1996 120 Force Tilt/Trim question

JFoshee

Seaman Apprentice
Joined
Sep 15, 2009
Messages
46
The trim would not work up at all, but it would begin to pull down. It would not pull down to the point I couldn't hold it with my hands. I removed the pump/cylinder from the motor and began to take it apart. The hex shaft from the motor to the pump was fine. I then pulled the block that houses the pump and springs off. I removed it in a mannor that all the springs and check balls stayed in tact. The pump looked ok. I found that the plastic valve that you turn to release the psi so the engine can be lifted or lowered manually had the tip broken off inside. I got this out, but my question is: Is the pump supposed to work with this tip broken off? I reassembled everything and I can spin the pump with my drill, but I don't notice any fluid coming from the ports. I am somewhat familier with hydraulics, but I don't understand how this works or where each port goes. I can see the rocker on top of the block switch one way, but it dosen't want to switch the other way when I reverse the direction with my drill. I do not have a manual and I know this would probably answer my question, but I do not plan on keeping the engine and it seams to run fine. So I was hoping to get out of buying one. Any ideas? I will try to post a pic of the plastic piece after while, but have already assembled the rest of the unit so I can't take pics of the other parts. I hope I have made it clear what parts I am talking about.
 

RRitt

Captain
Joined
Mar 30, 2006
Messages
3,319
Re: 1996 120 Force Tilt/Trim question

you have to get tip out of aluminum without making any scratches. you have to flush thoroughly. rocker arms pumps like to get debris wedged inside and then never work again. So flush, flush, flush. all three orings on the release valve are critical. your system will not work if any of them are missing or damaged.
 

JFoshee

Seaman Apprentice
Joined
Sep 15, 2009
Messages
46
Re: 1996 120 Force Tilt/Trim question

I put my new piece in yesterday, but it did not fix my problem. I can turn the pump with my drill and make the ram go in, but when I change directions it won't even try to start going back up. I can seperate the cylinder from the pump assembly and blow in the cylinder and make it go in or out although it is tight. It cannot be moved by hand. When I turn the pump with my drill it looks like oil comes from both holes, the up and down and not at the same time, but when coupled back together with the cylinder it will only go down. Is there a check valve that holds the cylinder in the up position until there is pressure in the down positin to release it? I am taking the pump apart again today to see if I can see anything wrong. I will spray carb cleaner through each orifice and maybe this will help. Also, while turning with my drill I can remove the fill plug and see the rocker arms, but they do not shift when I go from forward to reverse on my drill. I can work them manually and they do not feel stuck. Are these what changes the flow from up to down? What makes the shift? I assume the change in direction of the pump, but do both sides of the pump have a suction and discharge? What does the piece do that fits in the cylinder with the o-ring? I removed it last time and there is what appears to be a check valve and spring behind it, but it looked fine. Sorry for so many questions, but I need to get this working again.
 

RRitt

Captain
Joined
Mar 30, 2006
Messages
3,319
Re: 1996 120 Force Tilt/Trim question

There are many possible problems. When I rebuild that type system I don't even look for specific problems. The single ram system can end up being a game of whack-a-mole and the time you save on one system will be lost tenfold on another. In the end it's fastest to either do nothing or do everything. It sounds like you still have a piece of debris in the manifold. Get a little LED light on goosneck and stick it up inside the manifold. It's probably either jammed up behind the spool valve or down where the tip of the release was at.
 

JFoshee

Seaman Apprentice
Joined
Sep 15, 2009
Messages
46
Re: 1996 120 Force Tilt/Trim question

I finally fixed it. I completely disassembled it today. Blew carb cleaner through each hole followed by air then cleaned each piece before putting it back together. I believe one of the pistons was stuck. It was a little hard to get out, but did not looked scratched. Also, on the piece that has the three o-rings that goes into the cylinder, one of the o-rings was off. Thanks for all the help.
 
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