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Re: Big Bolt Power Steering
Spartan #1306667 Thu Apr 11 2019 12:07 AM
Joined: May 2017
Posts: 344
S
Shop Shark
My 69 T50 fire truck has the "hydraulic steering" option on it, similar to the pictures above but bigger parts. It has the big steering wheel as if it had manual steering. With the engine off it is a bear, if you are stopped it is very nearly impossible to turn the wheel. That however is not a safety issue, if the truck is stopped. With the truck rolling, even a little, it is quite easy to steer and certainly could be pulled to the side of the road safely. I have no worries about the steering failing and not being safe.

Last edited by sweepleader; Thu Apr 11 2019 12:08 AM.

Mac :{)

1962 K10 short step side, much modified for rally
1969 T50 fire truck, almost nos, needs a few things
Re: Big Bolt Power Steering
Spartan #1306668 Thu Apr 11 2019 12:08 AM
Joined: Feb 2019
Posts: 142
S
Spartan Offline OP
Shop Shark
I have been driving mine around for a while without a pump. The steering doesnt feel abnormally stiff or weird. Its just like any other rig without power steering. As far as I know its not dangerous and nothing bad has happened. Now if you lost all your fluid and ran that pump dry for a while that might be a different story...


Hoka Hey!
Spartan

1959 Chevy Spartan 100 "Battle Wagon"
2008 Buell Lightning "War Horse"
Re: Big Bolt Power Steering
Spartan #1306669 Thu Apr 11 2019 12:11 AM
Joined: Nov 2005
Posts: 5,832
3
3B Offline
Master Gabster
Hy Steelonsteel, the system is designed to allow steering if the hydraulics fail.

Re: Big Bolt Power Steering
Spartan #1306692 Thu Apr 11 2019 03:30 AM
Joined: Jun 2011
Posts: 3,775
E
Shop Shark
Saginaw steering on trucks up to one ton are common and be used with for and aft drag links and port and starboard drag link. Saginaw makes larger gear that are
used on 1.5 to 3 ton trucks, larger, double steering gear with similar pump. Should work well with larger truck. Check midsize truck's gear for compatibility.

Probably would be better choice that trying to make antique steering system work.

Ed

Last edited by EdPruss; Thu Apr 11 2019 03:31 AM.

'37 GMC T-18 w/ DD 4-53T, RTO-610, 6231 aux., '95 GMC running gear, full disc brakes, power steering, 22.5 wheels and tires.
'47 GMC 1 ton w/ 302, NP-540, 4wd, full width Blazer front axle.
'54 GMC 630 w/ 503 gasser, 5 speed, ex fire truck, shortened WB 4', install 8' bed.
'55 GMC 370 w/270, 420 4 speed, grain, dump bed truck from ND. Works OK.
Re: Big Bolt Power Steering
Spartan #1306704 Thu Apr 11 2019 08:58 AM
Joined: Jul 2018
Posts: 76
S
Shop Shark
Thank you, fellows, for the input on this steering system situation.
And to Sparton for bringing it up!

Last edited by Steelonsteel; Thu Apr 11 2019 08:15 PM. Reason: Sp.

I have a large carbon footprint. That’s why my wife makes me take off my boots in the house.
1963 Chevy half ton stepside short box 230
1954 GMC 3 ton 302
And several more Chevy camper and work trucks 1979 1987 1996
Re: Big Bolt Power Steering
Spartan #1308695 Fri Apr 26 2019 11:22 PM
Joined: Feb 2012
Posts: 36
S
Wrench Fetcher
On the 3 '67-72 GM C50 trucks I have owned, the PS pump was v belt driven off the crank pulley, the PS hoses went directly to a hydraulic ram assembly that incorporated a spool valve, one end of the ram attached to the tie rod and the other end was bolted to the front beam axle. Movement of the steering gear moved the spool valve which directed hydraulic pressure to the ram, reducing steering effort. Hope this makes sense, this system is as simple as it gets. If a loss of fluid pressure occurs, the steering effort is increased, but manageable. This system would be adaptable to about any straight front axle truck. The '55-57 Chevies had power steering pumps piggy backed on the back of the generator, later Chevies may have had the same system, I expect that the after market restoration houses can supply the special generator with a splined output to drive the special PS pump, big $$$$$ I expect. I don't know when they changed to direct crankshaft driven PS pumps. Crankshaft driven pumps are very common and inexpensive. Corvettes from the mid 50's up used a similar ram system for PS. I don't know if a Corvette PS rebuild kit would work for our purposes or not. Good luck!

Re: Big Bolt Power Steering
Spartan #1308717 Sat Apr 27 2019 10:23 AM
Joined: Apr 2005
Posts: 2,653
C
Shop Shark
Here are a few photos of the ram assist type p/s that we added to a 1940 International pickup. I would think the 55-64 car or up to 82 Corvette system would work on a driving unloaded only truck but a working truck would use the larger ram. On Sparton's truck the ram frame anchor and tie rod end eye for the ram should already be in place.

tapered hole for assist ram in tie rod
[img]https://i.postimg.cc/sBcFkxT0/straight-axle-p-s-002.jpg[/img]

ram bolted in place
[img]https://i.postimg.cc/4mZ6d3P1/straight-axle-p-s-005.jpg[/img]

control valve on rear of drag link---mounts to pitman arm. Upper hoses are the pressure and return to the p/s pump and lower hoses go to the assist ram (position specific).
[img]https://i.postimg.cc/DWVs9ySs/straight-axle-p-s-003.jpg[/img]

The engine is a Chevy V8 with factory belt driven p/s pump.


Evan
Re: Big Bolt Power Steering
Spartan #1308718 Sat Apr 27 2019 10:50 AM
Joined: May 2017
Posts: 344
S
Shop Shark
Nice installation. Obviously anyone who attempts this should be careful about the welding.

There is a pressure control valve in the ps pump that can be changed to alter the pump pressure. It is mounted behind the pressure outlet fitting of the pump. That fitting unscrews and the valve can be extracted and changed. I don't have any info on what valve does what but they are available if the pressure is not right to give the steering a proper feel.


Mac :{)

1962 K10 short step side, much modified for rally
1969 T50 fire truck, almost nos, needs a few things
Re: Big Bolt Power Steering
Spartan #1308788 Sun Apr 28 2019 10:45 AM
Joined: May 2005
Posts: 9,147
G
.
That valve can usually be shimed for adjusting pressure and the size hole in it determines flow rate, can be exchanged for a smaller one for lower flow or larger (or enlarged) for higher flow.


1951 GMC 250 in the Project Journals [stovebolt.com]
1948 Chevrolet 6400 [stovebolt.com] - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
1952 Chevrolet 3800 pickup [stovebolt.com]
---All pictures [picasaweb.google.com]---
"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-
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