Best of : Power steering pump modifications ( pressure and flow )

[frostytj]

Bumping this back up.

In doing some looking through pictures at www.cardone.com I ran across this which looks like the a 185 pump. Problem is I can not find it online based on the part number. I havent contacted cardone about it but seeing how I can find say 20904 it leads me to believe it might not be made anymore.

Anyone know anything about cardone part numbers? This pump is 20903. Anyone know if 207903 is the same pump but with a reservoir? Anyone know a source for the 185 pumps?



Edit: Post #56 shows what I think is the same pump from Napa but the number is obsolete. Looks like some more searching is in order.

[Zr2x350]

Originally Posted by oldtimingman

Well finally .....Works great! Using Amzoil Tractor /Hyd fluid. Runs COOOOL! You can almost stick your finger in the reservoir after locked up crawling! ALMOST! Locked up with 39.5 TSLs hooked up a GM 2WD truck box....this was an old used one. Don't know what pressure it puts out but NO COMPLAINTS!......DID I mention CHEAP! Fawk a bunch of fancy pancy pump high dollar $$$ pumps that crap out and leave ya stranded.......But it"ll take ingenious bastards to fit it under the hood !

Does anyone know how this ended up turning out ultimately?

[jstarnes]

Originally Posted by Zr2x350

Does anyone know how this ended up turning out ultimately?

????? fluid wise???

I started using 0W20 fully synthetic engine oil in my system... I will say I have a special reservoir design though.....

[bigburby]

For anyone interested in pump mods here is some basics for understanding hydraulics. First very important thing to note is that pumps pump flow not pressure. raising a pumps bypass pressure only increases the maximum amount of resistance in the system to high and your pump breaks. Second is that if you have to match flow for your system to much without a bypass and you will have failure even with a bypass you generate unnecessary heat. Drilling out the return line or increasing the return of a pump reduces the chance of a pump caviatating (small bubbles are released and dissolved in whatever you are pumping causing damage) the flow control can be modified to provide more flow instead of recirculating it to reservoir.
Flow at idle can only be changed by having a larger displacement pump or changing pulley ratio for a faster pump rpm at idle. Most powersteering pumps are vane types and and reach flow contol at approx 2000 engine rpm.
Hope this helps understanding hydraulics also milwright manuals and hydraulics manuals can provide with much information on troubleshooting hyraulics.

[Krod]

Originally Posted by bigburby

For anyone interested in pump mods here is some basics for understanding hydraulics. First very important thing to note is that pumps pump flow not pressure. raising a pumps bypass pressure only increases the maximum amount of resistance in the system to high and your pump breaks. Second is that if you have to match flow for your system to much without a bypass and you will have failure even with a bypass you generate unnecessary heat. Drilling out the return line or increasing the return of a pump reduces the chance of a pump caviatating (small bubbles are released and dissolved in whatever you are pumping causing damage) the flow control can be modified to provide more flow instead of recirculating it to reservoir.
Flow at idle can only be changed by having a larger displacement pump or changing pulley ratio for a faster pump rpm at idle. Most powersteering pumps are vane types and and reach flow contol at approx 2000 engine rpm.
Hope this helps understanding hydraulics also milwright manuals and hydraulics manuals can provide with much information on troubleshooting hyraulics.

What exactly from that makes anyone understand basic hydraulics??

[Rinkrat456]

Originally Posted by spaggyroe

Maybe a "more knowledgeable" parts store such as Napa would have more info?

Don't mind if I do.

http://pirate4x4.com/forum/showthread.php?t=951326

[bigburby]

Originally Posted by Krod

What exactly from that makes anyone understand basic hydraulics??

Not knowing what you are trying to accomplish when increasing flow rates and pressure will cause ultimatly needless and expensive repairs. pumps pump fluid at a rate regardless of obstructions in a system if the only place you have issues with a system for example is at idle then modifying the flow control will not increase that. positive displacement vane pumps which the large majority of power steering pumps are put out a volume of ci/rev more revs more gpm up to the pumps max rpm. so if you make a modification to increase the output of a flow control valve from 3 to 5gpm for example as well as increase the bypass pressure in a system that is designed for 3 gpm math tells you 2 gpm will have to go somewhere resulting in excesive heat generation at a minimum or worst case blowing hydraulic lines, split cylinders or a destroyed pump. a better option may be overdriving the pump to get a desireable flow rate at idle considering your enge rpm range or if you lack power in the system increase bypass pressure as long as you do not exceed the limits of your hoses pump etc. hydraulics have to be matched for your flow rates if you are trying to build a system you need too know the volume of your pump the volume of your cylinders the output of a charlyn valve in ci/rev if you want to predict turns lock to lock. giving someone a example to randomly modify items with out understanding the consequenses is irresponsible.

[masonmachines]

Why do people bother modifying OEM pumps to the point of failure, when they could run a pump like this? 10 gpm for $150 is pretty good?

[mj]

there is more to a steering pump then just a pump.
you linked to a pump, no relief valves or anything
so you would have to add a lot more $$ to make that work

[patooyee]

Originally Posted by masonmachines

Why do people bother modifying OEM pumps to the point of failure, when they could run a pump like this? 10 gpm for $150 is pretty good?

/forum/general-4x4-discussion/724253-why-dont-we-use-these-instead-ps-pumps.html

[masonmachines]

I remember that thread but did not read the whole thing. What was the final consensus?

[jeepgif]

I am still looking for the ever elusive P185 pump.

This is the info I get when I search for : 97-99 chevy Medium Duty trucks with a 6.5 diesel.

1998 Chevrolet Chevrolet C-Series Medium Duty Truck C6/C7/C8 | Kodiak, TopKick C-Series Service Manual | Steering | Power Steering System | Description and Operation | Document ID: 221060
________________________________________
Power Steering Pump Description
These vehicles use the following four models of steering pumps:
• The Hobourn 205 pump
• The Hobourn BB135 pump
• The Hobourn S600 pump
• The Saginaw 235 pump
The various pumps use both remote and integral reservoirs.
Some vehicles have an aluminum power steering fluid cooler pipe mounted in front of the radiator, behind the grille panel. The cooler pipe is held in place by clamps.



GM PN 26003161, or 26016420 ACDelco # 36-0007

I find no refrence to a P185 pump that fits the standard enclosure.

[jeepgif]

Anyone have access to a Delphi catalog? Check to see if this is a 185 series pump.

Delphi PN 26012268
Interchange Part Number: RE33717

Engine: 460 v8, 185 series, 3.7/4.1 GPM


Was listed for a John Deere Motorhome.?

[TBItoy]

What type/kind of pump does KRC use? They seem to particularly popular around here.
Cast Iron Pumps


Isuzu Rodeos have the same kind of pump, along with other brands

1994 ISUZU RODEO Power Steering Pump

Looks like it could be modded to the same as the KRC pump

[AgitatedPancake]

Definately subscribed to this one, I want to replace my jeep's pump with something higher pressure and flow. Rockauto is a great resource for this subject as they have pictures for most of the products.

Is there any common conversion between the pumps that have the 3 bolt holes on a circle like jeeps, and the 4 bolt pattern I'm seeing here? Might have to make some bracketry...

[78stepsideUAK10]

My pump took a dump, anyone find a part number on a 185 pump yet, I know someone that works at a gm dealership at the parts desk

I'll have him look up the part numbers posted