7.4.4.1 Enabling Troll
Press and hold the Transfer Button for two seconds with the Control Head lever in the Neutral detent
• The Control Head’s red LED should begin blinking rapidly, indicating that troll is enabled.
• If not, refer to Section Section 5.7.2.1.1: Function Code L0 – Troll Enable and Control Head
Lever Troll Range.
7.4.4.2 Troll Minimum Pressure Adjustment (Function Code L2)
A Ensure that the Control Head lever is at the Neutral / Idle position.
B If the red LED is blinking rapidly, disable Troll by pressing the Transfer Button until the red
LED becomes lit solid.
C Connect a Service Field Test Unit (P/N 14000) and Ammeter to the Troll Command Signal
output as described in the MM13927 Field Service Test Unit Reference Manual.
D Move the Control Head lever to the Ahead detent.
E Using a Shaft Tach, measure the RPM of the Shaft and record.
F Depress and hold (approximately 2 seconds) the Transfer Button until the red LED starts
blinking rapidly.
G Measure the Shaft RPM and record.
H Adjust the Value of Function Code L2 until the Shaft RPM is 30 to 50% of that measured in
step E.
I Enter the new Value into memory.
J If twin screw application, repeat steps A through H on the opposite side.
7.4.4.3 Troll Maximum Pressure Adjustment (Function Code L3)
A Place one Control Head lever in the Ahead detent with Troll enabled.
B If twin screw, ensure that the opposite lever is at the Neutral/ Idle position.
C Scroll to Function Code L3 and enter Setup Mode as described in Section Section 5.7.2.1.6:
Function Code L3 – Solenoid Troll Maximum Pressure.
D Increase or decrease the Value until the Shaft RPM is 70 to 80% of that measured in step E
of Section Section 7.4.4.2: Troll Minimum Pressure Adjustment (Function Code L2).
E Enter the new Value into memory.
F If twin screw, repeat steps A through E on the opposite side.
NOTE: Do Not attempt the following adjustments until the Gear oil temperature has reached a minimum of 140
degrees F (60 degrees C).
NOTE: The effects of the following adjustments are not immediate. Allow enough time for the Shaft RPM to
stabilize between any changes to the L2 and L3 Values.
NOTE: Adjust the Value of L2 based on the desired vessels water speed or shaft RPM. Do not base the
adjustment on the response time (how quickly or slowly the shaft begins to rotate after shifting from Neutral
to Ahead or Astern). The response time may be adjusted later with Function Codes L5 and L6.
NOTE: On Twin Screw applications, the Troll Minimum and Troll Maximum pressure adjustments should be
done one side at a time initially. Once each Trolling Valve has been adjusted individually, they must be
operated as a pair and adjusted further, as necessary.
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