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© Munters Corporation, December 2019
QM1059r6
Maintenance
Chapter 5
Motor
Pulley
Straight Edge
Belt
Idler
Pulley
Propeller
Pulley
Smooth
Pulley
Grooved
Pulley
6)
CHECK DRIVE ALIGNMENT:
Check to make sure the belt is
centered on the idler pulley, then use a straight edge to check
the alignment of the drive pulleys. If an adjustment is needed,
remove the belt, then loosen the set screw in one pulley and move
it. Remember to tighten the set screw after making an adjustment.
Drive alignment is very important for long belt life and proper
operation.
7)
CHECKING PULLEYS:
Roll the belt off and look at both pulleys.
If the pulley has grooves in it or is no longer smooth, it needs
replacement. A loose or slipping belt will reduce fan performance
up to 60% and cause premature belt failure.
8)
BELT TENSIONING:
All belts must be checked for proper tension after the first 3 days of
fan operation and every 4-6 months thereafter.
Solid Belt
To adjust the belt tensioner to the proper setting, loosen 10 mm
bolt fastening tensioner to bracket (using 17mm end wrench) to
allow tensioner arm to rotate. Working from inlet/motor side of
fan, place a 27 mm (1
1
⁄
16
”) wrench onto the hex on the tensioner.
Turn wrench counterclockwise until the single mark on base of the
belt tensioner is aligned with mark 4 on the tensioner arm. Hold
tensioner at this setting and tighten the 10mm bolt to 40 ft. lbs.
[54 N-m] torque.
AeroLink Belt
• Roll the belt off the pulleys by forcing it sideways off the
larger pulley as you turn the drive by hand.
• Reinstall the belt by wrapping it around the smaller pulley and
then starting it over the larger pulley.
• As you continue rolling it onto the larger pulley, the belt
should become taut in the position shown below.
• If the belt becomes taut before reaching the position shown,
add one link and try again.
• If the belt is loose when in the position shown, remove one
link and try again.
Alignment
Mark
Hex
Mark 4
