Jump-starting, tow-starting and towing away 333 X Unscrew cover ; from jump-starting socket : . spring-loaded parking brake cylinder manually. X Connect a jump lead. Make sure that the lug fits in the recess. R The brake system and gearshift are with- out compressed-air supply if the vehicle is being towed away. The transmission lubrication system does not function and there is a risk of transmission damage. Observe the "Towing vehicles with engine switched off" section. X Donor vehicle: start the engine and run it at a high speed. X Vehicle being jump-started: start the engine and leave it running at idling speed. X Donor vehicle:
switch off the engine and turn the key back fully in the ignition lock. ! Route cables and compressed-air lines so that they can accommodate movements without strain, kinks or friction when turn- ing corners, etc. X Both vehicles: remove the jump lead. X Screw cover ; onto jump-starting socket : . Note that steering movements require con- siderably more force at a standstill than when the vehicle is moving. Avoid steering move- ments when at a standstill, particularly when the front axle is under heavy load. If you transport the vehicle on a low-loader, the permissible vehicle height may be excee- ded. Pay attention to the headroom clearance of buildings, e.g. bridges.
Before towing, agree on a clear signal with the towing vehicle driver. Both you and the towing vehicle driver must adapt your driving styles to the more difficult conditions. If the compressed-air brake system cannot be charged, the spring-loaded parking brake cyl- inders can be released manually ( Y page 335). X Fit battery compartment cover = ( Y page 307). Breakdown assistance Manoeuvring/tow-starting and tow- ing away Important safety notes G WARNING If the engine is not running, the power steer- ing and the compressed-air supply are inop- erative. You then need to steer considerably more forcefully.
The spring-loaded parking brake cylinder can be activated if there is a loss of compressed air and the vehicle may then brake uncontrollably. This could cause you to lose control of the vehicle. There is a risk of an accident. Always use a tow bar. Always ensure the compressed-air supply using an external compressed-air source. Specialist knowledge beyond the scope of these Operating Instructions is required for tow-starting and towing away. Only have your vehicle tow-started/towed away by a profes- sional towing/recovery company. Further information can be obtained from a Mercedes-Benz Service Centre. Notes on tow-starting and towing away !
If the engine is not running, observe the following when manoeuvring, tow-starting and towing away: R If the engine is not running and the spring-loaded parking brake cylinder is activated as a result of a loss of compressed air, the brakes may over- heat and be damaged. Charge the compressed-air system or release the Z