Mercury 35/40HP 2 Cylinder Outboards Service Manual PN 90-42794--1, Page 310Get this manual
Maintenance Normal ServiceEvery 50 hrsof operation or 60 days (whichever comes first) Severe ServiceEvery 25 hrsof operation or 30 days (which ever comes first) Operation in salt water area is considered "Severe Service"1Carefully check steering system components for wearReplace worn parts2Check steering system fasteners to be sure that they are torqued to correct specificationsNOTE: Ride Guide steering cable is lubricated at the factory and requires no additional lubrication at initial installation
AWARNING
After installation is complete (and before operating engine), check that boat will turn to right when steering wheel is turned right and that steering can be executed thru full range (left and right) at all tilt angles to assure interference-free movement
Maintenance Instructions
Maintenance inspection is owner's responsibility and must be performed at intervals specifiedNormal ServiceEvery 50 hrsof operation or 60 days (whichever comes first) Severe ServiceEvery 25 hrsof operation or 30 days (whichever comes first)