Retarder Overheating - Volvo 9700 US/CAN 2016 Driver's Handbook Manual

Retarder overheating

Note: Only apply, if the coach equipped with
the hydraulic retarder.
If the retarder remains engaged for a long
time (e.g. during a long downhill stretch)
it may be overheat, causing an increase in
retarder oil temperature.
The first indication of retarder overheating
is the "CHECK" lamp lighting and the
temperature symbol showing up on the
display. If this happens, select a lower gear
and make greater use of the main brakes.
If the temperature continues to rise, the red
"STOP" lamp will light and there will be an
increase in the temperature accompanying
the symbol on the display. Stop the bus as
soon as possible and select neutral, i.e. N. To
increase the circulation of the coolant run the
engine at higher idle until the temperature
returns to the normal level.
CAUTION
Do not switch off the engine before the
temperature is back to normal. Failure to
do so may be result in component damage.
Instruments and controls 61
CHECK icon lit in the dashboard.
Symbol shown in the driver display.
STOP icon lit in the dashboard.
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