MTU 12V4000M73 series Operating Instructions Manual page 16

Welding work
Welding operations on the product or mounted units are not permitted. Cover the product when welding in
its vicinity.
Before starting welding work:
• Switch off the power supply master switch.
• Disconnect the battery cables or actuate the battery isolating switch.
• Separate the electrical ground of electronic equipment from the ground of the unit.
No other assembly, maintenance, or repair work must be carried out in the vicinity of the product while weld-
ing is in progress. There is a risk of explosion or fire due to oil vapors or highly flammable fluids and lubri-
cants.
Do not use product as ground terminal.
Never position the welding power supply cable adjacent to, or crossing wiring harnesses of the product. The
welding current can induce interfering voltages in the wiring harnesses which may damage the electrical sys-
tem.
Remove components (e.g. exhaust pipe) from the product before performing necessary welding work.
Hydraulic installation and removal
Check the function and safe operating condition of tools and fixtures to be used. Use only the specified devi-
ces for hydraulic removal/installation procedures.
Observe the max. permissible push-on pressure specified for the equipment.
Do not attempt to bend or apply force to lines which are under pressure.
Before starting work, pay attention to the following:
• Vent the installation/removal jig, the pumps and the pipework at the relevant designated points.
• For hydraulic installation, screw on the jig with the piston retracted.
• For hydraulic removal, screw on the jig with the piston extended.
For a hydraulic installation/removal jig with central expansion pressure supply, screw spindle into shaft end
until correct sealing is established.
During hydraulic installation and removal of components, ensure that nobody is standing in the immediate
vicinity of the component to be installed/removed.
Working with batteries
Observe the safety instructions of the manufacturer when working on batteries.
Gases released from the battery are explosive. Avoid sparks and naked flames.
Do not allow battery acids to come into contact with skin or clothing.
Wear protective clothing, goggles and protective gloves.
Do not place objects on the battery.
Before connecting the cable to the battery, check the battery polarity. The battery may explode and spray
acid if the battery terminals are connected incorrectly.
Working on electrical and electronic assemblies
Always obtain the permission of the person in charge before commencing assembly, maintenance, and repair
work or switching off any part of the electronic system required to do so.
De-energize the relevant areas prior to working on assemblies.
ESD (Electrostatic Discharge): Work on components which could be damaged by electrostatic discharge
must always be carried out with appropriate equipment. Appropriate equipment is e.g. electrically conductive
work surfaces or antistatic wristbands.
14 | Safety | MS150045/03E 2018-08