372
TRIM AND TILT
ELECTRICAL CIRCUIT TESTS
Connect a 0 to 100 A DC ammeter in series
between the battery side of the starter solenoid
and the red lead to the trim/tilt relay module.
Observe ammeter and a stopwatch while running
hydraulic unit through several complete cycles.
Compare test results to the values listed:
Three piston system
Single piston system
Test results include three basic possibilities:
A. Low current draw – Check for:
• Valves leaking
• Relief valve springs weak
• Pump damaged
• O-rings leaking
• Check valves fouled or damaged
• Manual release valve damaged
B. High current draw – Check for:
• Pump binding
• Motor binding
• Cylinder binding
• Valves sticking
C. Normal current draw, slow operating
speed – Check for:
• Impact valves damaged
• Check valve or shuttle valve malfunctioning
• Manual release valve damaged
Trim and Tilt Motor No Load Test
IMPORTANT: Securely fasten motor in a suit-
able fixture before proceeding with this test.
Use a battery rated at 360 CCA (50 Ah) or higher
that is in good condition and fully charged to per-
form this test.
Connect a 0 to 50 A ammeter in series with the
battery positive (+) terminal, ammeter red lead
toward battery.
Attach or hold a vibration or mechanical tachome-
ter to the motor while performing this test.
1. Red lead 005441
Mode
Normal
Current Draw
Time in
Seconds
Trim-OUT (Trim range) 22 A 9
Tilt-UP Stall 60 to 75 A N/A
Trim-IN (Trim range) 16 A 9
Trim-IN Stall 35 to 45 A N/A
Mode
Normal
Current Draw
Time in
Seconds
Full Range UP <30 A 12-18
Full Range DOWN <30 A <18
Stall <40 A –
1
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