1
Improper tension
CheckDeflection: 1/64" per inch of span at midpoint with 4–5 lb push.
FixTension per OEM; recheck after 8 run-hours on new belts.
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2
Misaligned sheaves
CheckStraight-edge across sheave faces. Laser alignment best.
FixShim motor; verify sheaves on same plane.
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3
Worn sheave grooves
CheckPlace new belt in groove — should ride flush with top, not sink.
FixReplace sheaves AND belts together.
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4
Oil contamination
CheckVisible oil on belts; check airend front seal / engine seal.
FixFix leak source; replace belts.
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5
Mismatched belt set
CheckCheck part numbers and length codes.
FixReplace as matched set from same manufacturer batch.
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Safety
Lockout/tagout before opening enclosures. Verify zero energy. Bleed system pressure before opening any pneumatic connection.