© Munters Corporation, August 2021
26
QM1231r10
Maintenance
Chapter 5
5)
CHECKING PULLEYS:
Roll the belt off and look at all pulleys. If a 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.
6)
CHECK DRIVE ALIGNMENT:
Check alignment of belt on idler pulley, it should be
centered on the idler pulley. The belt tensioner idler pulley and propeller sheave are fixed
in position, therefore, alignment must be obtained by adjusting the motor sheave. If an
adjustment is needed, remove the belt, then
loosen the set screws in the sheave and move
as necessary to achieve proper alignment.
Remember to tighten the sheave set screws
after making an adjustment. Drive alignment is very
important for long belt life and proper operation.
7)
BELT TIGHTENING:
To adjust belt tensioner to proper setting, loosen 10 mm bolt (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 clockwise until the single mark on base
of belt tensioner is aligned with Mark 3 on tensioner arm. Hold tensioner at this setting and tighten
10mm bolt to 40 ft.-lbs [54 N-m] torque.
Smooth
Pulley
Grooved
Pulley
Motor
Sheave
Straight Edge
Belt
Idler Pulley
Propeller
Sheave
Single Mark on Base
Mark 3 on Tensioner Arm
10mm Bolt
Hex on Tensioner Arm
WARNING
!
Moving Parts: Disconnect
Power Before Servicing.
WARNING
!
Do Not Power Wash
Electrical Devices.
