MTU 12 V 4000 C10 Operating Instructions Manual page 15

Safety regulations after completion of maintenance and repair work
Before barring the engine, make sure that nobody is standing in the danger zone of the engine or plant.
Check that all guards have been reinstalled and that all tools and loose parts have been removed after
working on the engine or plant (in particular, the barring tool).
Welding work
Never carry out welding work on the assembly or plant, or attached units. Cover the engine or plant when
welding in its vicinity.
Before starting welding work:
• Switch off the power supply master switch.
• Disconnect the battery.
• Separate the electrical ground of electronic equipment from the ground of the unit.
No other maintenance or repair work must be carried out in the vicinity of the engine or plant while weld‐
ing is going on. Risk of explosion or fire due to oil vapors and highly flammable fluids and lubricants.
Do not use the engine or plant as ground terminal.
Do not route the welding lead over or near the wiring harnesses of the engine or plant. The welding cur‐
rent may otherwise induce an interference voltage in the wiring harnesses which could conceivably dam‐
age the electrical system.
Remove parts (e.g. exhaust pipes) which are to be welded from the engine beforehand.
Hydraulic installation and removal
Check the function and safe operating condition of tools and fixtures to be used. Use only the specified
devices 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.
Before starting work, pay attention to the following:
• Vent the hydraulic installation/removal tool, the pumps and the lines at the relevant points for the
equipment to be used (e.g. open vent plugs, pump until bubble-free air emerges, close vent plugs).
• For hydraulic installation, screw on the tool with the piston retracted.
• For hydraulic removal, screw on the tool with the piston extended.
For a hydraulic installation/removal tool with central expansion pressure supply, screw spindle into shaft
end until correct sealing is established.
During hydraulic installation and removal, ensure that nobody is standing in the immediate vicinity of the
component to be installed/removed.
Working on electrical and electronic assemblies
Always obtain the permission of the person in charge before commencing maintenance and repair work
or switching off any part of the electronic system required to do so.
De-energize the appropriate areas prior to working on assemblies.
Do not damage cabling during removal work. When reinstalling ensure that wiring is not damaged during
operation by contact with sharp objects, by rubbing against other components or by a hot surface.
Do not secure cables on lines carrying fluids.
Do not use cable binders to secure cables.
Always use connector pliers to tighten connectors.
Subject the device or system to a function check on completion of all repair work. In particular, check the
function of the engine emergency stop feature.
MS150049/02E 2012-11 | Safety | 15