Adjust belt tension
Belt tension is very important to the proper operation of a fan and to the service life of a V-belt drive. The
belts on a new fan are properly adjusted; however, all V-belts stretch in the first few hours of operation. It is
necessary to readjust the belt tension after eight hours of running. After approximately 100 hours of
running, the belts should be adjusted again. Thereafter, tracking the number of hours the booth is in use
and periodic inspection are recommended so belts may be adjusted or replaced when necessary.
WARNING
Operating drives without guards in place can result in severe injury or death. If you remove any guards,
make sure you replace them before removing locks and restoring power.
WARNING
Before servicing, lockout/tagout the main electrical service to the device.
CAUTION
Do not tighten belts by changing the setting of the motor pulley as this changes the fan speed and may
damage the motor.
NOTICE
Over-tightening results in too much tension, causing excessive belt wear and noise. Under-tightening
results in too little tension, causing slippage at start-up and uneven wear.
• To service an air heater fan: Disconnect and lock out the main electrical service to the air heater.
• To service an exhaust fan: Disconnect and lock out the main electrical service to the exhaust fan.
1.
Measure the belt span as illustrated below.
A
B
C
A: Span length
B: Force
C: Deflection
2.
Calculate the required deflection by multiplying the belt span by 1/64.
For example, if the belt span is 32 inches, the belt deflection equals 1/2 inch (32 inches x 1/64 = 1/2
inch).
Service and maintenance
Global Finishing Solutions
38
239-062 rev 5
