add hydraulic control valve to manual steering box to get hydro-assist? - Pirate4x4.Com : 4x4 and Off-Road Forum
 
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Old 04-13-2011, 02:39 PM   #1 (permalink)
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add hydraulic control valve to steering shaft to get hydro-assist?

Wondering if it would be possible to install something like the control valves that Howe uses with their racks with a manual steering box. Splice it into the steering shaft and then hook it up to a pump and ram. Goal would be to add hydro-assist to a vehicle without having to replace the stock manual steering box. Called Howe to ask, but Jeff just left and won't be back in the shop until next Monday.
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Old 04-13-2011, 03:09 PM   #2 (permalink)
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I believe the old dodge trucks did something similar to this. let me see if I can find a picture for you.
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Old 04-13-2011, 05:12 PM   #3 (permalink)
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Yes, its called a servo.

Sweet is one brand. http://www.sweetmfg.biz/products2.asp?edit_id=33
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Old 04-13-2011, 05:28 PM   #4 (permalink)
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Thanks for the link.
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Old 04-13-2011, 05:39 PM   #5 (permalink)
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look for pics of baja racing cars

in class 5 / 1600
class1/2 / 1600
class 14
class 15
class 9
trophy trucks
class 7

they use this kind of valves so they could have power steering
they dont use a ram, they put in howe steering boxes like
http://www.offroadwarehouse.com/prod...roductID/40624

let me see if i could take som pics of a friends race car
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Old 04-13-2011, 05:59 PM   #6 (permalink)
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Right, that's where I saw them. Just never thought about adding power to a manual box that way.
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Old 04-13-2011, 06:06 PM   #7 (permalink)
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I have been thinking about doing this for a while using a Sweet MFG setup. My thought was that maybe using this you could get a higher flow to the ram than running it through the box and you might be able to run a larger ram without the slow steering feel. But I haven't looked that far into it and I have no clue if it will work. But I am glad to see a thread about it.
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Old 04-28-2011, 10:10 AM   #8 (permalink)
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maybe its the cobwebs in my head this morning, but I am not seeing how this sets up.

A regular engine driven power steering pump assists you by pushing the pitman arm instead of relying simply on a mechanical connection like many old trucks and SUVs.

A hydro assist taps an engine driven PS pump and some fluid is diverted to a cylinder which pushes the drag link, but there is still a mechanical connection to the steering, which full hydro removes.

Link posted by Miguel seems to show a ram or rack of sorts with a pump, a filter and maybe a servo?? Looks to me like hydro steering, but he says they dont use a ram, so a hydro "rack" maybe?

TIA for clarification...

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Old 04-28-2011, 10:24 AM   #9 (permalink)
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Yeah, power-assisted racks just have the hydro ram built into them.
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