20k steer axle

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by SL3406, Apr 16, 2024.

  1. SL3406

    SL3406 Medium Load Member

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    I recently bought a 2006 Peterbilt 357 equipped with a 20k steer axle. Single box with a assist cylinder on the

    passenger side. 40 acres doesn't seem to be quite enough to turn this thing around. I was wondering if

    replacing the axle with a later style wide track axle would help? The tag on the axle says Westport Axle Corp.
     
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  3. North Pole Nightmare

    North Pole Nightmare Heavy Load Member

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    It might have some stops on it you can adjust or take off and get a sharper turn radius,make sure your tires don't hit the frame when turning all the way if you take them off.
     
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  4. SL3406

    SL3406 Medium Load Member

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    The stops were already turned in as far as they would go. I took them completely off, but it didn't seem to help much. Nothing gets close to touching with no stops.
     
  5. dirthaller

    dirthaller Heavy Load Member

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    In’99 my buddy speced out and purchased a new 379 with the standard track setup (same as yours with the hydraulic assist). He was adamant about having a TRW steering gear instead of a Sheppard. That 260” wheelbase truck turned pretty dang sharp. I’m not sure if the gear itself had alot to do with it or not.
    I had a 230” 379 with a Sheppard and a 260” 379 with a TRW. I slip seated these two at the same time.The longer truck turned sharper (2002 and 2003 year models respectively).
    When I speced out my new 389 in 2013, I was adamant about a TRW steering gear. They wouldn’t let me have it and ended up with a Sheppard. My 389 has the wide track front axle and it turns impressive sharp.
    All these aforementioned trucks had the bumpstops adjusted past the factory settings ( my 389 tires actually hit the gear/pitman arm if I lean too hard on it).
    If you have a Sheppard on a standard track, you might have the same problem as my 2002 379.
    My buddy’s 379 is the only aforementioned truck that has the 20k hydraulic assist.
     
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  6. W923

    W923 Road Train Member

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    So are you running out of travel on the cylinder or the gear…usually with stops removed something hits pretty good
    I assume you have at least 385 tires maybe with 315s nothing would hit
     
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  7. BoxCarKidd

    BoxCarKidd Road Train Member

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    This stretched day cab will not make a u turn from one side of a 4 lane divided state road to the other. That is not a problem because we are not allowed to do that anyway, right. I bought it this way and just learned how to drive it.
    It is a set forward axle. The set back axles turn a lot shorter turning radius.
    Most times KIMG0159 (2).jpg I tried doing things like you are taking about I ran into problems. Springs are different width, spring hanger off set is different, Neither of the drag links will work etc. Think long before you jump into swapping parts around.
     
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  8. skallagrime

    skallagrime Road Train Member

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    Shoot a pic of the profile of truck, do you have the forward or rearward axle version, that will change a lot more than you may think in your perception of how it turns. Ive driven forward and rearward steer axles on both petes and kws amd the rearward steer ALWAYS *seems* to turn tighter than the forward steer even if the wheelbase on the forward is shorter
     
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  9. SL3406

    SL3406 Medium Load Member

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    It has 315's, 245 wheelbase, set forward axle. It's a 10 wheeler dump truck with a 17' box. I thought it was the cylinder running out of travel too, so I unhooked the cylinder from the knuckle, and turned it lock to lock sitting in the shop.

    Just visually, there didn't seem to be a difference in how far it turned. Most of what I do is residential deliveries, and this truck simply won't do what I need to do, so learning to live with it won't be a good solution.
     
  10. W923

    W923 Road Train Member

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    With the wheels pointing straight ahead take a picture of the pitman arm and drag link from the side if possible.

    If the box doesn’t have enough travel you might be able to put a longer pitman arm on…I did this on a ford with 20k from and a steering box on both sides
     
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  11. SL3406

    SL3406 Medium Load Member

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    That's an interesting idea. I will try to get a pic.
     
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