COOK TCN - Manual (Page 7)

7
allow proper alignment. Care should be taken to insure
that inlet cone is centered inside wheel before and
after tightening attaching bolts.
n. Slide wheel on shaft to achieve proper wheel/inlet
overlap. Refer to Wheel-to-Inlet Clearance on page 3.
o. Replace and tighten belts.
p. Test run the fan.
q. Re-tighten setscrews on bearings, sheave, and
wheel. Recheck belt tension and adjust as needed.
r. Replace bearing cover.
s. Trim balance as necessary (.0785 in/sec max.).
Wheel Replacement for TCN & TCNH
TCN
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.
TCNH
The TCNH wheel has a pre-machined shoulder in the
hub for the use of most 2 and 3 jaw mechanical puller.
a. Align center of the puller with the center of the shaft.
b. Ensure all setscrews in the hub, normally two, are
fully removed.
c. Slowly remove wheel from the shaft.
After replacement trim balance as necessary (.0785 in/
sec max.).
Above - Drilled hole placement.
Right - Wheel puller.
c. Clean the motor and fan shafts.
d. Clean bores of pulleys and coat the bores with heavy
oil.
e. Remove grease, rust, or burrs from the pulleys and
shafts.
f. Remove burrs from shaft by sanding.
g. 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.
h. Tighten in place.
i. Install belts on pulleys and align as described in the
Belt and Pulley Installation section.
Bearing Replacement
The fan bearings are pillow block ball bearings.
a. Loosen and remove belts by lowering motor mounting
plate with the four adjusting nuts.
b. Remove the bearing cover by removing the four bolts
around the perimeter of the bearing cover. NOTICE!
Do not remove fan sheave yet.
c. Remove inlet cone by removing attaching bolts/nuts
around perimeter of the inlet plate.
d. Remove wheel by loosening setscrews and sliding off
shaft.
e. Record the location of the fan sheave from end of
shaft, and remove the sheave.
f. Record the distance from the bearing to the end of the
shaft.
g. Loosen setscrews on bearings and remove shaft.
h. Remove bearings and rubring and replace with new
bearings.
i. Slide shaft through bearings until shaft protrudes the
same amount as original shaft. Tighten setscrews.
j. Replace Rubring.
k. Replace fan sheave in original location.
l. Replace wheel but do not tighten yet.
m. Replace inlet cone. Wheel may need to be moved to
Maximum RPM
TCN-B
Size
Maximum RPM
TCNH-B
Size
Maximum
RPM
Non
Reinforced
Wheel
Reinforced
Wheel
60 3942 - 60 4100
70 3942 - 70 4100
80 3942 - 80 4100
100 3942 - 100 4100
120 3047 - 120 3757
135 2375 - 135 2950
150 2116 2269 150 2647
165 1766 2138 165 2412
180 1610 1850 180 2388
195 1429 1663 195 2198
210 1277 1435 210 1926
225 1152 1569 225 1773
245 1015 1530 245 1559
270 876 1287 270 1414
300 837 1072 300 1247
330 716 1026 330 1173
365 624 835 365 1025
402 539 707 402 925
445 463 684 445 842
490 630 582 490 762