Page 358 - REPOWER REFERENCE GUIDE (2020)

Instrumentation and Controls

! WARNING

Excessive trim can cause serious injury or death at high speeds, and single‑ram trim systems do not provide a trim‑out
limiting device or trim indicator. Use caution when trimming with a single‑ram trim system and never trim out beyond the unit's
side support flanges while the boat is underway or at engine speeds above 1200 RPM.

The trimming drive unit UP/OUT can:
• Generally increase top speed
• Increase clearance over submerged objects or a shallow bottom
• Cause the boat to decelerate and plane off slower
• In excess, cause boat "porpoising" (bouncing) or propeller ventilation
• Cause engine overheating if trimmed UP/OUT to a point where any cooling water intake holes are above the waterline
The trimming drive unit DOWN/IN can:
• Help the boat accelerate and plane off quicker
• Generally improve the ride in choppy water
• In most cases, reduce boat speed
• If in excess, lower the bow of some boats to a point at which they begin to plow with their bow in the water while on plane.
This can result in an unexpected turn in either direction called "bow steering" or "oversteering" if any turn is attempted, or if
a significant wave is encountered.
Connections

a a - Control harness
b - Trim pump connector
b

7699

a - Trim limit/sender harness terminal lead
b b - Terminal connector block
c - Retaining clip
d - Locking tab
d

d c

a

11912

Page 9D-14 © 2019 Mercury Marine 90-8M0149179 eng NOVEMBER 2018