Mercury Mariner 30/40 4-Stroke Outboard Service Manual 1998, Page 286Get this manual

Mercury Mariner 30/40 4-Stroke Outboard Service Manual 1998, Page 286

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POWER TRIM
While operating "up" circuit, the cylinder rod will continu to tilt the outboard to full up posi tion for trailering
Tilting Outboard Up and Down Manually
Before loosening