MAINTENANCE
1. DANGER!
Before performing any maintenance on the fan, be sure power is turned off and locked in the
OFF
position at the service entrance before servicing the fan.
2.
Ventilators should be carefully checked at least once a year. For critical or rugged applications, a routine check
every two or three months is suggested.
3.
All motors supplied with ASX ventilators carry a one year warranty from date of shipment. For repairs within
the warranty period, the motor must be taken to the motor manufacturer’s authorized service dealer. Contact your
ASX representative for additional warranty details.
4.
A periodic motor check should consist of spinning the motor shaft with the power off to be sure the motor turns
freely and the bearings run smoothly. The belt on belt driven units should be removed from the motor sheave.
5. CAUTION!
When removing or installing a belt, do not force the belt over the sheave. Loosen the motor mount
so that the belt can be easily slipped over the sheave.
6.
The belt on belt driven units should be removed and carefully checked for radial cracks, ply separation or
irregular wear. A small irregularity in the contact surface of the belt will result in noisy operation. If any of these
defects are apparent, the belt should be replaced. Check the sheave also for chipping, dents or rough surfaces
which could damage the belt.
7. CAUTION!
The correct belt tension is important. Too tight a belt will result in excess bearing pressure on
the motor bearings and shaft pillow blocks, and may also overload the motor. Too loose a belt will result in
slippage which will quickly “burn” out belts. A belt should feel “live” when thumped, approximately 1/4” belt
deflection when subjected to finger pressure (3 to 5 lbs.) at midpoint between sheaves.
8. CAUTION!
The belt alignment should also be checked to be sure the belt is running perpendicular to the
rotating shafts. Motor and drive shafts must be parallel. Improper alignment will result in excessive belt wear.
9. CAUTION!
Check sheave set screws to ensure tightness. Proper keys must be in keyways.
10. CAUTION!
Do not readjust blade pitch or fan RPM. If sheaves are replaced, use only sheaves of identical size
and type.
11.
If unit is to be left idle for an extended period (especially over summer months), it is recommended that belts
be removed and stored in a cool, dry place to avoid premature belt failure.
12.
The standard pillow block bearings on smaller ASX belt driven ventilators are permanently lubricated and are
supplied with an oil base corrosion preventive compound. These should not require any service except that
during the first few months of operation it is recommended the set screws holding the shaft be checked to be
sure they are tight. (Proper tightness will permanently deform Allen wrench.)
The standard pillow block bearings on larger ASX belt driven ventilators are factory lubricated and are
provided with external grease fittings. Relubrication annually or more frequently, if required, is recommended.
During the first few months of operations, it is recommended the set screws be checked to assure they are tight.
13.
The propeller should not require maintenance except for removing foreign materials that may accumulate on the
blades. The balance weights should not be disturbed. If a propeller has to be removed from the shaft, do not
apply force that will damage the bearings or warp the propeller. Use a wheel puller.
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