Power Steering pump

[adamsclarke]

Anyone know how much PSI a J truck pump puts out? I am looking for a larger flow pump for my commando since I am putting hydroboost in.
Looking for at least 1500 PSI...???

[Elliott]

Between 1,100 and 1,300 psi. You can go to a yard and pull the pressure relief valve from your era specific pump (flared fitting or metric o-ring). You will want it from a one ton dually rig with HB and it should be close to 1,500 psi.
I don't know what the hydroboosted Astro relief were rated at, been thinking of pulling one down to measure against a H1 valve and a dually valve.

[Hammer]

Elliot, that would be good idea (and something NICE to add to your 'kit' to make it simple for people).
Either way, that sounds like a SIMPLE way to make the pressure mods, rather then pulling it apart and 'guessing' when making other mods.

Btw, do you know the flow rates for those dually rigs?

[Elliott]

I believe the duallys are 1500psi but that's from what I've read somewhere, 1300-1500 might be more realistic. I've actually considered buying the gauges to check this stuff out as they aren't too darn expensive.
The Astro relief valve if it is higher than 1100 psi would just be a pita to get at quickly enough to make it worth my time to grab. Much easier to pull one off a dually pump where it's right there in your face.
When I get time I'll pull the three apart and do some measuring and compare to the dimensions posted on the "how to" directions for modifying a valve that is on POR IIRC.

[Hammer]

Yeah, that would good info!
I will be going the HB on my chero in the near future.
And will most likely do hydrualic assist as well (I already have the gearbox sitting, along with hoses etc. Just need a different ram, as mine is a little too big/slow).
So I am on the fence on whether or not to mod my pump, or just buy one that I know will work.

[elbastardo]

I talked to a guy a while ago that rebuilt HB units, and he mentioned that all the newer heavier duty trucks F250s 3500s and so on, were all running 1500lb pumps to acomodate for the bigger breaks, bigger tires, bigger loads and so on. Regretably im not sure what years to look for. Ill try and find the site.

Btw Elliott can you get the seals at the rod end, mines leaking into the cab.......allot (that guy that i talked to wont sell me parts, he rebuilds them only)

[Hammer]

Another nice thing about running the entire pump/cannister from a chevy with HB is that they already have the 2nd return port in them.
They don't clock in the same as the amc version, but it isn't too hard to adapt them in. Can't remember what it took, I haven't looked at that setup for a while now.

[Elliott]

Btw Elliott can you get the seals at the rod end, mines leaking into the cab.......allot (that guy that i talked to wont sell me parts, he rebuilds them only)

Not sure what HB you got, but on 99% of the units out there if you have one where the rod is held into the piston assembly with a crimp you are screwed. You can buy seal kits and I can give you a link, they cost ~$50 but you will not be able to replace those seals at the back of the unit without being able to remove the rod to take the unit apart.
Maybe you think you are good enough at aneeling to heat the crimp, pull the unit apart and be able to recrimp assembly without cracking it but... if it cracks later while you are using your brakes it might not be worth the trouble. Even the rebuilders screw that part up fairly regularly from what I read...:thumbsup:

http://www.fullsizejeeps.com/gallery/albums/userpics/10016/HB_Pedal_Rod_O-rings.JPG

[Elliott]

Another nice thing about running the entire pump/cannister from a chevy with HB is that they already have the 2nd return port in them.
They don't clock in the same as the amc version, but it isn't too hard to adapt them in. Can't remember what it took, I haven't looked at that setup for a while now.

Some of those cans adapt easier than others, like the ham can with side entry return probably fits right in, I think Thomas did that'n.

I fit a round can and had to modify the bracket and assembly as well as work with return lines to fit together before I decided I now want to drop the whole unit further down the block as the pump sits pretty high (even with my 3" body lift) on an AMC for running a remote cannister with this res:
http://www.fullsizejeeps.com/gallery/albums/userpics/10016/DCP_3669%28Small%29.JPG
http://www.fullsizejeeps.com/gallery/albums/userpics/10016/DCP_3678%28Small%29.JPG
http://www.fullsizejeeps.com/gallery/albums/userpics/10016/DCP_3679%28Small%29.JPG