MTU 12 V 2000 M72 Operating Instructions Manual page 12

If welding has to be carried out on components (e.g. exhaust manifold), these components must first be
removed from the engine.
Hydraulic installation and removal
Check the tools and devices to be used for perfect operation and safe condition. Only use the specified
devices for force-fitting/removing parts.
Observe the maximum press-on pressure for the device for force-fitting/removing parts.
Do not attempt to bend or exert force on H.P. lines.
Observe the following before starting the pressing procedure:
• Bleed air from jigs and fixtures for force-fitting/removing parts, pumps and piping at the points provid‐
ed for the system concerned (e.g. open threaded vent plugs, pump until no bubbles can be discerned
in the oil, close threaded vent plugs).
• During the installation procedure, screw on device with pushed-in plunger.
• During the removal procedure, screw on device with retracted plunger.
For a hydraulic installation/removal tool with central expansion pressure supply, screw spindle into shaft
end until correct sealing is established.
During hydraulic installation/removal of components, ensure that no persons are in the direct vicinity of
the component being pressed.
Working on electrical/electronic assemblies
Before starting any maintenance or repair work, or before switching off any electronic components nec‐
essary to carry out the work, permission must first be obtained from the relevant manager or supervisor.
Before work is carried out on the assemblies, the power supply to the relevant areas must be switched
off.
Do not damage wiring during the removal work. When reinstalling, ensure that the wiring cannot be dam‐
aged during engine operation through contact with sharp edges, rubbing against a component or through
contact with a hot surface.
Do not secure cables on lines carrying fluids.
Do not use cable clamps to secure the lines.
Only tighten union nuts of connectors with connector pliers.
On completion of all repair work, the device or system must undergo a function check.
Before replacement, ensure that spare parts are correctly stored, i.e. in particular, protected against
moisture. Defective electronic components and assemblies must be suitably packed when dispatched for
repair, i.e. in particular, protected against moisture and impact and wrapped in antistatic foil if necessary.
Work with laser devices
When working with laser equipment, always wear special laser-protection goggles ⇒ eye injury through
strongly concentrated beam.
Laser devices must be equipped, in accordance with their class and usage, with protective devices for
ensuring safe operation.
For conducting light-beam procedures and measurement work, only the following laser devices may be
used:
• Laser devices in classes 1, 2 or 3A.
• Laser devices of class 3B, which have maximum output in the visible wavelength range (400 to 700
nm), a maximum output of 5 mW, and in which the beam axis and surface have been designed in
such a way as to prevent any risk to the eyes.
12 | Safety | M015650/03E 2011-10