Adjusting trim pump pressure
09-11-2005 | 07:26 PM
#11
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From: Hudson River, NY
Re: Adjusting trim pump pressure
Originally Posted by Falcon
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
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
09-11-2005 | 10:19 PM
#12
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From: Wisconsin
Re: Adjusting trim pump pressure
You turn it in to increase the spring tension on the ball and seat. Sorry if I sounded like I doubted the connections, just double checking. I have run into a few on drives and tabs hooked up wrong. Tabs are the confusing ones, you do hook them up "backwards"! The high pressure port is marked UP, same as on drives, so it should be hooked up to the port to push down on the tab!
09-11-2005 | 10:31 PM
#13
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From: Hudson River, NY
Re: Adjusting trim pump pressure
Originally Posted by Falcon
You turn it in to increase the spring tension on the ball and seat. Sorry if I sounded like I doubted the connections, just double checking. I have run into a few on drives and tabs hooked up wrong. Tabs are the confusing ones, you do hook them up "backwards"! The high pressure port is marked UP, same as on drives, so it should be hooked up to the port to push down on the tab!
Any idea how much the pressure might increase per 360* revolution? Supposedly its set at 1600psi now and I want to increase to 2000psi give or take.
09-11-2005 | 11:08 PM
#14
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From: Wisconsin
Re: Adjusting trim pump pressure
That's the problem with this adjustment, it's only a guess unless you have the right equipment. I don't really know, but it's pretty tough to go too high unless your cylinders won't handle the extra pressure. I would carefully turn it in until it bottoms, counting the turns in until it bottoms (don't force it at the bottom, you could hurt the spring, ball, or seat). Then make sure you are backed off at least 1/2 or more turns. I think the Bravo pumps are set to about 2400 psi. Hey there's an idea, temporarily try a Bravo drive pump if it's convenient to see if it's enough to lift the hatch!
09-12-2005 | 07:42 AM
#15
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From: Providence,RI
Re: Adjusting trim pump pressure
I realize these pumps are different. However there principals are the same.
Make small moves.
Here is a very infomative link. I adjusted mine with this info.
My application is much different.
I was able to raise the pressure.!
http://www.offshoreonly.com/forums/s...+pump+pressure
Good Luck
Gerry
Make small moves.
Here is a very infomative link. I adjusted mine with this info.
My application is much different.
I was able to raise the pressure.!
http://www.offshoreonly.com/forums/s...+pump+pressure
Good Luck
Gerry
09-17-2005 | 08:06 PM
#17
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Posts: 615
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From: Hudson River, NY
Re: Adjusting trim pump pressure
Originally Posted by caveman
I realize these pumps are different. However there principals are the same.
Make small moves.
Here is a very infomative link. I adjusted mine with this info.
My application is much different.
I was able to raise the pressure.!
http://www.offshoreonly.com/forums/s...+pump+pressure
Good Luck
Gerry
Make small moves.
Here is a very infomative link. I adjusted mine with this info.
My application is much different.
I was able to raise the pressure.!
http://www.offshoreonly.com/forums/s...+pump+pressure
Good Luck
Gerry
I adjusted the pressure up. All I had to do was turn the up side pressure bolt in the oil tank 1 1/2 turns in and the problem is gone. Thanks again for the thread pointer.
