18 – 6 Repair manual SWE100, 120, 120L, 120S, 140, 140L, 200D © BT
Lift mast – 7000
Main lift chain system 7120
T code Valid from serial no. Date Order no.
841×842×843 6061850- 2012-08-30 258946-120
side that rolls over the chain wheel. The minimum disc height (defined
as H3 in the figure) denotes the minimum permitted value of the disc
height.
Maximum permitted outline wear is 5% of the height H2. If a lifting chain
reaches the maximum level of wear, the chain must be replaced.
The nominal and minimum disc heights for each lifting chain are stated
in the table in the section “Stretching”.
Stretching
The amount of stretch on a lifting chain is measured on the part of the
chain that runs over the chain roller. The amount of stretch may, at the
most, be 2% on the most worn section of the chain.
The measurement is best made over 300-1000 mm of chain.
The nominal and maximum permitted chain lengths for lifting chains are
stated in the table below.
Wear to the bolts and around the holes on the discs are one reason why
the chain stretches. The chain should be replaced if stretching is more
than 2%.
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
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