55
Hydraulic retarder together with manual gearbox:
Besides a 0-position, the hand control has a further five po-
sitions Position 1 is ”cruise position”.
Explanation, see below. In positions 2–5, 25%, 50%, 75%
and 100% of the retarder’s braking capacity will be utilized
respectively. Foot control is also engaged in stages provid-
ing 25%, 50% and 75% braking capacity. Maximum braking
capacity is therefore greatest using the hand control.
This retarder has integrated (”cruise control”) that interacts
with the engine control system. If the retarder’s hand control
is moved to position 1, the bus will retain its current speed
when the accelerator pedal is released. The same also ap-
plies when the brake pedal or clutch pedal is released. I.e.
cruise control is activated at the new increased speed when
the accelerator pedal is released after overtaking or the
new reduced speed when the brake pedal is released after
braking.
Unlike ”normal” cruise control systems that work only
through the engine management system, this cruise control
system also activates the retarder. The bus will therefore not
roll faster downhill when cruise control is active.
Fault indication
The following applies only to the separate hydraulic retard-
er together with manual gearboxes.
If the green retarder lamp goes on continuously when the
retarder is not being used (flashes if overheated), this will
indicate a fault in the retarder. Depending on how serious
the fault is, the result may be that the retarder works at re-
duced effect or not at all. Contact a Volvo workshop for diag-
nosis and repair.
Retarder hand control
Disengaged
”Cruise position”
(separate hydraulic
retarder only)
25% output
50% output
75% output
100% output
Retarder indicator light
Driving
Summary of Contents for B10M
Page 1: ...Driver s Manual...
Page 6: ...4 Pay attention to warning and indicator lights Their purpose is to warn of danger...
Page 131: ...129 TechnicalData Type plates 130 Specifications Data 132...
Page 142: ...140 Notes...
Page 143: ...141 Notes...
Page 144: ...142 Notes...
Page 145: ...143 Notes...
Page 146: ...144 Notes...
Page 147: ...3 Notes...