371
TRIM AND TILT
ELECTRICAL CIRCUIT TESTS
13
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.
Monitor motor RPM and current draw.
The motor shaft must rotate clockwise, as viewed
from the pump end, when positive (+) is applied to
the blue lead, and negative (–) is connected to
green lead.
The motor shaft must rotate counterclockwise, as
viewed from the pump end, when positive (+) is
applied to the green lead, and negative (–) is
applied to the blue lead.
If test results vary, replace the motor.
30957
DR4238r
Green lead (+)
Blue lead (-)
Blue lead (+)
Green lead (-)
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