MK Plastics KVC IO&M - Manual (Page 2)

M.K.Plastics Corp. Montréal, Québec www.mkplastics.com 2
Fan Installation, Factory Assembled Units
Follow proper handling instructions as given earlier.
1. Move the fan to the final mounting position.
2. Remove skid, crates and packing materials carefully.
3. Attach vibration isolators (if used) to appropriate mounting clips on fan. Locate fan in position
using lifting instructions above.
4. Carefully level unit using shims (on rigid mounted fans) at mounting hole locations. Fans mounted
with vibration isolators may be leveled by adjusting the hardware.
5. Continue with Operations Checklist.
Motor Maintenance
The three basic rules of motor maintenance are:
1. Keep the motor clean.
2. Keep the motor dry.
3. Keep the motor properly lubricated.
Blow dust off periodically (with low pressure air) to prevent motor from overheating. Some smaller motors
are lubricated for life. Lubrication requirements are normally attached to the motor. Use the motor
manufacturer’s recommendations for relubrication. If this information is not available, the following
schedule maybe used. Motors less than 10 HP running about eight hours a day in a clean environment
should be lubricated once every five years; motors 15 to 40 HP, every three years. For motors in dusty or
dirty environments or running 24 hours a day: divide the service interval by 4. Do not over lubricate.
Drive Maintenance and Installation
V-belt drives need periodic inspection, retensioning, and occasional belt replacement. When inspecting
drives, look for dirt buildup, burrs or obstructions that can cause premature belt or drive replacement. If
burrs are found, use fine emery cloth or a stone to remove them. Be careful that dust does not enter the
bearings.
Check sheaves for wear. Excessive slippage of belts on sheaves can cause wear and vibration. Replace
worn sheaves with new ones. Carefully align sheaves to avoid premature sheave failure.
Inspect the belts for wear. If fraying or other wear is observed to be mostly on one side of the belts, the
drives may be misaligned. Reinstall the drives according to the following instructions:
1. Slip (do not pound) proper sheave onto corresponding shaft. CAUTION: Placing fan sheave on
motor can over-speed wheel and cause structural failure.
2. Align sheaves with straight edge extended along sheaves, just making contact in two places on
outside perimeters of both sheaves.
3. Tighten sheave bolts (or setscrews if appropriate). Table1 can be used to determine the amount
of torque required.
4. Install a matched set of belts. Adjust the motor position to obtain slack, install, and tighten belts.
Using a pry bar will damage belts.
5. Tighten belts to proper belt tension. Ideal tension is just enough so that the belts do not slip under
peak load. When using drive tensioning data supplied by V-belt drive manufacturers, new belts
can be tensioned to a value 50% greater than for normal operation. This will reduce retensioning
requirements after break-in. Recheck sheave alignment after tensioning.
6. After initial installation of belts, recheck belt tension again after a few days. (New belts require a
break-in period of operation.)
7. When replacing belts, replace the entire set. After initial replacement and tensioning, recheck belt
tension after a few days. (New belts require a break-in period of operation.) Never use belt
dressing on any belts.
8. Fans that have motors and drives mounted at the factory are trim balanced prior to shipment.
This is not possible on units that are shipped without motors and drives. The addition of drive
components in the field can create unbalance forces. MK Plastics recommends final balancing of
the unit after the drive components are installed. Failure to do so may void the warranty.