66..2222 MaMasst t ssyysstteem / m / RReeppaaiir ir innssttrruuccttiionons s / / LLiifft t cchhaaiinnss
•• MeaMeasursure the the he heigeight oht of thf the che chain ain linlink pk platelates, ds, dimeimensnsion ion G in G in figufigurere 6.256.25. Max wear. Max wear
is 5%. Measure the original height where the chain is not worn is 5%. Measure the original height where the chain is not worn as a comparison.as a comparison.
Example: A chain has an original plate height of 23.2 mm, and therefore the plateExample: A chain has an original plate height of 23.2 mm, and therefore the plate
height should be at least 23.2 - 5% = height should be at least 23.2 - 5% = 23.2 x 0.95 = 22 mm.23.2 x 0.95 = 22 mm.
•• MakMake se sure ure thathan nn none one of of the the pinpins is in tn the phe platlates es havhave twe twististed, ed, seesee 6.266.26..
•• MaMake ke susure re ththat at ththerere ae are nre no co crarackcks is in thn the pe plalatetes.s.
•• LoLook ok fofor trr tracaces es of mof mecechhananicical al dadamamage ge or ror rusust.t.
•• CheCheck tck that that the che chahain ruin runs ens easiasily oly over ver the the pulpulley ley whewheel anel and dod does nes not jot jam.am.
•• LuLubrbricaicate te ththe ce chahain ain aftfter cer cleleananining ag and nd ininspspecectiotion.n.
Figure 6.25Figure 6.25 Measuring positionsMeasuring positions
Table 6.3Table 6.3
Chain dimensionChain dimension
ChainChain
dimensiondimension
(inches)(inches)
P (nominal)P (nominal)
PitchPitch
dimensiondimension
(mm)(mm)
P (true)P (true)
TrTrue pue pitchitch
dimensiondimension
(mm)(mm)
Measureed overMeasureed over
25 links New25 links New
chainchain
(mm)(mm)
Max overMax over
25 links25 links
2% elongation2% elongation
(mm)(mm)
11//22””--22**22 1122..7700 1122..5599 331144..7755 332211..0055
55//88””--44**44 1155..8888 1155..887755 339966..8888 440044..8811
33//44””--33**44 1199..0055 1199..0055 447766..2255 448855..7788
33//44””--44**44 1199..0055 1188..9911 447722..7755 448822..2211
11””--44**44 2255..4400 2255..3322 663333..0000 664455..6666
1 1 11//44””--44**44 3311..7755 3311..5544 778888..5500 880044..2277
1 1 11//22””--44**44 3388..1100 3388..0066 995511..5500 997700..5533
Figure 6.26Figure 6.26 Twisted pinTwisted pin
S
S
MM
169169
.1.1
P P PP
GG
SM 169.2SM 169.2
A A BB
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