Main lift chain system – 7120 Chain inspection T-code 787, 788
Valid from serial number 931876-
Date 2006-04-10
Order number 232370-040
12.3.8 Stretching The amount of stretch on a lift chain is measured on the part of the chain that runs over the chain sprocket. The amount of stretch may, at the most, be 2% on the most worn section of the chain. Measurement is suitably made over 300-1000 mm of the chain. The nominal and maximum permitted chain lengths for lift chains are stated in the table below.
Table 38: Stretching Type of chain
Nominal disc height H2 ( mm)
Minimum disc height H3 (mm)
Pitch P (mm)
Nominal chain length for 20/30/ 50 discs (mm)
Maximum permitted chain length for 20/ 30/50 discs (mm)
3/4”, 2x3
17.8
16.9
19.05
381/572/953
389/583/972
3/4”, 3x4
17.8
16.9
19.05
381/572/953
389/583/972
3/4”, 4x6
17.8
16.9
19.05
381/572/953
389/583/972
1”, 4x4
23,6
22,4
25,4
508/762/1270
518/777/1295
1”, 6x6
23,6
22,4
25,4
508/762/1270
518/777/1295
Wear to the bolts and around the holes on the discs are a reason why the chain stretches. The chain should be replaced if stretching is more than 2%.
12- 4
Service Manual
7LOP10CW, 7LOP10CF
© TIEE SARL
