Anyone know how to adjust a trim pumps pressure? I have a set of dana Power hatch hinges that use a trim pump and they can't lift the hatch after installing a new mirror over the engine. I sent them back to dana for a pressure increase, but it seems they didn't do anything. I don't want to get into the story, I just want the hatch to open without my help.

Are you sure you are using the high pressure side of the pump? Just a thought

What kind of pumps are you using?

http://www.danamarineproducts.com/Di...TOKEN=63928498

here is the link

Dave,

I thought you were having good luck with those lifts. I was thinking about switching over to them this winter. Maybe not now... I cant believe that the added weight of a mirror will stop them from lifting the hatch.. After all, our size boats have a relatively small hatch when compared to larger boats. What gives here?

Vinny,

With my hatch including the back seat it’s a good 250Ibs. That’s quite a bit heavier than most hatches I've seen. The setup is very slick, and I highly recommend it if your hatch isn't extremely heavy.

Come to think of it no. Are they marked? I'd rather not spill more oil just to swap it and find out it's not the issue.

are they using olidyne pumps????

Ok they are hooked up correctly. They are marked. The pump is part number 865380A13 same as any bravo trim pump. No one knows how to adjust the pressure up?

Here is a parts diagram of the pump.
http://www.mercruiserparts.com/Show_...tor+Components

It isn't easy to do a measured change in pressure. You have to remove the reservoir loosen the locknut on the correct pressure valve and turn in the valve to increase the pressure. It's not shown in the diagram, 812498A1. It's the one under the same side of the pump that the UP connection is on. There are 3 valves; UP, DN, and a 3rd one that is in a different location, the thermal relief.
Are you sure the "UP" port (high pressure) is connected to the end of the cylinder that extends the cylinder (piston end)? The output pressure of these pumps should be high enough to lift a hatch on the high pressure side. Is there too much air in the system? Hold the hatch up and disconnect the cylinder. Run it in and out a few times. Any better? I normally don't just connect a pump to an empty cylinder. I leave the DN side plug in the pump, connect the UP to the cylinder (drive, tab, lift ram, etc.) with the cylinder in the fully compressed position. Remove any cap or plug on the rod side to allow the cylinder to extend (if there is oil in the cylinder, aim it into an open container). Run the pump to extend the cylinder. Now connect the other side of the pump to the cylinder. Very little air should remain.

Hope this helps!
Good luck