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Power steering pump

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Foz

02-14-2003 20:08:46




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Any of you have an idea as to bout how much pressure and flow a power steering pump off of a chebby pickup would have? Been thinking of some projects to build with one as the pump source .Have any of you built a project useing one?




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the tractor vet

02-17-2003 17:36:15




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 Re: Power steering pump in reply to Foz, 02-14-2003 20:08:46  
Back when i was a ford tech now this is way back the test pressure on the releif was set at 2250 lbs. and that was on the 68 thru 70 and i can not remember for sure but i think it was around 3.5 gph.



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Scott Green

02-16-2003 18:38:57




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 Re: Power steering pump in reply to Foz, 02-14-2003 20:08:46  
I bought a tractor years ago. It had a front hydraulic lift for a blade. It was powered by a power stearing pump , fit to the PTO of the tractor. The town used it to plow snow.



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Paul Janke

02-16-2003 08:33:39




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 Re: Power steering pump in reply to Foz, 02-14-2003 20:08:46  
Power steering pumps have a built in pressure relief and a priority flow divider. The flow divider is to give you the output you need when you are at an idle (like when you are parking) but not too much when the engine is running fast. It is possible to disassemble the pump and to bypass these valves. How hard it is to do that varies from one pump to another. If the pressure relief is bypassed, then some external pressure relief should be installed to prevent damage to the pump. I have gotten over 3000 lb pressure from a GM pump from the early 50's. Higher pressure will make it harder to not slip the belt, but that is sometimes not too much trouble, especially if the original system ran over three pulleys and the new is a two pulley system. The higher flow from disarming the priority flow divider doesn't cause increased belt load because the pump was still pumping the same amount of oil. The flow divider just dumps the extra oil but at high pressure, so the power which was being consumed but not used is turned into heat. High pressures for the majority of the time will cause the pump to wear out sooner than it would on power steering, because those pumps are designed to spend most of the time at low pressure. If the pump is cheap and if it is easy to get another, wearing it out won't be a problem. Many hydraulic systems are used at low pressure for most of the time.

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Russ

02-16-2003 06:12:07




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 Re: Power steering pump in reply to Foz, 02-14-2003 20:08:46  
I used an old chrysler unit once, about 800 psi at 2 gpm. could get more gpm with smaller sheave but it would be hard to get much pressure without the belt slipping.



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mj

02-15-2003 20:26:53




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 Re: Power steering pump in reply to Foz, 02-14-2003 20:08:46  
Did you see the Mother Earth News article where a guy built a dump bed for his 3/4 ton Chevy and ran the hoist off the powersteering pump? I think he had a valve under the hood to switch from steering to dumping so he only needed one pump. Seems like the article was about 10 years ago.....I think they even made some separate plans available later on.



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Gary

02-15-2003 17:59:43




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 Re: Power steering pump in reply to Foz, 02-14-2003 20:08:46  
I've got an old Massey Harris 333 with a bad engine. I also had a junked out forlift and I bought a wrecked, nearly new (at that time, 20 yearsago) Plymouth slant six with automatic. I mounted the engine and transmission in one day, mounted the forklift masts in about two days, laid the steering shaft across the floor board of the tractor, ran a chain from it to the steering shaft from a cottonpicker. I mounted the forklift hydraulic tank right behind the reversed seat, ran a large hose to the filler spout on the power steering pump and have picked up and loaded complete cars with it. I mounted the counterweight from the forklift laying down under the belly of the tractor.With the tractor transmission in reverse and the auto in drive, the brakes won't hold it, even idled down to a slow idle. It was fun to build and is still a conversation piece.

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Got a picture of that contraption for us?

02-16-2003 20:39:02




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 Re: Re: Power steering pump in reply to Gary, 02-15-2003 17:59:43  
Got a picture of that contraption for us?



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RayP(MI)

02-15-2003 16:27:53




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 Re: Power steering pump in reply to Foz, 02-14-2003 20:08:46  
Know of a fellow who had one rigged up to run the hydraulic cylinders on his snowplow on his 4wd pickup. Wish I'd have thought of that before I spent the $ to buy a electric/hydraulic unit. His lifted and turned about as fast as mine.



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Paul Janke

02-15-2003 06:41:58




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 Re: Power steering pump in reply to Foz, 02-14-2003 20:08:46  
Dealer service departments can tell you if they want to hunt for the information. My 1988 Ford is about 1.5 GPM at 1500 PSI if I remember correctly. I use my power steering to run a dump box hoist on the pickup and on a trailer.



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mj

02-15-2003 09:14:35




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 Re: Re: Power steering pump in reply to Paul Janke, 02-15-2003 06:41:58  
Hmmm.....guess I will be using Ford pumps instead of the GM units.....MORE POWER!!!



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mj

02-14-2003 21:28:53




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 Re: Power steering pump in reply to Foz, 02-14-2003 20:08:46  
About 900psi.



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moonlite

02-16-2003 07:01:52




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 Re: Re: Power steering pump in reply to mj, 02-14-2003 21:28:53  
There must be some provision in a PS pump to have a near constant volume regardless of the RPM. Just wonder how this is achieved. Are any modifications heeded to make it usable as a tractor hydraulic pump?



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Kelvin

02-15-2003 16:07:41




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 Re: Re: Power steering pump in reply to mj, 02-14-2003 21:28:53  
I was thinking P.S. pumps built in the 70's relief kicked open at 1100-1150.



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mj

02-15-2003 20:07:21




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 Re: Re: Re: Power steering pump in reply to Kelvin, 02-15-2003 16:07:41  
You're probably right . I should have given the range (instead of an average) I remembered from whatever article it was that detailed the pressures for various GM models. I remember the low being around 800 and the high about 1050 psi. It seems as though the heavier, bigger engined and/or 'sport' suspension got pumps with bigger reservoirs and more pressure...know anything about that? I'm going to look through some of my stuff and see if I can find that article.....I think it was written in late '60s or early '70s.

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Burrhead

02-15-2003 20:51:26




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 Re: Re: Re: Re: Power steering pump in reply to mj, 02-15-2003 20:07:21  
The warning label on one of the Ford F150 at the farm says 1200 psi. I can't find it in the manuals yet.

I know using one of the Ford pumps with a 1hp electric motor driving it will warp the boom on a 1 ton engine cherry picker



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DaveCA

02-16-2003 14:52:13




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 Re: Re: Re: Re: Re: Power steering pump in reply to Burrhead, 02-15-2003 20:51:26  
It helps quit a bit if you unbolt the motor mounts before ya lift the motor.



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Burrhead

02-17-2003 19:31:43




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 Re: Re: Re: Re: Re: Re: Power steering pump in reply to DaveCA, 02-16-2003 14:52:13  
LMAO. I was'nt lifting an engine when it buckled.



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DaveCA

02-18-2003 05:50:43




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 Re: Re: Re: Re: Re: Re: Re: Power steering pump in reply to Burrhead, 02-17-2003 19:31:43  
You didn't let a li'l thing like that stop ya from usin' it did ya?



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MPK

02-16-2003 04:41:22




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 Re: Re: Re: Re: Re: Power steering pump in reply to Burrhead, 02-15-2003 20:51:26  
I have a GM pump on a press I built with a 6 inch hyd cyl. I had it looked up and it was around 1200 lbs.



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RB/CT

02-16-2003 18:00:35




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 Re: Re: Re: Re: Re: Re: Power steering pump in reply to MPK, 02-16-2003 04:41:22  
1971 Chevrolet Manual says 850 to 1000 pounds. Just a thought, but if I used one, I would buy a rebuilt at Auto Zone, with a limited lifetime warranty, so if it goes, you can get another for free. (only once though, hence the Limited Lifetime warranty.)



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RB/CT

02-16-2003 18:00:34




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 Re: Re: Re: Re: Re: Re: Power steering pump in reply to MPK, 02-16-2003 04:41:22  
1971 Chevrolet Manual says 850 to 1000 pounds. Just a thought, but if I used one, I would buy a rebuilt at Auto Zone, with a limited lifetime warranty, so if it goes, you can get another for free. (only once though, hence the Limited Lifetime warranty.)



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