Scout steering pump modification

[notaf-ingjeep]

I am having a hard time with this pump I have from a scout II. To start, I identified the ps pump that is on my cruiser already. It has to be a chev saginaw, it looks almost identical to the scout II pump. Except it has a larger pulley, and the output fitting is different. All the stuff I've looked seems to imply that the pressure regulator you want to modify is behind this output fitting. The pump that is on my cruiser looks like it may be in there. It looks like it would be integrated into the fitting and will fall out when you remove the fitting. I haven't torn it down yet, but I would guess it's in there.

This scout pump has a brass coupler pressed into the output port. It seals against the flared tube that is part of the actual fitting. The fitting it uses is nothing special and is exactly like what's on the box itself. I am not sure on how to actually modify this scout pump, as I can see no regulator to modify. However I can see that behind this pressed in brass coupler, there is a smaller hole a ways in there. I guess that is what I'd want to drill out? I don't know how best to get at it. This pump is a fresh rebuild I'd like to use it.

Anyone modified this scout pump? Can you give me an idea of how to get the pressure regulator out? I could use the chev pump that is on the cruiser if I have to. I do want to figure this scout pump out, and make it push out the extra psi's.

thanks guys

 

[bustanutley]

My recommendation is for you not to modify the pump. With hydro assist and a stock Saginaw pump you are going to have plenty of power. People have a lot of problems with steering pumps, and modifying them to produce more pressure shortens their life span.

 

[notaf-ingjeep]

I'll wait it out I guess, see how it works first. I knew this would be best, being a little paitient, I was just itching to modify it. I was thinking about the ram I'll be using as well. I will go with a 1.5" most likely, it will be more than enough power. I believe that it will be "faster" and steer quickly as less fluid will be needed. I thought if I got the pump pushing harder the 1.75" could work better in this respect.
I swear these rams have sky rocketed in price over the past few years. Back when I first became interested in building this kind of setup, a ram for $40-$60 was common. Given these were cheap rams back then, now I just can't seem to find them anymore. Now I'm thinking a Psc ram, they seem overpriced as do all of them. I'd like to see one in person first before I bought one, so I could judge the quality of them. Their boxes look pretty cool, with the PSC cnc engraved caps and all.

I would still like to figure this scout pump out. I'm thinking that I'll have to tear it down completely in order to get to the regulator. It appears to me that the "brass coupler" that is pressed into the port has the regulator built into it. This sealing coupler and the pressure regulator are one piece. It would have to come out from the inside, then drilled out. I found the website that this pump came from rebuilt, they are charging $100 bucks for it! I'm not gonna' just start tearing into it without having an idea of what I'm doing. I posted on Pirate in the harvester section of the B.B. as well. I found some past threads there discussing this, but the photos and links no longer any good. We'll see if I get any info there, you never know, they might be total dicks about it.

It seems strange that this Scout pump is so much different than the Chevy pump. I'm wondering which is best unmodified, and what is the major difference? The Chev has the larger pulley, this says to me that it will wind up at lower rpm's and produce more pressure there. I would have no idea what would differ other than that. I wonder why the pressure regulator is different, there has to be a reason. I think the guy who sold me the scout stuff said it was a lower pressure, higher volume pump. I might be mistaken about that, I can't remember, or vouch that he was a reliable source.

I built my self a pitman arm from one of the 2 scout arms I have. I made it almost straight, it has about 1/4" of drop maybe a hair more. It is about 7 3/4" long shortened from 9". I've seen guys run Chev arm on the scout steering box that is flat and 6" long. So mine is a little more off-road friendly as far as the length, and should give the box more leverage. I gave it one of the thickest, deepest, and most impressive Tig welds I've done.

 

[bustanutley]

Dude, you have got to take it easy on the meth...

 

[notaf-ingjeep]

Dude, you have got to take it easy on the meth...

I like to type too much!

 

[Dirtsquirt]

not exactly

The bigger pulley means slower rpm of the powersteering pump.
I think you will find if you change the pulley's from the scout to the chevy. It will deliver near the same volume as the scout.
As far as the pressure goes.. the chevy pressure regulator should be removable with ease. Do a google it a simple matter to shim the spring to up the pressure.
Stock pressure range on Chevy PS pumps is 800-1500 I wouldnt exceed the 1500 psi number
Good luck

 

[notaf-ingjeep]

Yeah the chev pump would be easy to modify, pull the output fitting and the regulator is behind it. It will just fall out and you drill it a little at a time until it's right. This scout pump is different, I don't know why.

I'm pretty sure that the regulator is part of the brass sealing coupler in this scout pump. To get it out and drill it, I'd have to tear the whole pump apart and knock it out to the inside. I'd almost bet it could just be removed and replaced by the same fitting and regulator that is on the Chev pump.

I got it clean and can see a small hole in the back of it, maybe a 1/16" hole. I'd say that is what regulates the pressure. I can't be sure about that though, I guess I will not worry about it. It is a good pump (scout) to have as a spare. I'll use the Chev pump, modify it if I need to. Like I've said I don't want to tear it apart without some verification of what I'll be getting into.

thanks