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Page 63
20. TROLLING VALVE CONTROL
20.1 PURPOSE OF A TROLLING VALVE
A Trolling Valve will allow a boat to move more slowly with
the clutch fully engaged, at IDLE speed.
A Trolling Valve is a bolt on addition to some hydraulic marine
reverse-reduction gears. The purpose is to reduce the
hydraulic clutch pressure to a point that allows the clutch to
slip, and therefore the propeller to turn more slowly than IDLE
speed lock-up. The engine RPM must not exceed 1000 RPM in
Trolling Mode, as the heat build up can cause damage to the
transmission.
20.2 MICROCOMMANDER CONTROL OPERATION
The existing MicroCommander control lever operating speed
and direction will now, in addition, operate the trolling valve
lever.
When in Troll Mode, the MicroCommander control lever can be
placed in the 'AHEAD' detent and the trolling valve lever will
move to maximum slip position (approximately 70% slip).
Continued control lever movement in the AHEAD direction
thru the next 15E or 25E , will leave the engine at IDLE RPM,
the transmission lever in ahead, and troll lever moving thru
the slip range from maximum slip (approximately 70% slip) to
minimum slip (approximately 30% slip). Continued
movement 'AHEAD' of the MicroCommander control lever will
move the Troll lever to lock-up position and begin to increase
engine speed. The remaining movement of the
MicroCommander control lever 'AHEAD' will increase engine
speed up to full speed. Movement of the MicroCommander
control lever back to 'NEUTRAL' will reverse the steps outlined
above.
Operation in 'ASTERN' is the same as 'AHEAD', but in the
‘ASTERN’ direction.
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