Meritor Steer Axle -> Expert Advice Needed Re: Upgrade

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by rbrauns, Apr 6, 2020.

  1. rbrauns

    rbrauns Light Load Member

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    Dec 7, 2014
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    I hope there are some Meritor steer axle specialists on this forum.

    My truck's springs and kingpins are worn out. I have a Meritor MFS-12-143A-N axle abd dm thinking that I should upgrade my steer axle to 13,200 lbs (Meritor MFS-13B-143-A-N) or even 14,600 lbs (Meritor MFS-14F-143-A-N).

    I asked Meritor if I could reuse the spindles, hubs and brakes from my existing 12,000 lb axle but Meritor told me to contact my Freightliner dealer.

    Of course, the dealer will sell me a shiny, new and overpriced complete steer axle but I want to know if I can just buy a used I-beam and new springs and reuse my existing spindles, hubs, brakes, etc.

    Does anyone know if these other components are the same?
     
  2. spsauerland

    spsauerland Road Train Member

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    The short answer is yes, knuckles will work so that means hubs and brakes will too. Why do want to change beam? Are bores wore out? If trying to change GAWR for steer, the law man goes by sticker in door, not tag on axle.
     
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  3. rbrauns

    rbrauns Light Load Member

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    Thanks for your response. I haul triaxle flat deck and with tanks more than 1/2 full, I'm always overweight on my steers. I will need get a dealer to change my GAWR for the steers but they said I needed a new beam because they are stamped with a weight rating. The dealer is willing to change the GAWR for a fee but I'll need to ask how much.

    Thanks for your answer. It was super helpful.
     
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  4. 062

    062 Road Train Member

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    @earnies2 had a steer axle re-rated not long ago.
     
  5. spsauerland

    spsauerland Road Train Member

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    West Harrison, In
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    The MFS 13 and 14 do have 1" wider track. Just remember you would probably have to go to a 315 tire on steer to meet weight rating of MFS 14 and at least 16 ply tire on MFS 13.
     
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  6. earnies2

    earnies2 Medium Load Member

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    Yes I did I went to a spring shop. They added 1 leaf to each side to bring the spring capacity to 14k. I also went to load range H tires that gave me 14k the spring shop than put a sticker on my door jamb for 14,400 lbs. I also unbolted my 5th wheel and was able to move it back 2 bolt holes now I run between 12800 and 13800 when full of fuel...
    Go to a spring shop not a dealer
     
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  7. earnies2

    earnies2 Medium Load Member

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    I run goodyear 295/22.5 and they are rated at 14,400 or 7200 each
     
  8. tommymonza

    tommymonza Road Train Member

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    Long as you are all on the subject may I ask a question?

    I bought a used 1997 international 9300 with 2-150 tanks slung forward but have yet to put on the road, shows it has a 13800 front axle on the original build sheet it came with.

    So if I have the similar weight rated steer tires and I go over the scales at 13200 do you you get pulled around every time your over 12000?
     
  9. earnies2

    earnies2 Medium Load Member

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    Most scales set there weight at 14k there are a few that lower it to 12k to be a ###
    The scale that got me in Tennessee stated I can write up every prostar and Volvo because they are built overweight on their front axle and I had just filed. He was just being an ### but he was correct I was over on my front axle but way under gross weight I only had 15 k on the deck. He made me buy 2 new load range H tires. The tires I had on were 2 months old. ...so in one way he was rite for the tire r as thing but my springs and axle was still 12k so even though he wouldn't let me bobtail 3 miles to get the tires after they installed the tires he let me leave with a overweight axle and springs go figure....in 45 years of trucking I have never seen that and I'm sure he got a kickback from the tire guy
     
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  10. 062

    062 Road Train Member

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    I think it was the Greenville Tn scale that a cop was busted for something like that a few months ago.
     
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