FAN DRIVE COMPONENTS TROUBLESHOOTING
Refer to the following table to identify basic problems,
causes and cures associated with V-Belt drive systems.
PROBLEM
CAUSE
CURE
Belt slips
Pulleys worn
Replace pulleys
(Belts bottoming out
in grooves)
Oil or grease on belt
Clean pulley or
belt.
Belt Breaks
Improper belt
Belt pried over
installation
pulleys using
sharp or pointed
tools. Install new
belt properly.
Improper belt
Ensure belt
tension.
tensioner is
positioned
properly.
PROBLEM
CAUSE
CURE
Belt Jumps
Drive misaligned
Check and realign
Pulley
Dirt entering pulley
Remove belt,
Grooves
clean the pulleys
Belt hitting belt guard
Realign guard
(check for loose
or missing guard
screws)
Belt
Dirt or grease on
Remove dirt or
Cracking
belt or aged belt
replace belt.
Belt wearing
Belt hitting belt guard
Realign guard
rapidly
(check for loose
or missing guard
screws)
Worn pulley
Replace pulley
Dirt in pulleys
Remove dirt
1.
Remove belt guard from heater.
2.
Remove belt from pulleys. See Belt Replacement.
3.
Loosen set screw on fan and motor pulleys. See Fig.
16 for typical set screw location.
4.
Remove pulleys and keys from fan shaft and motor.
FIG. 16
SET SCREW
SHAFT KEY
16
FAN AND MOTOR PULLEYS
1.
The tensioner automatically applies proper tightness
to the belt during operation, and eliminates the need
for manually retensioning the belt after service.
2.
W h e n r e p l a c i n g t h e b e l t , a n d d u r i n g ro u t i n e
maintenance, ensure tensioner is positioned as
shown in Fig.15 after belt removal.
FIG. 15
BELT TENSIONER
TENSIONER PARALLEL
TO DIAGONAL SUPPORT