Stand-alone tilt/trim pump

[BrianVT]

I'm not sure if this pump is specific to Mercury or is generic since it's on board and not on the engine. It runs to a 1980's 70hp Mecury outboard.
The pump motor still runs but I started having no trim/tilt and no reverse lock (related?). There is some clear oil on the floor under the pump. I'm hoping I can just add oil as needed to finish what's left of the Maine, USA boating season and fix it properly after I pull the boat out of the water for the season. There is no oil tank to fill. There is a knurled bolt that seems like it might be where oil would be added? (see arrow in first picture)
Advice on adding oil as needed and also a proper fix, please?
I will get some absorbent pads to contain the oil and keep it out of the bilge and lake.
I found 1 pic online that looks similar to my pump but is a better picture than I could get (attached). Maybe that will help.

 

[Alumarine]

In the picture of the other pump on the right hand side just below the large red electrical plug is a slotted machine screw.
That's the fill plug.
If clear oil came out of it put 10W-30 motor oil in it.

They're not generic.
They're used in older Mercury outboards and I think all Mercruiser stern drives.

 

[BrianVT]

Thank you.
Would the low fluid also cause the reverse lock to not be working?
I just noticed the sticker below the fill plug in that picture. Is says to fill to bottom of the threads with the engine tilted up. How to tilt the engine up? Will I be able to tilt it up by hand, and then lock it, with the boat in the water?

 

[Chris1956]

Turn the knurled knob full CCW, with the motor down. Now fill the pump reservoir, as Alumarine described. Now see if she will trim up.

On those older motors, with the original PTT control panel, you need to push 2 buttons at the same time for tilt to work.

On the bottom of the PTT pump/reservoir is a control valve. It has 4 orings and a plate, connecting it to the pump/reservoir. The pump often leaks there. The top of the pump/reservoir attached to the base with screws and a gasket. Make sure those are tight, or it will leak there.

 

[BrianVT]

Thank you.
So...turn full CCW (if it's not already), fill to bottom of threads, replace fill screw, leave knob at full CCW, and try the tilt up button. Correct?
Then check fluid level at full up?
Then leave the knob at full CCW while boating?

I don't know about the 2 buttons you mention. I only know of the up/dn thumb button on the fwd/reverse control.

I did look into the seals. Looks like four 021 o-rings. Not sure which material to get. Buna-N?

 

[Chris1956]

yes on all points. The original control panel had a separate trailer button. I guess your trim limit switch was bypassed over the years, allowing the use of 2 buttons. That's fine.

I wouldn't worry about the oring material. They were likely rubber in the 80's and lasted 40 years. The control valve will mold 2 into oblong shapes, for some reason.

 

[BrianVT]

Thanks again.

 

[1960 Starflite]

Brian, Would you post a picture of cylinder (s) I have a pump system I'd like to modify for my 1975 85hp outboard

 

[BrianVT]

Brian, Would you post a picture of cylinder (s) I have a pump system I'd like to modify for my 1975 85hp outboard

I assume you mean the lift cylinders on the engine.
My boat is in the water so I'd have to hold my phone out over the water. Not sure I want to do that but I will see what I can do next time I'm down there.

 

[1960 Starflite]

Thanks, understood

 

[BrianVT]

On the bottom of the PTT pump/reservoir is a control valve. It has 4 orings and a plate, connecting it to the pump/reservoir. The pump often leaks there. The top of the pump/reservoir attached to the base with screws and a gasket. Make sure those are tight, or it will leak there.

Things have just thawed out here and I'm finally looking at this pump.
I wanted to search for an exploded view but there are no readable markings so I don't know what to search for.
Where should I be digging to get at these Orings?

 

[Chris1956]

The control valve bolts thru the plate to the reservoir body. Simply remove those bolts and the control valve, with the hoses attached will come off, exposing the plate and it's 4 orings, 2 on each side of the plate.

 

[BrianVT]

Thanks for the reply.
Do you mean these bolts?

 

[merc850]

Before you tear it apart here are the bleeding instructions for the rams (some of them have a 3/16" Allen screw) I would do this first:

 

[Chris1956]

Gee, you are asking a lot for me to ID the bolts from the picture. The bolts are obvious, as they are the only ones visible.

 

[BrianVT]

So I replaced the four O-rings with Quicksilver part # 25-48171.
Only 1 of the old ones looked bad.
It still leaks. (see video)
What to do now? Or might I have the wrong O-rings? (edit: I rechecked and it looks like correct O-rings)
Also, on the other half of the assembly, the part that the bolts go through, there were grooves that had black in them that looked like they might also be O-rings? They were odd shaped grooves. Not all circles like the ones I replaced. But the leak is on the side of the plate that I replaced the o-rings.

 

[BrianVT]

Brian, Would you post a picture of cylinder (s) I have a pump system I'd like to modify for my 1975 85hp outboard

Do you still want these pics.?

 

[merc850]

Thanks, understood

Do you want the manual installation guide?

 

[1960 Starflite]

Thanks for asking, I've abandoned my project.

 

[BrianVT]

The control valve bolts thru the plate to the reservoir body. Simply remove those bolts and the control valve, with the hoses attached will come off, exposing the plate and it's 4 orings, 2 on each side of the plate.

I just read this one again.
When I took the bolts out I looked at the top of the control valve and the ports? had odd shaped grooves around them (diamonds, etc). I looked at the bottom of the reservoir body and it had 4 round grooves with o-rings. So I replaced those 4. And it appears to be leaking between the plate and the reservoir body.
But your post says, "...2 on each side of the plate."
Is this where I went wrong? I replaced 4 on one side of the plate.