1988 Johnson/Evinrude "CC" 40 thru 55 Models Service Manual, Page 308Get this manual
UNITWILL RAISE ONLY PARTWAY 1Check oil level UNIT WILL NOT HOLD IN TILT POSITION 1Relief valve in tilt cylinder bad 2Tilt piston O-ring bad 3Pump check valve bad LEAKS DOWN IN TRIM ANGE 1Check manual release valve 2Check for line leaks 3Check stem valve and relief valve in tilt cylinder 4Check for worn O-rings in trim and tilt cylinders 5Check pump check valve LEAKS DOWN IN TILT RANGE ONLY 1Check manual release valve 2Check for line leaks 3Check relief valve in tilt cvlinder 4Check for excessive wear in tilt cylinder 5Check pump check valve LEAKS DOWN ALL THE WAY FROM TILT TO TRIM IN POSITION 1Check for oil leaks 2Check valve in pump 3Check manual release valve UNIT WILL NOT TRIM OUT UNDER FULL POWER 1Check oil level 2Check for line leaks 3Check battery and wiring connections 4If unit still does not trim out, change pump UNIT VERY SLOW TO TRIM OUT 1Check oil level 2Check battery charge 3Check motor armature and brush wear GAUGE DOES NOT WORK 1Check wiring connections 2Check for bare wire grounding 3Check fuse on main fuse panel 4Check for bad spring in tilt cylinder GAUGE VERY ERRATIC 1Check wiring connections 2Check for weak sender spring 3Check for bad ground springs 4Check for loose sending unit windings Troubleshooting With Pressure Tester The OMC Trim and Tilt Pressure Tester PIN 395415 provides method of checking for hydraulic leakage of valves and sealsOne gauge is used for pressure measurement in the "up" mode of operation and the other gauge is used for "down" operationMeasurements can be made with the unit mounted either on the motor or on the bench45C o Qj