© Munters Corporation, November 2019
24
QM1232r2
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 2 on the tensioner arm. Hold at this setting and tighten
the 10mm bolt to 40 ft.lbs. [54 N-m] torque
6PRRWK
3XOOH\
*URRYHG
3XOOH\
Motor
Sheave
Straight Edge
Belt
Idler Pulley
Propeller
Sheave
WARNING
!
Moving Parts: Disconnect
Power Before Servicing.
WARNING
!
Do Not Power Wash
Electrical Devices.
Mark 2 on Tensioner Arm
Hex on Tensioner Arm
10mm Bolt
Single Mark on Base