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Tow-starting
97
Tow-starting
Guidelines for Breakdown Services (Subject to technical modifications)
i
General
Preparations for tow-starting
왘
Turn vehicle key in steering lock to drive position.
The indicator lamps should light up. If the indicator lamps do not light up, the vehicle cannot be tow-started.
왘
Deactivate acceleration skid control (ASR).
왘
In vehicles used to transport hazardous goods, check that the EMERGENCY OFF switches are deactivated,
see page 60.
왘
Check compressed air supply. The STOP lamp must not light up. If the display shows
Œ
, the system must
be filled from an external source, see page 81.
Risk of accident
G
• If the reservoir pressure in the compressed air system is too low or nonexistent (STOP lamp lights up
below 6.8 bar), there will not be adequate braking effect. The clutch booster and gearshift system may be
inoperative depending on the pressure level.
• If possible, fill the compressed air system from an external source before tow-starting, see page 81.
• If the engine is not running, only tow-start the vehicle on a straight stretch of road (no power steering).
• Only use a tow bar.
• Risk of skidding on wet or slippery roads.
• Do not tow-start in the reversing direction with reverse gear engaged.
• If spring-loaded brake cylinders have been mechanically released, the parking brake is inoperative.
• Do not tow-start if there is engine, transmission, transfer case, axle or steering damage.
• Only tow-start the vehicle with the batteries connected.
Risk of accident
G
When tow-starting, the retarder in the vehicle may perform uncontrolled braking actions.
Switch off the retarder before tow-starting. If necessary, use the service brake to brake the vehicle while tow-
starting.
!
If the maximum permissible engine speed is exceeded, the warning buzzer sounds. Select a higher moving-
off gear or reduce the towing speed.
Vehicles with automatic transmission cannot be tow-started.
If the display shows
Œ
, reliable gearchanges cannot be guaranteed.
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