Lift mast – 7000

Main lift chain system

in the figure and denotes the minimum permitted value of the disc height.

Maximal permitted outline wear is 5% of the height H2. If a lift chain reaches the maximum level of wear, the chain should be replaced.

The nominal and minimum disc heights for respective lift chains are stated in the table in the chapter “Stretching”.

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.

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%.