COOK CV - Manual (Page 5)

Troubleshooting
Problem and Potential Cause
Low Capacity or Pressure
•Incorrect direction of rotation. Make sure the fan rotates in same di-
rection as the arrows on the motor or belt drive assembly.
•Poor fan inlet conditions. There should be a straight clear duct at the
inlet.
•Improper wheel alignment.
Excessive Vibration and Noise
•Damaged or unbalanced wheel.
•Belts too loose; worn or oily belts.
•Speed too high.
•Incorrect direction of rotation. Make sure the fan rotates in same di-
rection as the arrows on the motor or belt drive assembly.
•Bearings need lubrication or replacement.
Overheated Motor
•Motor improperly wired.
•Incorrect direction of rotation. Make sure the fan rotates in same di-
rection as the arrows on the motor or belt drive assembly.
•Cooling air diverted or blocked.
•Improper inlet clearance.
•Incorrect fan RPMs.
Overheated Bearings
•Improper bearing lubrication
•Excessive belt tension.
5
a. Loosen setscrew on motor pulley.
b. Open or close the groove facing to change the pitch
diameter.
Speed Reduction - Open the pulley in order that the
belt rests deeper in the groove.
Speed Increase - Close the pulley in order that the belt
rests higher in the groove. Ensure RPM limits of the fan
and the horsepower limits of the motor are maintained.
c. Retighten pulley setscrew on one of the flat areas of
the motor shaft.
d. After the adjustment is made, check for proper belt
tension. See the Belt and Pulley Installation section.
Pulley and Belt Replacement
a. Remove pulleys from their respective shafts.
b. Clean the motor and fan shafts.
c. Clean bores of pulleys and coat the bores with heavy
oil.
d. Remove grease, rust, or burrs from the pulleys.
e. Remove burrs from shaft by sanding.
f. Place fan pulley on fan shaft and motor pulley on its
shaft.
Do not hammer the pulleys onto the shafts because
this may damage the bearings.
g. Tighten in place.
h. Install belts on pulleys and align as described in the
Belt and Pulley Installation section.
Bearing Replacement
The fan bearings are flange ball bearings.
a. Loosen the motor plate adjustment bolts, then slide
the motor plate so the belt will easily slip off.
b. Remove the driven pulley by loosening the setscrew.
c. Separate the outer housing halves.
d. Remove wheel, then loosen the setscrews on the hub
that holds the shaft and remove the hub plate. (Refer
to hub removal instructions below.)
e. Remove the bolts next to the straightening vanes and
pull the inner housing out.
f. Loosen the bearing setscrews and hold-down bolts,
then slide shaft out.
g. Sand the burrs on the shaft where the setscrews were
located.
h. Slide new bearings onto the shaft to the desired
location and loosely mount bearings onto the bearing
support. Bearing bolts and setscrews should be loose
enough to allow shaft positioning.
i. Replace the hub plate and wheel, align properly and
then tighten bearing hold-down bolts securely to the
bearing supports.
j. Align setscrews bearing to bearing and secure tightly to
the shaft.
Never tighten both pairs of setscrews before securing
bearing mounting bolts. This may damage the shaft.
k. Reassemble the unit.
l. Inspect the wheel position again. If necessary, readjust
by loosening the bearing bolts and setscrews and
repeat from step e.
Hub Removal
a. Drill two 1/4” diameter holes, 180
 apart centered
approximately between the shaft and the outside
diameter of the hub, 3/8” to 1/2” in depth.
b. Tap 1/4” holes to 5/16” thread with a 5/16” hole tap. Do
not drill or tap greater than recommended.
c. Screw the puller arms to the full depth of the threads
into the tapped holes. Align center of the puller with the
center of the shaft. Ensure all setscrews in the hub,
normally two, are fully removed.
d. Slowly remove wheel from the shaft.
Recommended Puller
Lisle No. 45000 Sterling Wheel Puller. This puller is
available at most automotive parts retail outlets.
Recommended Torque for Setscrews/Bolts (IN/LB.)
Setscrews
Hold Down Bolts
Size
Key Hex
Across
Flats
Recommended
Torque
Min. Max. Size
Wrench
Torque
No.10 3/32” 28 33 3/8”-16 240
1/4” 1/8” 66 80 1/2”-13 600
5/16” 5/32” 126 156 5/8”-11 1200
3/8” 3/16” 228 275 3/4”-10 2100
7/16” 7/32” 348 384 7/8”- 9 2040
1/2” 1/4” 504 600 1”- 8 3000
5/8” 5/16” 1104 1200 1-1/8” - 7 4200
3/4” 3/8” 1440 1800 1-1/4” - 7 6000