Mast/Lift system 7000
Main lift chain system (7120)
Publication No. Date Valid from serial number T-code
261828-040 2008-08-21 6051502 815, 816
© BT Repair Manual RRE140/160/180/200/250 15 – 19
Elongation
The elongation of a lift chain is measured on the part of the chain that
passes over the chain wheel. Elongation in the section of chain where
wear is greatest may not exceed 2%. The measurement is best made
over 300-1000 mm of chain.
The nominal and maximum permitted chain lengths for the relevant lift
chain are specified in the table below.
One cause of chain elongation is wear on the bolts and around the
holes in the plates. The chain must be replaced if elongation exceeds
2%.
Damage
If there is any other damage, the chain should be replaced.
Type of
chain
Nominal
plate height
H2 (mm)
Minimum
plate height
H3 (mm)
Pitch P
(mm)
Nominal chain
length for 20/30/50
plates (mm)
Maximum permitted
chain length for 20/30/50
plates (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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