Taylor TX360L - Page 311

A-20A-20
TX / TXH / TXB 180S - 400L TX / TXH / TXB 180S - 400L (4/07)(4/07)
exceeds 5% of plate height of unused plate,exceeds 5% of plate height of unused plate, replace entire length of chain.replace entire length of chain.
7). Worn Outside Links or Pin Heads.7). Worn Outside Links or Pin Heads. (See illust(See illustration No. ration No. 9.) 9.) Check Check for misfor misalignment ofalignment of
the chain roller.the chain roller.
 Replace Replace the the chain chain if if wear wear is is significant. significant. Check Check (see (see Check Check Procedure) Procedure) the the chain chain for for allall
modes of failure. Ifmodes of failure. If nonenoneare found, eliminate the misalignment and place back into ser-are found, eliminate the misalignment and place back into ser-
vice.vice.

Modes of Chain Failure
Modes of Chain Failure
AAppppeeaarraanncce e aanndd//oor r SSyymmppttoomm PPrroobbaabblle e CCaauussee CCoorrrreeccttiioonn
1. Excessive Length (elongation)1. Excessive Length (elongation)
Measure section of chain that runsMeasure section of chain that runs
over sheaves.over sheaves.
3% wear elongation is maximum.3% wear elongation is maximum.
12 in. / 305 mm (New)12 in. / 305 mm (New)
12.3 in. / 314 mm (Worn)12.3 in. / 314 mm (Worn)
Normal WearNormal Wear
Permanent deformationPermanent deformation
(stretch) from overload(stretch) from overload
Replace chain immediatelyReplace chain immediately
and eliminate the sourceand eliminate the source
of overloads.of overloads.
2. Abnormal Protrusion or Turned Pins2. Abnormal Protrusion or Turned Pins
Excessive friction from highExcessive friction from high
loading and inadequate lubrica-loading and inadequate lubrica-
tiontion
Replace chain andReplace chain and
lubricate more frequentlylubricate more frequently
3. Cracked Plates3. Cracked Plates
(Fatigue)(Fatigue)
Loading beyond chain’s capac-Loading beyond chain’s capac-
ity (dropping load and catchingity (dropping load and catching
it)it)
Replace chain and eliminateReplace chain and eliminate
dynamic (impulse)dynamic (impulse)
overloadingoverloading
4. Arc-like Cracked Plates (Stress4. Arc-like Cracked Plates (Stress
Corrosion)Corrosion)
Severe rusting or exposure toSevere rusting or exposure to
acidic or caustic medium, plusacidic or caustic medium, plus
static stress at press fitstatic stress at press fit
between pin and plate. (Nobetween pin and plate. (No
Replace Replace chain chain and and protectprotect
from hostile environment byfrom hostile environment by
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