Power Steering Pump Pressure

luvrbus · February 19, 2020, 06:17:29 AM

Anyone know the operating PSI for a MCI C-3 power steering (Ross) 1500 psi doesn't sound right to me

richard5933 · February 19, 2020, 07:48:36 AM

That's the pressure for my '74 GM 4108, so it's certainly within the realms of reality.
Aren't the pressures in the MCI manual like in the GM?

luvrbus · February 19, 2020, 08:14:52 AM

Quote from: richard5933 on February 19, 2020, 07:48:36 AM
That's the pressure for my '74 GM 4108, so it's certainly within the realms of reality.
Aren't the pressures in the MCI manual like in the GM?

If I had a C-3 manual I would not be asking when I updated the power steering on my MCI 8 it went from 1000 psi to 1850 psi my DL is 2250 psi I am trying to find out what a C-3 psi setting is because he can not turn the wheel unless it moving

Jim Blackwood · February 19, 2020, 08:25:56 AM

Don't know the spec for your rig, but on power steering in general it it tends to be a variable that can be fiddled with to get the results you need. The main limiting factor is the pressure side hose(s). As long as the rating on that is adequate you can go up to around 2500psi without worrying about it too much. Still and all it's probably best not to overdo it.

This became a big thing with so called monster trucks back when the craze was to fit 35" tires to pickups and other 4x4's. Suddenly the power steering wasn't up to the job. Those systems typically ran about 1100-1200psi but it was easy to fit a washer in behind the pressure relief and jack that up to about 1500psi which usually did the trick. A mod that was well worth doing and I never heard of anyone having a problem with the increased pressure. You might expect more pump wear but apparently it wasn't an issue.

Jim

luvrbus · February 19, 2020, 08:43:37 AM

You cannot shim the valve on the Vickers pull the pin and change the complete valve assembly for a 100 bucks Vickers has you by the balls on that one

TomC · February 19, 2020, 11:02:28 AM

When converting from air steering to Sheppard, the pump originally put out 1,500 which wasn't enough. Put in a 2,200 pump and worked great. Good Luck, TomC

Boomer · February 20, 2020, 11:42:27 AM

I sold cases of manuals from most every bus out there some time back. Cliff if you call J.D. at C&J he will probably know the answer right off the top of his head. Good luck reaching anybody who knows anything at MCI.

luvrbus · February 20, 2020, 07:32:47 PM

Quote from: Boomer on February 20, 2020, 11:42:27 AM
I sold cases of manuals from most every bus out there some time back. Cliff if you call J.D. at C&J he will probably know the answer right off the top of his head. Good luck reaching anybody who knows anything at MCI.

How did you sell your manuals I need to sell my library lol I was giving them away till I gave a guy all my old GM manuals that was supposed to make files for every one to use "FREE" lol the last I saw the 25 or so manuals he was selling them on Ebay

Scott & Heather · February 20, 2020, 08:12:13 PM

In other news, I was in the process of flipping my vickers pump vane and had a kid crisis and can't remember which direction it was. I think it's right and installed the pump but if I'm wrong am I going to ruin something?

luvrbus · February 21, 2020, 07:27:30 AM

Won't hurt the pump only your feelings will be hurt,lol I have flipped the pump before and assembled it back the same way as it was

Scott & Heather · February 21, 2020, 09:25:20 AM

Lol. Good to know even the pros make mistakes lol.

Boomer · February 22, 2020, 10:14:24 AM

Cliff I sold them to Stan Holter, they have a huge library of everything. I had all the MCI, GM, Eagle,Prevost, Crown, Detroit, Allison, etc. Still have some Prevost, Detroit, Allison, Cat 1693, and an Eagle 15, and the Eagle Premier A/C manual.

luvrbus · February 22, 2020, 01:17:52 PM

Quote from: Boomer on February 22, 2020, 10:14:24 AM
Cliff I sold them to Stan Holter, they have a huge library of everything. I had all the MCI, GM, Eagle,Prevost, Crown, Detroit, Allison, etc. Still have some Prevost, Detroit, Allison, Cat 1693, and an Eagle 15, and the Eagle Premier A/C manual.

I may give Stan a call I have a huge selection for the older stuff and a lot for the later model electronic engines and transmissions, turbos, injection,electrical,gearing you name it.I would like to see mine go someplace where they could be used since I have so many rare manuals. I am not really interested in the money I would rather see the manuals used in some way

6805eagleguy · February 22, 2020, 02:55:02 PM

Clifford, I need airline schematics for my 68 05 eagle.

Something you would have?

luvrbus · February 22, 2020, 03:46:24 PM

Quote from: 6805eagleguy on February 22, 2020, 02:55:02 PM
Clifford, I need airline schematics for my 68 05 eagle.

Something you would have?

I do but if you do F/B they have a lot of schematics for Eagles check out Vintage Bus Mechanics ( not the same as Grease Monkey) and Eagle Owners if they are not posted they will send you one Steve is good about that