296
Trim and Tilt
Troubleshooting
Troubleshooting
Use the following guidelines to check a single pis-
ton trim/tilt unit that is not working correctly.
Cylinder Leakdown:
• Manual release valve seals
• External leaks
No reverse lock:
• External leaks
No operation, motor runs:
• Manual release valve open
• Fluid level low
• Pump coupler
• Hydraulic pump
No tilt down:
• Manual release valve
• Fluid level
Slow performance:
• Manual release valve
• Fluid level low
• Mechanical binding
• Electric motor
• Hydraulic pump
Unit locked in tilt up:
• Mechanical binding
• Hydraulic pump
Electrical Circuit Tests
Relay Testing
When the trim-UP button is pressed, the UP relay
is energized and connects the blue trim motor wire
to the battery positive (+) terminal. The green trim
motor wire remains grounded. When the button is
released, the blue trim motor wire returns to a
grounded position.
When the trim-DOWN button is pressed, the
DOWN relay is energized and connects the green
trim motor wire to the battery positive (+) terminal.
The blue motor wire remains grounded. When the
button is released, the green trim motor wire
returns to a grounded position.
Refer to Tilt/trim Relay Test on p. 112 for relay
testing procedure.
Trim and Tilt Motor
Current Draw Tests
Careful analysis of the electric motor's current
draw and trim/tilt unit operating speed aids evalu-
ation of the electric motor and certain mechanical
components.
Use a battery rated at 360 CCA (50 Ah) or higher
that is in good condition and fully charged to per-
form this test.
IMPORTANT: Specifications are for static hy-
draulic tests. DO NOT attempt to perform the fol-
lowing tests while the boat is moving.
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