Qmark WEB -Heavy-Duty Belt Drive Exhaust Fans - Manual (Page 4)

GENERAL MAINTENANCE
CAUTION: Before any maintenance or service is performed, be sure that unit is disconnected
from power source to prevent accidental starting.
Periodic inspection of all the fan parts is the key to good maintenance and trouble free
fan operation. Frequency of inspection must be determined by the user and is dependent upon
the severity of the application.
NEVER SERVICE OR ADJUST ROTATING EQUIPMENT WHILE IT IS OPERATION.
LOCK OUT THE POWER SOURCE BEFORE PERFORMING MAINTENANCE.
Regular fan maintenance should include the following:
CAST ALUMINUM & METAL PARTS
A. Cast aluminum and steel parts usually do not require maintenance during the life of the unit
except painted metal surfaces that require periodic repainting. In a severe, dirty operation,
the propeller should be cleaned with a wire brush to prevent an accumulation of foreign mat-
ter that could result in fan unbalance. After cleaning propeller, inspect for possible cracks or
excessive wear, which can cause unbalance. DO NOT operate a propeller that is cracked,
chipped, broken blades or excessive wear.
NOTE: If propeller set screws are loosened and/or propeller is removed from shaft, set screws
must be replaced. Set screws cannot be used more than once.
MOTOR MAINTENANCE
B. 1. Removing dust and dirt: Blowout open type motor windings with low pressure air to re-
move dust or dirt. Air pressure above 50 P.S.1. should not be used as high pressure may
damage insulation allowing excessive temperatures.
2. Lubrication: Under normal conditions, ball bearing motors will operate for five years with-
out re-Iubrication. Under continuous operation at higher temperatures (exceeding 104°F.
ambient) or dusty atmosphere, re-Iubricate after one year. Bearings are located in the
end shields of the motor. Repack each bearing and fill cavity in back of bearings 1/3 full
with Alvaniz Grease NO.2 (Shell Oil Company) or equivalent.
Motors with non-regreasable, sealed-bearings require no lubrication for the life of the bearing.
V-BELT DRIVES
C. Care should be taken not to over tighten V-belt drive.
Excessive belt tension overloads fan and motor bearings. It is much less expensive to replace
belts worn from slippage than to replace bearings damaged from excessive loading.