COOK KSP - Manual (Page 6)

6
individually for each side of fan.
An emery cloth or file may be needed to remove imper-
fections in the shaft left by the setscrews.
a. Remove topcap.
b. Loosen motor plate adjustment bolts, then move the
motor plate so the belt will easily slip off. Remove
driven pulley by loosening the setscrews.
c. Remove the bearings from shaft.
d. Slide new bearings onto shaft to desired location and
mount bearings loosely onto support base. Bearing
bolts and setscrews should be loose to allow shaft
positioning.
e. Position the wheel properly and tighten the bearing
bolts securely to the support base.
f. Align setscrews bearing to bearing and tighten against
the shaft securely.
Never tighten both pairs of setscrews before
securing bearing mounting bolts. This may dam-
age the shaft.
g. Check wheel position again. If necessary, readjust by
loosening the bearing bolts and setscrew and repeat
step e.
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.
•Fan surge.
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.
•Incorrect voltage.
Overheated Bearings
•Improper bearing lubrication
•Excessive belt tension.
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 representa-
tive.
Changing Shaft Speed
All belt driven fans with motors up to and including 5 HP
are equipped with variable pitch pulleys. To change the fan
speed, perform the following:
a. Loosen setscrew on driver (motor) pulley and remove
key, if equipped.
b. 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.
c. 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.
Replacing Pulleys and Belts
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 and
shafts.
e. Remove burrs from shaft by sanding.
f. Place fan pulley on fan shaft and motor pulley on its
shaft. Damage to the pulleys can occur when exces-
sive force is used in placing the pulleys on their
respective shafts.
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 for the 200 ASP, ASP-T and KSP are
pillow block ball bearings. Bearings should be replaced
Maximum RPM
ASP/ASP-T
Size
Maximum
RPM
KSP
Size Maximum
RPM
90 1665 90 1672
100 1519 100 1534
120 1223 120 1297
150 1075 150 1052
180 978 180 979
200 844 200 835