© Munters Corporation, August 2021
30
QM1077r16
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 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 the 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 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.
