Jungheinrich DFG 425 Operating Instructions Manual page 79

Electrical System: Only suitably trained personnel may operate on the truck's
electrical system. Before working on the electrical system, take all precautionary
measures to avoid electric shocks. For battery-operated trucks, also de-energise the
truck by removing the battery connector.
Welding: To avoid damaging electric or electronic components, remove these from
the truck before performing welding operations.
Settings: When repairing or replacing hydraulic, electric or electronic components or
assemblies, always note the truck-specific settings.
Tyres: The quality of tyres affects the stability and performance of the truck. When
replacing tyres fitted at the factory manufacturer's original spare parts must be used
exclusively otherwise the type sheet data cannot be adhered to. When changing
wheels and tyres, ensure that the truck does not slew (e.g. when replacing wheels
always left and right simultaneously).
Lift chains: Lift chains wear rapidly if not lubricated. The intervals stated in the
service checklist apply to normal duty use. More demanding conditions (dust,
temperature) require more regular lubrication. The prescribed chain spray must be
used in accordance with the instructions. Applying grease externally will not provide
sufficient lubrication.
Hydraulic hoses: The hoses must be replaced every six years. When replacing
hydraulic components, also replace the hoses in the hydraulic system.
F 2