Section 3 - On the Water
90-866938081 MAY 2009 Page 73
PROCEDURE FOR A STUCK TRIM TAB CONTROL VALVE
1. Determine the drive that is not responding to trim control.
2. Shut down the engine and turn the key switch off. Wait at least 30 seconds, if
possible.
3. Restart the engine. Confirm the trim tab fault has cleared.
4. If the trim tab fault did not clear, repeat the start/stop routine up to three times.
5. If the trim tab fault does not clear using the above procedure, then shift the transmission
into neutral, shut down the engine, turn the key switch off, and alternately push the
trim‑up and trim‑down manual‑override buttons to release the spool. Refer to the decal
on the manifold bracket or on the port‑side of the drive cover, if equipped, for additional
information.
6. Restart the engine. At the helm, trim the tab up and down to confirm the fault has
cleared. If the Tab_Spool_Stuck fault remains, then shut down the engine and turn the
key switch off on the unresponsive drive. Operate on another engine and drive. Refer
to Port Engine Only Operation, if the starboard drive is shut down.
NOTE: Boat speed and maneuverability will be reduced. Oversteer or boat listing may
occur with tab in the down position.
End of First Season Checkup
At the end of the first season of operation, contact an Authorized Cummins MerCruiser
Diesel Repair Facility to discuss or perform scheduled maintenance items. See Section
5 if you are in an area where the product is operated continuously, year‑round, contact
your Authorized Cummins MerCruiser Diesel Repair Facility at the end of the first 500 hours
of operation or once yearly, whichever occurs first.
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