Maintenance
Introduction to maintenance
Like all other
technical equipment, the vehicle requires care and maintenance. The scope and
frequency of maintenance work mainly depends on the operating conditions, which
can differ widely.
The enclosed
Maintenance Booklet contains information on the scope and frequency of
maintenance work and notes on warranty, service products and maintenance
work.
A
qualified specialist workshop, e.g. a Mercedes-Benz Service Centre, will
confirm the service work it has carried out in the Maintenance Booklet.
Inspection and
maintenance work requires special skills that cannot be acquired by reading
these Operating Instructions. It is advisable to have this work carried out by
trained and skilled personnel.
Always have
maintenance work carried out at a qualified specialist workshop. Mercedes-Benz
recommends that you use a Mercedes-Benz Service Centre for this purpose to
ensure that maintenance work is carried out using the special skills and tools
required. All work relevant to safety or on safety-related systems must be
carried out at a qualified specialist workshop.
Expert technicians,
the latest technical information supplied by the factory along with
state-of-the-art tools and facilities ensure that the vehicle is serviced to
the highest professional standards.
 | Risk of injury |
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Before carrying out maintenance operations and repairs, please make sure that you read the relevant sections of the technical documentation, such as the operating instructions and workshop information.
In particular, you should also familiarise yourself with the legal requirements such as safety at work and accident prevention measures.
You could otherwise fail to recognise dangers and thereby injure yourself or others.
You must secure the vehicle on axle stands of sufficient load bearing capacity if work is being carried out beneath it.
Never use the vehicle jack instead of stands. There is a danger that the jack could give way and the vehicle could slip, resulting in personal injuries or material damage.
The vehicle jack is intended only to raise the vehicle for a short time.
Only have maintenance work carried out at a qualified specialist workshop which has the necessary specialist knowledge and tools to carry out the work required.
Mercedes-Benz recommends that you use a Mercedes-Benz Service Centre for this purpose. All work relevant to safety or on safety-related systems must be carried out at a qualified specialist workshop.
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 | Environmental note |
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If circumstances demand that you have to do some maintenance work yourself, you must observe the environmental protection requirements. When disposing of service products, e.g. engine oil, you must comply with the legal requirements. This also concerns all parts, e.g. filters, that have been in contact with service products. For vehicles operated on FAME fuel, you must observe the special instructions on disposing of engine oil. For more information, visit a qualified specialist workshop, e.g. a Mercedes-Benz Service Centre. Dispose of empty containers, cleaning cloths and care products in an environmentally responsible manner. Observe the instructions for care products. Do not let the engine run longer than necessary when stationary.
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Replacement
parts
Make sure that replacement
parts are suitable for the vehicle. In some countries, replacement parts that
constitute a modification to the vehicle can result in the invalidation of the
vehicle's general operating permit if they:
-
change the type of
vehicle approved in the general operating permit
-
create a possible
risk for road users
-
adversely affect
the emission or noise levels
The use of
non-approved parts could impair the vehicle's safety.
Telligent® maintenance system (WS)
The Telligent® maintenance system determines the intervals of oil changes on large assemblies and general maintenance work based on the vehicle's operating conditions.
The on-board computer provides a constant overview of the scheduled service due dates for the vehicle and its assemblies more.
An initial message that service work is required appears 14 days before the service due date. Additional messages will appear if the service due date is reached or exceeded more.
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The first service message can be programmed to appear between 0 and 30 days before the service due date. Further information is available from any Mercedes-Benz Service Centre.
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Confirm the maintenance work that has been carried out in the display of the on-board computer more.
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If you confirm service work but do not have the work carried out within the specified time, this can lead to increased wear and damage to the vehicle or the assemblies. Only confirm service due dates after the service work has been carried out.
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If the work is carried out at a Mercedes-Benz Service Centre, the fact that the work has been carried out professionally will be confirmed in both the on-board computer and the Maintenance Booklet.
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Maintenance flap
| Risk of injury |
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When opening or closing the maintenance flap, any persons in the swinging range of the maintenance flap could be injured or objects could be damaged.
Make sure that there are no persons or objects standing in the swinging range of the maintenance flap.
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 | Release lever |
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Opening
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Push release lever inwards on both sides.
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The maintenance flap swings upwards.
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Closing
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Swing the maintenance flap down.
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Press on the maintenance flap on the left and right sides until you hear it engage in the catch.
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Swing the maintenance flap down.
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Press on the maintenance flap on the left and right sides until you hear it engage in the catch.
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Coolant level
Coolant consists of water with antifreeze protection and corrosion inhibitor. Only check the coolant level with the vehicle standing on a level surface and when the engine is cold.
If the fluid level in the coolant expansion tank is too low, 
will appear on the display. The status indicator also lights up in red.
Checking coolant level and topping up
The coolant expansion tank is located behind the cab on the right.
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| Cap |
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Coolant expansion tank
Only check the coolant level after the engine has cooled down.
| Risk of injury |
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The cooling system is pressurised. Only unscrew the cap of the coolant expansion tank after the engine has cooled down. You could otherwise be scalded by hot coolant.
Wear gloves and eye protection.
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Slowly turn cap anticlockwise about half a turn to relieve excess pressure.
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Unscrew tank cap completely.
The coolant in the expansion tank must reach up to the edge of the filler neck.
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Observe the correct coolant mixture ratio and the required water quality.
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You will find further information about coolant in the "Service products" section more.
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Top up the coolant in the expansion tank until it reaches the edge of the filler neck.
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Replace coolant expansion tank cap and tighten it up to the stop.
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Run the engine briefly at varying engine speeds.
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Check the coolant level and top up if necessary.
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Windscreen washer system
| Risk of fire |
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Windscreen washer concentrate is highly flammable. Fire, naked flames and smoking are prohibited when windscreen washer concentrate is being handled.
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Add a commercially-available windscreen washer concentrate for summer or winter to the water.
If the fluid level in the supply reservoir for the windscreen washer system is too low, the 
symbol appears in the display and the status indicator lights up yellow.
The supply reservoir for the windscreen washer system is behind the cab.
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| Windscreen washer system supply reservoir cap |
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Unscrew the cap of the windscreen washer system supply reservoir.
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Refill the reservoir.
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Replace the cap of the windscreen washer system supply reservoir and turn it clockwise to fasten it.
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Engine oil level
Checking the
engine oil level
The oil level in the engine can be checked in the on-board
computer
more.
Check the engine
oil level at normal operating temperature, approximately 1 minute after
stopping the engine. Check the engine oil level when the engine is cold,
approximately 5 to 10 minutes after stopping the engine. If the topping-up
quantity is called up too early, the missing quantity displayed may be too
large.
Topping up the
engine oil
If the engine oil
level is too low, the status indicator lights up and
appears in the
display with the required topping-up quantity.
If the oil level in
the engine is too high, the status indicator lights up and
appears in the
display.
If the engine oil level cannot be displayed correctly,
appears in the
display with a display message.
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Do
not add the topping-up quantity shown until
has appeared.
Then add the complete quantity recommended. Mercedes-Benz recommends that you
add the amount of oil displayed in the
Monitoring Info
menu before starting long journeys.
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Tilt the cab
forwards
more.
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| Cap |
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Oil filler neck
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Unscrew and remove
cap .
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Top up the
oil.
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Use only approved engine oils in the specified SAE viscosity classes.
Drain or siphon off excess oil.
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Approved engine
oils
more.
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Replace cap
and screw it
on. Make sure it is correctly seated and not leaking.
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Tilt the cab back
into the drive position
more.
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Oil level in the automatic transmission
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If the  indicator lamp is lit or flashing while driving, the temperature of the transmission oil or coolant is too high. The reason for this may be that the transmission oil level is high or too low. If the transmission fluid temperature is too high for a prolonged period, the transmission may be damaged.
Only use approved transmission oils of the specified SAE viscosity classes. Do not overfill the reservoir. Any excess oil must be drained or siphoned off. There is a risk of transmission damage.
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High transmission fluid temperature more.
Checking the transmission oil level in the display
Starting the transmission oil level measurement
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Park the vehicle on flat, level ground.
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Apply the parking brake.
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Shift the transmission to the neutral position and let the engine run at idling speed.
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Press buttons  and  at the same time.
In display , numbers 8 to 1 appear one after another to ensure that a waiting time of approximately 2 minutes is kept.
Afterwards, a code for the transmission oil level or a fault code appears in the display.
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Transmission oil level display
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Code
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Meaning
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oL oK
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The transmission oil level is correct.
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oL Lo
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The transmission oil level is too low.
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The number subsequently displayed indicates the transmission oil level that must be filled, for example 01 = 1 litre
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oL HI
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The transmission oil level is too high.
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The number subsequently displayed indicates the transmission oil level that must be drained or siphoned off, for example 01 = 1 litre
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Fault code display during the transmission oil level measurement
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Code
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Meaning/remedy
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oL 50
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The engine speed is too low.
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Run engine at idling speed.
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oL 59
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The engine speed is too high.
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Run engine at idling speed.
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oL 65
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Neutral N is not selected in the transmission.
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Shift the transmission to neutral N.
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oL 70
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The transmission oil temperature is too low.
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Leave the engine running until the transmission oil reaches operating temperature.
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oL 79
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The transmission fluid temperature is too high.
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Switch off the engine until the transmission oil reaches operating temperature.
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oL 89
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The vehicle is moving.
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Stop the vehicle and apply the parking brake.
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oL 95
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The transmission oil sensor is defective.
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Check the transmission oil level with the oil dipstick.
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Have the fault checked at a qualified specialist workshop.
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Ending the transmission oil level measurement
Checking the transmission oil level with the oil dipstick
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| Oil dipstick |
| Oil filler neck |
| Hot range |
 | Cold range |
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Park the vehicle on flat, level ground.
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Apply the parking brake.
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Shift the transmission to neutral N.
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Start the engine and let it run at idling speed for approximately 1 minute.
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Shift the transmission to D and wait approximately 30 seconds.
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Shift the transmission to R and wait approximately 30 seconds.
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Shift the transmission to N and wait approximately 30 seconds.
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Switch off the engine.
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Tilt the cab forwards more.
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Start the engine while the cab is tilted forwards and let it run at idling speed more.
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Remove oil dipstick from oil filler neck .
At normal transmission operating temperature: the oil level must be within hot range marking on dipstick .
When the transmission is cold: the oil level must be within cold range marking on dipstick .
Check the oil level at normal transmission operating temperature again.
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Do not fill the transmission oil above the hot range marking.
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Check that oil dipstick is secure and tight.
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Switch off the engine more and tilt the cab back into the drive position more.
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Oil level in the auxiliary steering
If the oil level in the supply reservoir of the auxiliary steering is too low, the warning lamp goes on.
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If the oil level in the auxiliary steering supply reservoir is too low, the auxiliary steering hydraulic system may be leaking.
Have the auxiliary steering checked and repaired at a qualified specialist workshop which has the necessary specialist knowledge and tools to carry out the work required.
Mercedes-Benz recommends that you use a Mercedes-Benz Service Centre for this purpose.
All work relevant to safety or on safety-related systems must be carried out at a qualified specialist workshop.
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| Oil filler opening/oil dipstick |
| Max. mark |
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To refill the oil:
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Unscrew and remove oil dipstick and check the oil level.
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The oil level must be near the maximum mark .
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If the oil level is too low:
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Top up the oil.
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Only use approved oils.
Do not top up oil above the maximum mark.
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Approved oils more.
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Screw on oil dipstick and tighten.
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Have the auxiliary steering checked immediately to make sure it is not leaking.
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Ignition system
Vehicles with a natural gas engine:
| Risk of injury |
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The ignition system uses high voltage. For this reason, you must never touch components of the high voltage ignition system (ignition module, ignition coil, ignition cables, spark plug connections, etc.) while:
You could otherwise get an electric shock and injure yourself severely or even fatally.
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Spark plugs
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For iridium 14FR-4 DIU spark plugs, check the electrode spacing before installation, and correct it if necessary.
If the electrodes are not at the correct spacing from one another, the idling speed could be uneven.
Only have spark plugs replaced at a qualified specialist workshop which has the necessary specialist knowledge and tools to carry out the work required.
Mercedes-Benz recommends that you use a Mercedes-Benz Service Centre for this purpose.
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Vehicle assemblies
Check the assemblies regularly for leaks. If fluid is lost (e. g. there are oil stains where the vehicle was parked), have the cause found and rectified immediately at a qualified specialist workshop which has the necessary specialist knowledge and tools to carry out the work required.
Mercedes-Benz recommends that you use a Mercedes-Benz Service Centre for this purpose. All work relevant to safety or on safety-related systems must be carried out at a qualified specialist workshop.
| Environmental note |
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When used improperly, service products are harmful to the environment.
Do not allow service products to run into the sewage system, surface water or into the ground.
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Checking anti-corrosion protection
The cab is fitted
as standard with body cavity protection and underbody protection.
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Note that road salt has a corrosive effect. In winter, wash the vehicle more frequently in order to remove salt residue.
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Frequently examine
the vehicle for signs of corrosion damage. Pay special attention to possible
damage of compressed-air lines and hydraulic lines.
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As a precautionary
measure, spray the underside of the vehicle with a wax-based protective
agent.
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Repair any damage
to the anti-corrosion protection applied at the
factory.
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Batteries
| Risk of explosion and injury |
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Risk of explosion. Explosive oxyhydrogen is produced when batteries are being charged. Only charge the batteries in a well-ventilated area.
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Risk of explosion. Avoid creating sparks. Avoid fire, naked flames and do not smoke when handling the battery.
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Battery acid is caustic. Wear acid-resistant protective gloves. Any splashes of acid on skin or clothing must be neutralised immediately using soapy water or acid neutraliser and then cleaned with water.
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Wear eye protection. When mixing water and acid, the liquid may splash into your eyes. Rinse acid splashes to the eyes immediately with clean water and contact a doctor immediately.
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Keep away from children. Children are not able to evaluate the risk involved in handling batteries and acid.
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Always observe the safety instructions, protective measures and procedures specified in these Operating Instructions when handling the battery.
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| Environmental note |
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Batteries contain pollutants. Do not dispose of used batteries with household rubbish.
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Dispose of old batteries in an environmentally responsible manner. Hand in batteries at a specialist workshop, a Mercedes-Benz Service Centre or a collection point for used batteries.
Transport and store full batteries in an upright position. Secure batteries against tipping over during transport. Battery acid may leak out from the vent holes in the cell caps and pollute the environment.
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Battery support frame on the
side of the chassis - batteries arranged next to each other
Battery support frame on the
side of the chassis - batteries arranged on top of each other
Disconnecting
and reconnecting the batteries
| Risk of injury |
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There is a risk of
a short circuit if the positive terminal of the battery comes into contact with
vehicle parts when it is connected. This could cause the battery's highly
flammable gas mixture to ignite. This could result in serious injury to
yourself or others.
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Do not place any
metal objects or tools on the batteries.
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When disconnecting
batteries, always disconnect the negative terminal first and then the positive
terminal.
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When connecting
batteries, always connect the positive terminal first and then the negative
terminal.
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Never loosen or
disconnect the terminal clamps of the batteries when the engine is
running.
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Disconnecting
the batteries
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Vehicles with BlueTec® exhaust gas aftertreatment:
Disconnect the battery no sooner than five minutes after switching off the engine. This time is necessary to ensure correct operation of the exhaust gas aftertreatment system after reconnection.
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Original Element p durch Gültigkeiten gefiltert!
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Remove the vehicle
key from the ignition lock.
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Switch off all
electrical consumers.
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Open and remove the
battery cover.
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Disconnect the
negative terminals.
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Disconnect the
positive terminals.
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Reconnecting
the batteries
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Remove the vehicle
key from the ignition lock.
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Switch off all
electrical consumers.
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Connect the
positive terminals.
Do not interchange
the battery terminal clamps.
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Connect the
negative terminals.
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Refit the battery
cover.
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After an
interruption in power supply (e.g. after reconnecting the batteries) carry out
the following tasks:
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Set the clock
more.
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Deactivate the
anti-theft protection for the audio equipment (radio) (see the manufacturer's
operating instructions).
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Checking the
battery fluid level
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Check the battery fluid level every six months or at the latest after 50,000 km.
The fluid level in each battery cell must be approximately 15 mm above the top of the plate. Observe the minimum/maximum markings on the side of the battery casing.
Tap water reduces battery power output. Add only distilled or de-ionised water. Do not use a metal funnel when adding distilled water. There is a risk of a short circuit.
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| Risk of explosion |
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There is a risk of oxyhydrogen forming and the batteries exploding if the oxyhydrogen ignites. Avoid creating sparks. Do not allow naked flames near batteries. Do not smoke.
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Battery fluid level
(example)
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Observe the safety
instructionsmore.
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Remove battery
cover.
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On vehicles with
batteries arranged on top of each other, the batteries must be
removed.
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Unscrew the cell
cap.
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Check the battery
fluid level.
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Screw the cell caps
on again.
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Refit the battery
cover.
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Removing/installing batteries
(vehicles with batteries on top of each other)
| Risk of injury |
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Batteries are very heavy. When removing or installing a battery, you could drop the battery and injure yourself or others.
Be careful when removing the battery and ask another person to help you.
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Observe the safety
instructionsmore.
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Removing
batteries
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Only unscrew the
outer fixing bolts of the securing frame on the battery carrier when removing
the batteries. The inner bolts connect the parts of the securing frame and must
not be undone.
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| Fixing bolts |
| Securing
frame |
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Disconnect the
negative and positive terminals on both batteries
more.
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Unscrew fixing
bolts .
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Remove securing
frame .
|
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Remove the upper
battery.
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| Fixing bolts |
| Securing
frame |
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Fitting a
battery
| |
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The tightening torque of the fixing bolts is 20 Nm. Do not use an impact wrench.
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Battery care
| |
|
Please observe the following points:
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Dirty terminal clamps and battery surfaces cause leak currents, which lead to the batteries discharging. Always keep the terminal clamps and battery surfaces clean and dry. Lightly grease the terminal clamps, especially the undersides, with acid-resistant grease.
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Only clean batteries with the cell caps fitted; otherwise dirt can enter the battery cells.
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Cleaning agents containing fuel corrode the battery housing. Only clean the battery housing with commercially available cleaning agents.
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The vent holes of the cell caps must be open; otherwise, gases cannot escape. Clean blocked vent holes with a suitable tool, e.g. a piece of wire. Unscrew the cell caps first; otherwise there is the risk of a short circuit.
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If batteries which are not in use have a no-load voltage of less than 12.4 V, they must be recharged.
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Charging the
batteries
| Risk of explosion and injury |
|
Explosive oxyhydrogen is produced when batteries are being charged. Only charge the batteries in a well-ventilated area. Avoid creating sparks. Avoid fire, naked flames and do not smoke when handling batteries. Do not remove the battery charger terminal clamp until the battery charger is switched off and no more gas is escaping from the batteries. Ensure that the area is well ventilated when charging the battery.
Do not lean over the battery during the charging process and do not breathe in any gases; otherwise, you could be injured.
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Make sure that the charging voltage is correct. Use a commercially available battery charger to charge the batteries.
Do not rapid-charge new batteries.
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| |
Unscrew the cell
caps from the batteries.
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Disconnect the
battery terminals.more
Do not detach the
connecting cables between the batteries.
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Make sure that the
charging voltage is correct (12V or
24 V).
|
The charging
current must not exceed 10% (or a maximum of 75% for rapid charging) of the
battery's rated capacity.
| |
Follow the
operating instructions for the battery charger.
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Connect the battery
charger to the batteries in accordance with the manufacturer's operating
instructions.
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To achieve a long
service life, the batteries should always be adequately charged.
The charge status
of the batteries should be checked more frequently if the vehicle is used
mainly for short journeys or is left unused for long periods of time.
To ensure
continuous operational readiness, the batteries must be maintenance-charged if
the vehicle is out of use for extended periods.
