ZF 335 Family Manual De Instrucciones página 9

The gearbox must be filled with oil and the oil level checked before use. (see MAINTENANCE section).
Using the gearbox with insufficient oil could damage the gears.
Too much oil could cause leakages through the gaskets and breather and considerably increase the
running temperature.
Under normal conditions, the drive should be reversed when the engine is idling.
In emergencies, the drive can be reversed with the engine running at maximum speed.
Repeatedly reversing the drive with the engine running at maximum speed will considerably
shorten the life of the clutches
Make sure the engine and propeller are at a standstill before carrying out any kind of operation
on the gearbox.
MECHANICAL TROLLING VALVE (M.T.V.)
The trolling valve is a mechanical device that allows the number of propeller revolutions to be chan-
ged independently of the engine running speed. The M.T.V. is usually applied in the following circum-
stances:
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
- Maximum rotation speed = (1000) rpm, for engines with maximum running speeds greater than
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.
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 gearbox
reduction ratio, propeller size and boat characteristics.
We recommend a range of use: 60÷80°C.
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speeds less than 2000 rpm.
2000 rpm.
15 = pressure-gauge
connection
15
Fig. 5
9
GB
CLUTCH
SLIP
CLUTCH
PRESSURE