Evinrude & Johnson E75DPLSCB, Service Manual

Page: 292 / 349

290
TRIM AND TILT
ELECTRICAL CIRCUIT TESTS
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. 135 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
hydraulic tests. DO NOT attempt to perform the
following tests while the boat is moving.
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:
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
1. Red lead 005441
Mode
Normal
Current Draw
Time in
Seconds
Full Range UP <30 A 12-18
Full Range DOWN <30 A <18
Stall <40 A –
1