Optional
Trolling
Slip Valve
All reverse gears that are available for the D5/D7
engines can be fitted with a trolling valve so that the
lowest speed of the boat can be variably reduced by
1–80% at engine speeds up to 1100 rpm.
IMPORTANT!
Risk of overheating the reverse gear if the trolling valve
is used at higher engine speeds than 1100 rpm.
Maneuvering
Disengage the reverse gear and set the trolling valve
for maximum slip. Engage “Forward” or “Reverse” and
set the desired slip position within the permitted engine
speed range. In order to attain full propeller output, the
trolling valve lever must always be in “disengaged”
position when not being used.
Propeller Shaft Brake
In certain operational circumstances, the propeller
may cause the propeller shaft to rotate when the
engine is stopped. This passive rotation is
uncomfortable and can be harmful to the reversing
gear as its oil pump, which is driven by the input shaft,
will not operate when the engine is stopped.
The propeller shaft may be allowed to rotate with a
stopped engine for up to 6–8 hours. After this, the
engine must be started and run for at least five minutes
for lubrication and cooling of the reversing gear.
In cases where the propeller shaft may rotate faster
than in normal operations, e.g. boat under sail, a
temperature gauge should be installed for monitoring
the oil temperature.
Max. permissible temperature for ZF reversing gears
is 95°C (203°F).
When the above-mentioned regulations cannot be
met, or when the shaft needs to be stopped for reasons
of comfort, a shaft brake must be fitted. On isolated
occasions, the propeller shaft flange may be locked in
a suitable manner instead.
47713336 03-2021 © AB VOLVO PENTA 25
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