1987 Johnson/Evinrude CU Outboards 35A thru 55 Service Manual, Page 310Get this manual
Use the following guide to interpret the current draw readingsThis, together with the symptoms listed in Trouble Check Chart should help pinpoint the problem 1Normal Current DrawNormal maximum current draw in the full up or full down mode indicates the hydraulic pump-motor combination and relief valves are functioning to specificationsThe problem is elsewhere, such as in the: aPump Control piston bCheck valves cMechanical binding 2Low Current DrawLower then maximum current draw in the full up or full down mode generally indicates: abcdLeaking valvesWeak relief valvesPoor pump performanceLeaking a-rings on valve bodies 3High Current DrawHigher than maximum current draw in either the full up or full down mode indicates: aElectric motor malfunctioning electrically or mechanicallyRemove motor and check for bindingCheck no load current drawbPump bindingPump should turn with 0,25 Nm (2.25 in.lbscRelief valves not opening at correct pressure