1. Slide flange side of bushing (Item #4) on fan shaft until end of taper is flush with end of fan shaft. This is the minimum allowable contact between bushing and fan shaft. NOTE: If the bushing does not slide easily onto the shaft, it may be slightly spread by tapping a screwdriver into the split at the large end. Do not use a chisel and do not put screwdriver on tapered surface or bushing will be damaged. Be sure the bushing key way and fan shaft key way are aligned. Insert the key into the keyway and gently tap the full length into the bushing. Tighten bushing set screw to hold bushing in place. Bushing bolts and hub bolt heads (Item #3) will then face the intake side of fan assembly. NOTE: The hub can be mounted in either direction. If desired, bushing can be installed to face the air discharge side of fan by placing the fan hub on shaft first, then position the split-tapered bushing (Item #4) on the shaft and inside the hub.

2. Lift or pull the hub (item #2) onto the taper of the bushing (Item #4) making sure the bolt holes in the bushing flange align with the threaded holes in the hub and bushing is at least flush with face of shaft.

3. Insert bushing bolts with split lock washers (Item #5) into holes and tighten each to finger tightness Qnly. Using a torque wrench, tighten the bolts in rotation: 3/8" bolts to 35 ft. lbs. Be particularly careful to tighten the bolts in a rotating pattern and in accordance with correct torque wrench use. DO NOT USE ANY FORM OF LUBRICANT OR ANTI SEIZE ON THREADED JOINTS OR BUSHING.

4. INSTALLING THE BLADES. Remove 1 spacer ring from blade shank and set aside in a safe place. If required, it will be used later during final adjustment of tip clearance. Place a pair of match marked clamps (Item #7) around the shank of the blade (Item #1) and slide the clamp and blade into the hub. Be sure to position one side of the clamp to line up with one bolt hole and insert a bolt (Item #3). Once the first bolt is pushed through the other side of the hub and a nut is tightened to finger tightness, pull the blade to proper position to line up the corresponding bolt holes. Insert the other bolts completely through the hub and tighten to finger tightness only.

5. Rotate the fan blade a complete revolution checking the installed blade for tip clearance at the fan ring. If required, insert or remove spacer rings to yield tip clearance of one half of one percent of the fan nominal diameter, not to exceed 3/4", with a minimum of 3/8". To minimize tip clearance, be sure the blade has been pulled completely to the face of the blade clamp. If there is interference between blade and fan ring, insert a spacer between blade shank end flange and blade clamp. NOTE: The fan is designed and dimensionally built to use 2 spacer rings. Once desired tip clearance is confirmed, repeat the above steps for all additional blades. Remember not to tighten the bolts and nuts beyond finger tightness. Once all the blades have been installed, check tip clearance by rotating the fan.

6. All blades for an API fan or odd bladed non API fan are marked with the same letter of the alphabet indicating they are a matched set and can be installed at any location on a common hub. Blades for a even bladed non API fan are marked as pairs and should be installed opposite each other (A across from A, B across from B,...) on a fan hub.

7. SETTING THE BLADE ANGLE: Place the protractor at position indicated by the label on fan blade. Tap the blade shank with a rubber mallet until desired blade angle is achieved. Using a torque wrench, tighten the 1/2" bolts in rotation to 55 ft. lbs. For vertical fans, rotate blade to 3:00 position to set blade angle. For horizontal fans, installer can select any convenient position. In either case, all blade angles must be set with the protractor at the same location on each blade and with all blades rotated to the same position in the fan ring. Be particularly careful to tighten the bolts in a rotating pattern and in accordance with correct torque wrench use. DO NOT USE ANY FORM OF LUBRICANT OR ANTI SEIZE ON THREADED JOINTS OR BUSHING.

8. After installing all blades, mark the fan ring at any blade leading (or trailing) edge. Slowly rotate fan to confirm all blades "track" to the mark on the fan ring within the greater of +/- 1/4" or +/- .25% of fan diameter. If not, loosen the clamp bolts and manually adjust blades(s) until tracking is within tolerance.

AFTER INSTALLATION CHECKS: EXTREMELY IMPORTANT!! Check electric Amp draw/voltage rate immediately after start up. After one hour, re-check the blade angle and re-torque all blade bolts/nuts.

MAINTENANCE Properly installed, your Amarillo Chittom AirFlo Manually Pitched Fan requires little maintenance. However, all bolts and nuts should be checked occasionally to ensure tightness. At the same time, inspect blades for any nicks or cracks. For best performance and best air-moving efficiency, blades should be kept clean.