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Evinrude 70hp Trim Sender Arm

M

mlwright

New member
I recently purchased a 88 whaler with 1988 70hp Evinrude, thought trim gauge was bad but traced back to sender and found the real issue. The trim sender arm does not move up and down as the motor does. There must be a bracket or apparatus missing that the arm travels on. Purchased a manual but unfortunately only shows an exploded view of sender and how to replace, not what that arm travels on. So bought a new arm hoping mine was missing something but it is identical. Leads me to believe something is missing from the motor as it pivots. I move the arm manually and the gauge works so everything there is fine, there is something physically missing .Can someone please help?
 
Thanks for the quick reply. I do have the spring #105. It sits on the sending unit in between the body of the sending unit and arm #106 and appears to be maybe a tension or return spring. It does not extend the arm #106 further or connect to the swivel bracket #1. My thought is there needs to be something that connect the arm #106 to the swivel bracket #1
 
Looking at my motor I do not see anything that resembles #107. According the parts schematic it requires two, could those be the limit points that move as housing does and engage the arm?
 
#107 are just connector pins. Does the arm reach into the curve of the bracket?
It will only follow the bracket in the trim section and beginning of the tilt. After that, it will be 'free'.
 
I see what you are talking about now, thank you. I assumed that arm followed the motor throught out the range of motion. Yes the arm does reach into the curve and I just got the gauge to register after manually pushing arm into curve with my finger. That would leave me to belive that the spring itself may be bad or the sending unit is bad as the arm is very stiff and does not return to it's original position on it's own once the motor is in the down position.

The sending unit is discontinued, any additonal thoughts on what I can do to loosen up that arm so that it returns to original position. I will order a spring but it appears this one has good tension just the arm itself is too stiff for it.
 
I had the same problem with my 1989 60hp Johnson. The trim sender arm was stiff and additionally, the potentiometer inside had a crack on the resistor track. Well, the sending unit is discontinued, the potentiometer (Rockwell Automation) either. So i scratched out all the silicone and replaced the potentiometer with a 4 Watts 500 Ohms wire wound type with a 6mm shaft. (a 1/4" shaft would be even better, but hard to get in Germany). Only the track from 0 Ohms to 94 Ohms (up -> down) is used. So I had to file a notch the right place on the shaft to get the arm to the correct angle referred to the potentiometer. With the arm and spring mounted, the potentiomenter is mounted in that position that the resistance is just moving away from 0 Ohms (I chose 1 Ohm). Then I taped the potentiometer to prevent silicone to enter and filled the housing with new silicone again.
 
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