BT RRE140 - Main Lift Chain System (7120)

15 – 16 Repair Manual RRE140/160/180/200/250 © BT
Mast/Lift system 7000
Main lift chain system (7120)
T-code Valid from serial number Date Publication No.
815, 816 6051502 2008-08-21 261828-040
15.2 Main lift chain system (7120)
15.2.1 General
Applies to all trucks with masts.
DANGER!
When replacing a chain, the chain bolt should also be replaced.
15.2.2 Inspecting the chain
The chains are subject to two types of wear – plate wear and chain
elongation. Elongation is caused by wear to the bolts and plate holes.
The chains are also affected by the environment in which they are
used.
Noise
If there has been insufficient lubrication, there will be metallic friction on
the chain and this will result in noise.
The chain should be replaced.
Surface rust
Surface rust is easy to recognize as the chain will be reddish brown.
Deep-seated rust has generally started and the strength of the chain is
impaired.
The chain should be replaced.
Rusty links
Fretting corrosion results in a reddish brown powder being visible near
the outer plates. The chain can also appear to bleed when lubricated.
The chain should be replaced.