388
1
1
A
B
C
D
E
Wear on Sidewalls Wear on Sidewalls
Edge Cord Failure Edge Cord Failure
Wear on Top Corner Wear on Top Corner
Surface Flaking Sticky or Swollen Surface Flaking Sticky or Swollen
A
B
C
D
E
Cracking Cracking
F
G
H
I
J
Wear on Top Surface Wear on Top Surface
Surface Hard or Stiff Surface Hard or Stiff
High Belt Temperature High Belt Temperature
Wear on Bottom Surface Wear on Bottom Surface
F
G
I
J
Vibration Vibration
Probable Cause
Corrective Action
A
Cracking Sheaves too small for belt section
Use larger diameter sheaves Retension to manufacturer’s recommendations Increase backside idler to acceptable diameter Undercord Sidewall Burn or Hardening Wear on Bottom Corner Undercord Sidewall Burn or Hardening Wear on Bottom Corner M N
K
L
O
Undercord Cracking Undercord Cracking
Turns Over or Comes of Drive Turns Over or Comes of Drive
Unusual Noise Unusual Noise
K
L
O
Belt slip
Backside idler diameter too small
Improper belt storage
Don’t coil belt too tightly, kink, or bend. Avoid heat & direct sunlight
Excessive hot or cold temperature
Control drive environment
B
Wear on Sidewalls Belt slip Sheave misalignment P Top of Tie Band Damaged P Top of Tie Band Damaged
Retension to manufacturer’s recommendations
Q
R
Tie Band Separation Tie Band Separation
Q
R
Realign drive Broken Belt Broken Belt
Worn sheaves Incorrect belt
Replace sheaves
Replace with correct belt size; refer to owner’s manual
C
Edge Core Failure Sheave misalignment Damaged tensile member Worn or incorrect sheaves
Check alignment & correct
Follow correct installation procedure; refer to owner’s manual
Replace sheaves for correct belt/sheave match; refer to equipment manufacturer’s parts manual
Severe shock load
Inspect engine PTO clutch
D
Wear on Top Corner Belt-to-sheave fit incorrect
Use correct belt/sheave according to manufacturer’s specifications
Belt rubbing against guard or drive structure
Remove obstruction
E
Surface Flaking Sticky or Swollen Oil or chemical contamination
Replace belt if contaminated with oil or grease
F
Wear on Top Surface Belt rubbing against guard
Repair or replace guard Repair or replace idler
Damaged idler
G
Surface Hard or Stiff Hot drive environment
Improve ventilation to drive; ensure area is free of debris Retension to manufacturer’s recommendations
Belt slip
H
Unusual Vibration Incorrect belt
Use correct belt/sheave according to manufacturer’s specifications
Poor equipment structural design Sheave is dimensionally incorrect
Check structure for adequate strength & rigidity
Replace defective sheave
Loose drive components
Check machine components, guards, motor mounts, motor pads, bushings, brackets & frame- work for adequate strength, stability & installation
I
High Belt Temperature Hot drive environment
Improve ventilation to drive; ensure area is free of debris
Slipping
Retension until slipping stops
J
Wear on Bottom Surface Belt bottoming against sheave groove bottom Use correct belt/sheave according to manufacturer’s specifications Worn sheaves Replace sheaves Debris in sheaves Clean sheaves
2025
TechnicalServices@OregonProducts.com 1.800.223.5168
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