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Was the trim fluid level low when you first checked it?
Release the manual release valve, Turn it out a couple turns. Pull up on the engine all the way. Turn the release valve in, put the trailer leg down. Let it sit for a couple minutes, now check the fluid level. If the fluid level is OK then trim the unit all the way down. Trim up and see how far you get, pull up on the lower unit at the same time, does it go up further?
Is the titl tube where it swivels in the front of the engine greased and free?
The trim fluid has to be added when the unit is fully tilted. From your description it is a little low on fluid. The trim has two circuits the trim circuit and the tilt circuit. Your trim circuit seems to be working but the tilt is leaking down. Stuck check valve, leaking manual relief, or low on fluid.
How is the fluid level when fully tilted?
Are there any messages you sent that are not on the screen?
Is the trim portion working but not the tilt range?
Can you get me the serial number of the engine?
Air in system, defective component.
Remove the E ring then the manual relief valve. Allow the trim fluid to drain into a clean container. When drained check the fluid, is there shavings, black specs, debris in the fluid?
Check the O rings on the valve, all of them must be in perfect condition, if rough or cut it will allow fluid to bypass. Are all the O rings intact and there? I've seen them break and stay in the unit.
Check these and let me know what you find.
Refill and flush and replace those O rings. Do you have any experience with hydraulics, or intricate repairs if we need to go further?
If you need I can get you the repair manual for the trim.
More than likely one of the check valves is open, probably from hitting something in the past. I'm going to attach the chapter on the trim. This should get you where you need to be.
Download the file from here;
Certainly not a common problem, probably from hitting something. Lots of Luck, let me know if I can help further.