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Fan and motor pulleys belt tensioner, Fan drive components troubleshooting – L.B. White 350 Premier Dual Fuel User Manual

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1. The tensioner automatically applies proper tightness

to the belt during operation, and eliminates the need

for manually retightening the belt after service.

2. When replacing the belt, and during routine

maintenance, ensure tensioner is positioned as

shown in Fig.15 after belt removal.

FIG. 15

1. Remove belt guard from heater.

2. Remove belt from sheaves. See Belt Replacement.

3. Loosen set screw on fan and motor sheaves. See

figure for typical set screw location.

4. Remove sheaves and keys from fan shaft and motor.

FIG. 16

SET SCREW

SHAFT KEY

FAN AND MOTOR PULLEYS

BELT TENSIONER

TENSIONER PARALLEL

TO DIAGONAL SUPPORT

FAN DRIVE COMPONENTS TROUBLESHOOTING

Refer to the following table to identify basic problems,

causes and cures associated with V-Belt drive systems.

PROBLEM

CAUSE

SOLUTION

Belt sslips

Pulleys worn

Replace pulleys

(Belts bottoming out

in grooves)

Oil or grease on belt

Clean pulleys or

belt.

Belt B

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

SOLUTION

Belt JJumps

Drive misaligned

Check and realign

Pulley

Dirt entering pulleys

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 w

wearing

Belt hitting belt guard

Realign guard

rapidly

(check for loose

or missing guard

screws)

Worn pulleys

Replace pulleys

Dirt in pulleys

Remove dirt

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