne abrasives) should be inspected every three months.
Clean the propeller and air inlets if material build-up is ex-
cessive. Excessive build-up can cause imbalance and failure
of the propeller. Always clean the entire propeller as partial
cleaning will cause imbalance and fan failure.
Regular inspections are recommended for fans exhausting
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 for cleanliness and clean as necessary. Removing
dust and grease on motor housing assures proper motor
cooling and proper air performance. Clean using com-
pressed air and/or dry rags. No liquid/solvent cleaners are
to be used.
• Inspect Inlet/outlet guards and the silencers. Remove any
build up or debris.
Motor Bearings
Motors are provided with prelubricated bearings. Any lubri-
cation instructions shown on the motor nameplate supersede
instructions below.
Motor bearings without provisions for relubrication will op-
erate up to 10 years under normal conditions with no mainte-
nance. In severe applications, high temperatures or excessive
contaminates, it is advisable to have the maintenance depart-
ment 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.
Relubrication Intervals
Up to and
including 184T
Service
1800
Conditions
Over
RPM
1800
and
RPM
less
Standard 3 yrs. 6 months
Severe 1 yr. 3 months
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.
Motor Replacement
1. Remove the propeller side silencer to gain access to the
motor.
2. Mark the location of the propeller in the housing.
JET STREAM I0&M
NEMA Frame Size
213T–365T 404T and larger
1800
Over 1800
RPM Over 1800
1800 RPM
and RPM
RPM and less
less
2 yrs. 6 months 1 yr. 3 months
1 yrs. 3 months 6 months 1 month
3. Remove the propeller retaining plate from the motor shaft.
4. Remove the propeller from the motor shaft.
5. Unhook the motor leads.
6. Remove motor from the motor mounting plate. Inspect all
hardware and replace worn components.
7. Attach the replacement motor to the motor mounting plate.
Tighten hold-down bolts to the proper torque.
8. See motor label for correct motor wiring.
9. Replace propeller on motor shaft in the location initially
marked in step 2.
10. Check for proper rotation. To reverse, see previous wiring
diagrams.
11. Replace the retaining plate and propeller side silencer that
was initially removed to gain access to the motor.
After 24 hours of continuous operation, tighten the set-
screws to the appropriate torque. This assures the full locking
of the inner race to the shaft. Ensure the socket key or driver
is in good condition with no rounded corners. The key should
be fully engaged in the setscrew and held squarely to prevent
the rounding out of the setscrew socket when applying maxi-
mum torque.
Motor Replacement Precautions
• If the shaft is dropped and bent, it may cause unbalanced
operation of the fan
• When handling the propeller separately from the shaft,
place a support through the hub for lifting, making sure not
to injure the finished bore of the propeller
• Never allow the propeller to rest its entire weight on the
blades. The propeller and shaft can be lifted by slings
around the shaft on each side of the propeller so the propel-
ler is supported by its hub
• If using a chain to lift the propeller, make sure there is suf-
ficient padding on the shaft and propeller. This pre-vents the
scoring of the shaft or injury to the propeller. The chain or
cable should be spread with timbers, or braced by some
other method to prevent damage to the propeller side plates
4 P0000313-000