Maintenance
102
C2500CB-OM-EN-16
Chain Inspection
Inspect the chains for the following damage and defects:
Symptom
Appearance
Probable cause
Correction
Worn contour
Normal wear on sheave
Abnormal wear rubbing on
guides
Replace leaf chain when 5% worn
Check Leaf chain alignment or increase
clearance
Worn surfaces on
outer plates or pin
heads
Misalignment, rubbing on side
flanges
Check leaf chain alignment and correct
clearance as necessary
Tight joints
Dirt or foreign substance
packed in joints
or
corrosion or rust
or
bent pins
Clean & re-lubricate leaf chain
Replace leaf chain
Replace leaf chain
Missing parts
Missing at original assembly
Replace leaf chain
Abnormal
protrusion or turned
pins
Excessive internal friction
caused by high loading and
inadequate lubrication
Replace leaf chain, improve
lubrication and eliminate
overload conditions
Cracked
plates
(fatigue)
Crack from aperture
towards edge of linkplate at
90º to line of pull. Note there
is no linkplate distortion.
Loading beyond chain's
dynamic capacity (above
fatigue endurance limit)
Replace chain with leaf chain
of larger dynamic
capacity or eliminate
high load condition or
dynamic (impulse)
overloading
Fractured plates
(tension mode)
Note material distortion
High overload
Replace leaf chain and correct cause of
overload
Arc like cracked
plates
(stress corrosion)
Severe rusting or exposure to
acidic or caustic medium, plus
static pressure at press fit
(between pin and pin linkplate).
No cyclic stress is necessary
for this phenomenon to occur.
Replace leaf chain and protect from
hostile environment.
Enlarged holes
High overload
Replace leaf chain and correct cause of
overload
Corrosion pitting
Exposure to corrosive
environment
Replace leaf chain and protect from
hostile environment.
Worn leaf chain
anchor bolt
connecting pin
Normal wear
Replace worn leaf chain components
and always when fitting new leaf chains
