D15 I Hydraulic Pump Rebuild

Also, how the heck do I lower the pump from the housing? I got all the bolts out but the dang thang won't drop

Yes, the one in the torque tube. I will check those things.

There was very fine metal shavings in the fluid and on the plug magnet. Probably... Oh. If you turned one of those super small paper clips into metal dust. And it's more dust than shavings.

I have all the linkages the book is telling me to disconnect. And it looks like there's free space between the linkages levers and the pump. Where does the pump connect to the pipe/tube of the hydraulic system?

DrAllis wrote: You have to use a big flat blade screwdriver to compress the coil spring and shove a small nail in the hole on the rod to keep the spring compressed. Then, the pump can fall out.

Yup. Did that. Then removed the cotter pin connecting that rod to the traction booster linkage. the pipe on top of the torque tube?

The book says to remove a retaining ring? Do they mean the ring holding the traction booster lever/paddle?

You can just see the brass nail I used, and where I disconnected the linkage.

Yeah, I thought so, too.  It's been a loooooong time since I did one...

Do I just need to yank real hard?

Got it! Yes. You have to pull real hard

Now here's the million dollar question, do I take it ALL apart and clean everything, even the bits I didn't have problems with? Or should I only replace the two parts I know I had issues with?

Now that I know how to get it out it wasn't that hard and I'm not actually to scared if I'd have to do it again.

I have in my notes for my WD45 that .01 adds about 700PSI.
Seems I remember that the facotry shims were .01.

I don't see that in the service manual? AC-201?

I'm currently at 2500 with no shims, that's after fixing/replacing springs and the overload valve o-rings. So I should shoot for 0.06"+/-? That's a brand new overload spring. The valve itself looked fine, no obvious damage, didn't really Even see heat marks. So I'd rather try shims. But of each shim gives 125, the. I'd need 9 shims to get to pressure.

Allis dave wrote: I have in my notes for my WD45 that .01 adds about 700PSI. Seems I remember that the facotry shims were .01. I was working to get the pressure where I wanted it and adding a full .01 made the pressure too high. I ended up making a .015 shim form some shim stock to get where I wanted.

I think the WD45 had a different pump. But I have to make up almost 1000 PSI, so hopefully a small shim can do it.

Any flat washer could work. It's a matter of the thickness being right.

Sorry, more context.

I took a 3/8" stainless washer. 0.048" thick. Drilled out to 29/64". There WERE two shims already installed, for a total thickness of 0.06", plus my 0.048". (Basically added a shim and half).

I touched nothing else, this time I did very lightly tap the two balls into place for the relief and overload valves.

After reinstalling the pump the lift arms will only raise. I get better pressure, close to 3000. I'm not going to add more shims though until I can get it to work right AND still not have pressure.

I'm 90% sure I got the roller lever on the cover onto the relief on the spring. I have not hooked the linkage back up to the snapcoupler bell.

The traction booster arm keeps wanting to spring to the bottom of the quadrant.

I'm nearly certain it's something with the cover, but I'm struggling to visualize the issue or how to fix it between the manual and what I saw from having it apart.

DrAllis wrote: Traction Booster Linkage MUST BE CONNECTED AND ADJUSTED RIGHT OR THE ARMS WILL LIFT AND NOT LOWER !!!!

I'm do that doc, last time I installed and tested it worked fine without being hooked up.

Your first post said 2,000 psi peak. Now you have 2500 psi. Why don't you actually try and use the tractor and see what it will lift before yanking the pump back out. This test will also insure that the hold valve works and everything else is fine except max psi. Being low on peak pressure doesn't hurt anything as long as it picks up your biggest load.

Edited by DrAllis - 04 May 2024 at 7:07pm