Mercury Optimax Models 135, 150, Direct Fuel Injection., Page 316Get this manual
POWER TRIM
Troubleshooting
IMPORTANT: Determine if Electrical or Hydraulic problem existsIMPORTANT: Acceptable power trim leak down should not exceed in(25.4 mm) (when measured at the tilt ram) in 24 hour period
HYDRAULIC SYSTEM TROUBLESHOOTING
IMPORTANT: Make one correction at timeCheck operation of trim system before proceeding to the next checkCONDITION OF TRIM SYSTEM ABCDEFGHIJKLTrim motor runs; trim system does not move up or downDoes not trim full downUp trim OKDoes not trim full upDown trim OKPartial or "Jerky" downup"Thump" noise when shiftingDoes not trim under loadDoes not hold trim position under loadTrail out when backing off from high speedLeaks down and does not hold trimTrim motor working hard and trims slow up and downTrims up very slowStarts to trim up from full down position when "IN" trim button is depressedPROBLEM 1, 2, 5, 10 2, 3, 1, 1, 2, 3, 6, 5, 8, 9,10 2, 5, 3, 2, 5, 8, 1, 2, 8, 3, 3, 4