73-87chevytrucks.com

73-87 Chevy _ GMC Trucks => 4 Wheel Drives => Topic started by: frotosride on November 19, 2014, 07:44:29 PM

Title: Chevy's amazing steering.
Post by: frotosride on November 19, 2014, 07:44:29 PM
So my big question is do the steering boxes have a  'null' or center for the shaft that has to be aligned? I'm still having steering issues. The truck has always pulled to the right. When I brake now I let the steering wheel go and it pulls left. If I put it in reverse and brake it steers right. I'm sure the braking thing isn't related to the drifting while driving. All ball joints, tie rods drag link, steering arm and whatever the horizontal bar that runs from each spindle is called are all less than 3 years old. I'm driving a lot of country roads now a days and that doesn't bother me but getting in the city with all the other crazies is a little nerve racking. I'm going to try another alignment well toe adjustment. Any other suggestions?
Title: Re: Chevy's amazing steering.
Post by: Engineer on November 19, 2014, 10:06:54 PM
Check your brake calipers.

It sounds like the R.H. caliper piston is seizing up.

It is doing all of its braking with the left caliper, and the right hand caliper is not releasing thus causing the right hand pull while driving.
Title: Re: Chevy's amazing steering.
Post by: frotosride on November 20, 2014, 06:04:17 AM
I thought about that last night. Gonna put the front end up Saturday since its my only day off. Does the proportioning valve adjust bias between front tires? The one that's there is OE from '87. I have been working with hydraulics for over 12 years and rubber orings turn into hard plastic square rings in no time with a little pressure and heat. Is it worth rebuilding or just as cheap to buy another one.
Title: Re: Chevy's amazing steering.
Post by: Engineer on November 20, 2014, 06:52:55 AM
No, the pressure will be equal to both front tires. The only exception being if you have a collapsed front brake hose. Which is also a possibility.
Title: Re: Chevy's amazing steering.
Post by: 78BIG-TEN on November 20, 2014, 08:51:52 AM
In answer to your question,yes the gear does have a center.Steering gear will get tighter when crossing.If memory serves it should take about 18 lbs\in turn over center.Others may want to chime in here.Alot of other factors can cause a slight pull including the tires.My 78 has had a pull to the right since day one.Had it aligned and had the guy to compensate for it which it did but then steering got real touchy so had him put it back
Title: Re: Chevy's amazing steering.
Post by: frotosride on November 20, 2014, 06:58:13 PM
I thoughtit may have been the tires too but even with factory size it pulled. It got a lot better after replacing and I'm beginning to think I need a new steering box. My wheel only attempts to center after turning but which ever direction I turn ialwayshavetocheckitto the opposite dire tion to true it up.

Title: Re: Chevy's amazing steering.
Post by: roundhouse on November 22, 2014, 06:59:37 AM
Replace the calipers pads and flex hoses  and test it out before you replace the steering box
Title: Re: Chevy's amazing steering.
Post by: frotosride on November 22, 2014, 11:21:18 AM
the pads and lines are a year old at the most but even so I have only driven the truck for 2 months so far this year. I'm gonna check the calipers today and try to over power them.
Title: Re: Chevy's amazing steering.
Post by: SkinnyG on November 22, 2014, 01:34:57 PM
Unequal caster left-to-right can also cause a "braking pull."

Ideally, you want the caster equal left-to-right, and you use a bit more negative camber on the right to counter road crown.  Unless something else could be going on with your alignment....  If you haven't hit anything with the truck lately, check for worn bushings and/or joints.

Toe will always center itself, so you can't really have more toe on one side or the other.  Excessive toe may cause the steering to follow things, wander, be twitchy, or be numb.
Title: Re: Chevy's amazing steering.
Post by: VileZambonie on November 22, 2014, 01:42:27 PM
the pads and lines are a year old at the most but even so I have only driven the truck for 2 months so far this year. I'm gonna check the calipers today and try to over power them.

You replaced the lines or the hoses?
Title: Re: Chevy's amazing steering.
Post by: frotosride on November 22, 2014, 04:27:55 PM
Hoses...sorry of all people I should know to be specific with what I mean.I checked the toe today and I'm easily with in 1/8th" 1/4 max if I grossly mix judged 15 times in a row from 3 different angles. What I did find while I had the wheels off was that the steering gear box has a lot of free play. When I atemp to turn the wheels with hands on rotors I can see the pitman arm shaft more fwd and aft at least 1/16th". There's certainly a lot of play. I'm moving the family up to Maine next month so I will have a lot of alone time with blue to fix this issue. I rebuild a lot of intricate electronic controlled hydraulic valves and hydraulic pumps so I feel like rebuilding the box is well within my reach. Anyone think its not worth the $100+ savings of just doing the job myself. Oh and any special tools needed for this other than snap ring pliers. If mno one answers I will likely make the rebuild a thread so maybe it will inspire someone like Eng's monster truck!
Title: Re: Chevy's amazing steering.
Post by: 78BIG-TEN on November 22, 2014, 05:50:43 PM
If there is play in the box try adjusting with the screw on top
Title: Re: Chevy's amazing steering.
Post by: frotosride on November 22, 2014, 06:37:24 PM
If there is play in the box try adjusting with the screw on top

There's a screw...? Gonna have to look at this.
Title: Re: Chevy's amazing steering.
Post by: 78BIG-TEN on November 23, 2014, 01:09:16 PM
In the center of the top cover,loosen nylock hex nut use allen wrench to adjust screw then lock it back down
Title: Re: Chevy's amazing steering.
Post by: Norseman on November 25, 2014, 07:53:34 AM
In order to properly adjust the play in the steering gear, you need to take it off and bless the fluid out. Then adjust to specs, reinstall, add fluid, bleed system and road test. Usually the steering is too tight at this point and you find that the Napa steering gear with the lifetime warranty would have been the way to go. My shop quit adjusting steering gears years ago because the customers didn't like the results.  Better to do it once and be done.
Title: Re: Chevy's amazing steering.
Post by: Norseman on November 25, 2014, 08:38:20 AM
What did you find with the caliper? Many people that replace their own pads don't lubricate the caliper slide pins. This can result in the outside pad holding pressure against the rotor, wearing that pad prematurely and usually warping the rotor. Ford pickups are famous for this.
Title: Re: Chevy's amazing steering.
Post by: Captkaos on November 25, 2014, 10:36:23 AM
That isn't just a matter of adjusting that screw..

Here is the procedure that GM Saginaw Division recommends to adjust the steering box.

Disconnect the pitman arm from the sector shaft, completely back off the sector shaft adjusting screw on the sector shaft cover.

Center steering on the "high point" then attach an inch lb torque wrench to the steering wheel shaft, the torque required to keep the shaft moving for one complete turn should be 1/2 - 2 in lbs.

If the torque is not within these limits, loosen the thrust bearing locknut or tighten valve sleeve adjuster plug to bring the preload within limits.

Tighten the thrust bearing locknut and recheck preload.
Slowly rotate the steering shaft several times, then center the steering on high point.

Now, turn the sector shaft adjusting screw until a steering shaft torque of 3 - 6 in lbs more is required to move the worm through the center point.

Tighten the sector shaft locknut to 35 ft lbs and recheck the sector mesh adjustment.

Total steering gear preload should be 14 in lbs or less.

Install the pitman arm and replace back in vehicle.

NOTE: To try and adjust the sector shaft screw without doing the preceding will DAMAGE the steering gear.
Most of the play is not in the sector shaft adjustment, it is the spool valve area.
Title: Re: Chevy's amazing steering.
Post by: Engineer on November 25, 2014, 04:39:36 PM
That isn't just a matter of adjusting that screw..

Here is the procedure that GM Saginaw Division recommends to adjust the steering box.

Disconnect the pitman arm from the sector shaft, completely back off the sector shaft adjusting screw on the sector shaft cover.

Center steering on the "high point" then attach an inch lb torque wrench to the steering wheel shaft, the torque required to keep the shaft moving for one complete turn should be 1/2 - 2 in lbs.

If the torque is not within these limits, loosen the thrust bearing locknut or tighten valve sleeve adjuster plug to bring the preload within limits.

Tighten the thrust bearing locknut and recheck preload.
Slowly rotate the steering shaft several times, then center the steering on high point.

Now, turn the sector shaft adjusting screw until a steering shaft torque of 3 - 6 in lbs more is required to move the worm through the center point.

Tighten the sector shaft locknut to 35 ft lbs and recheck the sector mesh adjustment.

Total steering gear preload should be 14 in lbs or less.

Install the pitman arm and replace back in vehicle.

NOTE: To try and adjust the sector shaft screw without doing the preceding will DAMAGE the steering gear.
Most of the play is not in the sector shaft adjustment, it is the spool valve area.

This. ^ ^

Adjusting the sector nut without taking the end play out of the worm shaft beforehand will only make the bad steering symptoms worse.
Title: Re: Chevy's amazing steering.
Post by: frotosride on November 27, 2014, 04:21:49 PM
What did you find with the caliper? Many people that replace their own pads don't lubricate the caliper slide pins. This can result in the outside pad holding pressure against the rotor, wearing that pad prematurely and usually warping the rotor. Ford pickups are famous for this.

Thanks for the reminder but learned this lesson over 15 yes ago. But it never hurts to be reminded.
Title: Re: Chevy's amazing steering.
Post by: frotosride on November 27, 2014, 04:29:27 PM
That isn't just a matter of adjusting that screw..

Here is the procedure that GM Saginaw Division recommends to adjust the steering box.

Disconnect the pitman arm from the sector shaft, completely back off the sector shaft adjusting screw on the sector shaft cover.

Center steering on the "high point" then attach an inch lb torque wrench to the steering wheel shaft, the torque required to keep the shaft moving for one complete turn should be 1/2 - 2 in lbs.

If the torque is not within these limits, loosen the thrust bearing locknut or tighten valve sleeve adjuster plug to bring the preload within limits.

Tighten the thrust bearing locknut and recheck preload.
Slowly rotate the steering shaft several times, then center the steering on high point.

Now, turn the sector shaft adjusting screw until a steering shaft torque of 3 - 6 in lbs more is required to move the worm through the center point.

Tighten the sector shaft locknut to 35 ft lbs and recheck the sector mesh adjustment.

Total steering gear preload should be 14 in lbs or less.

Install the pitman arm and replace back in vehicle.

NOTE: To try and adjust the sector shaft screw without doing the preceding will DAMAGE the steering gear.
Most of the play is not in the sector shaft adjustment, it is the spool valve area.

Thanks a lot Cap...! I really was already set on the new box and I'm still going to get it but since you just gave this junkie his favorite drug...I'm thinking for for however many hours I'm going to spend freezing my but off trying to do this just to prove to myself it can be done and help. I do this at work all the time even though I don't have to because most of the time everyone just orders a new onebc thy are too lazy or incompetent to do it. Thanks for feeding my addiction!!
Title: Re: Chevy's amazing steering.
Post by: frotosride on November 27, 2014, 04:30:30 PM
Oh and happy Thanksgiving to everyone...
Title: Re: Chevy's amazing steering.
Post by: frotosride on December 22, 2014, 09:18:28 PM
Well I have decided to just rebuild the steering gear box. I rebuild 3k psi hydraulic manifolds and components at work all the time and I have replaced several o-rings and seal tat have become hard plastic square rings so this really isn't any different. If anyone wants me to take progressive pics and explain the process let me know and I will do just that. I have a lot of specialty tools but if there is anyone who wants me t do it with basic everyday hand tools I will do that as well. The price difference is so drastic that I truly see this as worth rebuild vice buying something that I could have done myself.
Title: Re: Chevy's amazing steering.
Post by: Captkaos on December 23, 2014, 09:55:57 AM
Yes take pictures model it like I did the TBI rebuild if you can listing the tools you used in each step and every step you did.  (keep in mind this will HUGELY lengthen your rebuild time, it took me about 2 hours for that TBI doc).  Would love to put this in the tech section.
Title: Re: Chevy's amazing steering.
Post by: frotosride on December 23, 2014, 07:15:53 PM
Yes take pictures model it like I did the TBI rebuild if you can listing the tools you used in each step and every step you did.  (keep in mind this will HUGELY lengthen your rebuild time, it took me about 2 hours for that TBI doc).  Would love to put this in the tech section.

Deal...consider it done.. first I'm replacing the my Knock sensor see if she runs right and then timing set and Distributor gear If either fixes the issue I WILL IMMEDIATELY tear into the steering gear box.