Cleaning And Care - Mercedes-Benz Unimog Operating Instructions Manual

Cleaning and care

290
Clean the light-alloy wheels regularly.
In addition, observe the notes in the "High-
pressure cleaning" section (
After driving off-road or on a construc-
tion site
! Only direct the compressed-air, steam or
water jet towards the radiator surface in a
vertical direction. Ensure that the radiator
fins are not damaged. Remove any dirt from
the radiator fins. Damaged or dirty radiator
fins can cause the engine to overheat. If
there is a loss of coolant or damage to the
cooling and heating system, have it
checked at a qualified specialist workshop.
Foreign bodies that have become trapped can
be expelled during the journey, e.g stones in
the tyre tread.
Check the tyres for foreign bodies that have
become trapped after every journey off-road
or on a construction site and before journeys
on public roads. Remove any trapped foreign
bodies.
Dirt and mud on the tyres and on the road
surface reduce road grip, particularly if the
road surface is wet. This could cause your
vehicle to skid.
Dirt and mud on steps and door sills make
them less safe to tread on. This could cause
you to slip from the steps and injure yourself.
Always clean your vehicle carefully after every
journey off-road or on a construction site and
before journeys on public roads.
When driving off-road, dirt, sand, mud and
water mixed with oil, for example, can soil the
brakes. This can lead to reduced braking per-
formance or to total failure of the brakes, also
from increased wear. The braking character-
istics change depending on the material that
has penetrated. Clean the brakes after driving
off-road. If you then notice grinding noises or
a reduction in braking performance, have the
brake system checked at a qualified special-
ist workshop as quickly as possible. Adapt
your driving style to the altered braking con-
ditions.
Y page 288). The following vehicle parts in particular must
be cleaned:
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After operation in mud, sand, water or after
exposure to similar dirty conditions:
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! To maintain a high level of anti-corrosion
lighting system
windows
exterior mirrors
access steps and entrances
grab handles
tyres, wheels and wheel arches
steering, axles and brakes
suspension elements and chassis frame
licence plate
radiator, engine and transmission
Remove any trapped foreign bodies, e.g.
stones.
Clean brake discs, brake linings, wheels
and axle joints and check them for damage.
If necessary, lubricate the axle joints
(observe the information in the Mainte-
nance Booklet).
Test the brakes.
Chassis and underbody protection
protection you must observe the following:
do not wash the vehicle until the fourth
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week after delivery.
when washing the chassis and under-
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body with a high-pressure cleaner,
ensure that the water temperature is not
set above 40 † and the spray pressure
does not exceed 30 bar.
do not use rapeseed oil, petrol, diesel or
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other solvents for cleaning. They can
cause the dual-layer protection to dis-
solve or peel off.
only use a pH-neutral cleaner, not alka-
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line or acidic products.