8
ZF PADOVA
MECHANICAL TROLLING VALVE (M.T.V.)
The trolling valve is a device that allows the number of propeller revolutions to be changed independen-
tly of the engine running speed. The M.T.V. is usually applied in the following circumstances:
1) when the boat speed is too high, even though the engine is idling.
2) when the rotation speed of the PTO must be greater than the propeller rotation speed.
The M.T.V. can be used in both drive directions and the maximum running speeds are:
- Maximum rotation speed = (max engine speed x 0.5) rpm, for engines with maximum running
speeds less than 2000 rpm.
- Maximum rotation speed = (1000) rpm, for engines with maximum running speeds greater than
2000 rpm.
Use instructions
Check that the M.T.V. is deselected before engaging the gear. After engaging the gear, gradually move
the M.T.V. lever until the desired manoeuvre speed is reached.
When operating with trolling valve, the number of revolutions can be changed within the limits given
above.
It is forbidden to reverse the drive when
the M.T.V. is engaged.
Fig. 8
CLUTCH
SLIP
CLUTCH
PRESSURE
15
15=pressure-gauge
connection
ELECTRIC TROLLING VALVE (E.T.V.)
This is an electrical device that has the same functions and is used in the same way as the M.T.V.
The E.T.V. operates via a proportional solenoid valve.
Actual propeller speed can be 30 - 70 % lower than propeller speed capacity,depending on gear box
reduction ratio, propeller size and boat characteristics.
We recommend a range of use : 60 - 80 °C.
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