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© Munters Corporation, January 2020
QM1086r8
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:
Check condition of belt, if worn, replace
belt. If belt is in good condition then make sure the tensioner is in
the correct position. Looking from the inlet of the fan, the correct
position of the tensioner is approximately the 7 o'clock position.
See Figure 14A
.
To adjust the tensioner, loosen the 10mm bolt fastening the
tensioner to the motor base (using 17mm end wrench) to allow
tensioner arm to rotate. Place a 27mm (1
1
⁄
16
”) wrench onto the
hex on tensioner. Turn the wrench clockwise until the Alignment
Mark is at Mark 2 on the tensioner arm.
See Figure 14B.
Hold
tensioner at this setting and tighten the 10mm bolt to 40 ft. lbs.
[54 N-m] torque.
Motor
Pulley
Straight Edge
Belt
Idler
Pulley
Propeller
Pulley
Smooth
Pulley
Grooved
Pulley
Incorrect
location
Correct
location
Maintenance
Chapter 5
Alignment Mark
Hex
Figure 14B
Mark 2
Figure 14A
