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KAIMIKAZEE
Joined: 18 Sep 2005
Posts: 130
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| Posted: Mon Apr 28, 2008 7:30 pm Post subject: fifth wheel??? |
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i can feel a bump when stopping and a bump when starting from a stand still start...
it only happens when i'm hauling an MT or load...doesn't do that when i'm bobtailing...
could it be the bushing on the fifth wheel??? |
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KAIMIKAZEE
Joined: 18 Sep 2005
Posts: 130
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| Posted: Wed May 07, 2008 6:51 pm Post subject: |
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| any one :?: |
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HWD
Joined: 24 Apr 2008
Posts: 60
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| Posted: Wed May 07, 2008 7:03 pm Post subject: |
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Doesn't do it bobtailing due to no trailer.
How old is the fifth wheel?
If it's "wallered out" worn due to age and can't be repaired a new fifth wheel may be required...I'd have it looked at soon because it could quickly become a serious safety hazard. |
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KAIMIKAZEE
Joined: 18 Sep 2005
Posts: 130
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| Posted: Wed May 07, 2008 7:14 pm Post subject: |
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[quote="HWD"]Doesn't do it bobtailing due to no trailer.
How old is the fifth wheel?
it's from a 2000 pete...
it doesn't do it all the time.... |
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duck
Joined: 16 Sep 2006
Posts: 128
Location: Green Bay - Wisconsin
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| Posted: Wed May 07, 2008 7:37 pm Post subject: |
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The adjustment of the 5th wheel could be off, the bushings could be shot could be a number of things.
Does it happen with the same trailer and not others or all trailers? |
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no_worries
Joined: 18 Apr 2006
Posts: 843
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| Posted: Wed May 07, 2008 8:07 pm Post subject: |
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| At best you probably need to adjust your 5th-wheel. At worst you need a rebuild or a new one. |
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Larry Heyns
Joined: 19 Oct 2005
Posts: 107
Location: Michigan
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| Posted: Thu May 08, 2008 2:56 pm Post subject: |
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| Any truck garage will have a king pin on a handle to lock in the fifth wheel jaws and check for excess clearance. A mechanic can adjust the jaws. At a truck inspection site, you may be asked to rock the tractor with the trailer brake applied while they watch for movement of the upper fifth wheel plate on the fifth wheel. |
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KAIMIKAZEE
Joined: 18 Sep 2005
Posts: 130
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| Posted: Thu May 08, 2008 6:33 pm Post subject: |
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Does it happen with the same trailer and not others or all trailers?[/quote]
seems to be with some trailers and with some it's okay...
it seems to be doing it more with the lower landing gear trailers when i try to hitch up...
sometimes when i back up easy it doesn't do it that much... |
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mr mopar
Joined: 02 May 2008
Posts: 5
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| Posted: Sat May 10, 2008 6:56 am Post subject: |
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| if you work for a company that has many older trailers or with a lot of drop and hook trailers the king pin can wear out quickly, if you are not sure you can take your truck to a good shop and they will have a test king pin and gauge tool to measure fifth wheel and king pins,your fifth wheel can be ajusted in most cases, if you are told it needs to be rebuilt DO NOT REBUILD it is safer to just replace the top plate about $500 to relace verses $275-300 to rebuild, all a rebuild does is replace the jaws the plate itself also wears. the more that it slops back and forth the more it will damage your fifth wheel. |
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bob h
Joined: 15 Oct 2006
Posts: 664
Location: Nb
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| Posted: Sat May 10, 2008 8:45 am Post subject: Re: fifth wheel??? |
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KAIMIKAZEE wrote: i can feel a bump when stopping and a bump when starting from a stand still start...
it only happens when i'm hauling an MT or load...doesn't do that when i'm bobtailing...
could it be the bushing on the fifth wheel???
Park the tractor-trailer, release the tractor spring brakes. With the trailer springs applied and the 5th wheel still fully locked... and then very cautiously, pull the tractor forward as if you were unpinning, then move the tractor backward as if you wqere pinning... sort of rocking the tractor fore and aft. While you're doing this, have someone watch the 5th wheel from the side of the vehicle, at the drive wheels. Take note of the movement between the 5th wheel plate and the pickup plate... then take note of any movement between the 5th wheel pivot and the tractor frame... you may want a flashlight.
...do you see any movement?
does it 'bump' when you push/pull on the pin? |
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rgordon212
Joined: 07 Feb 2007
Posts: 14
Location: NW Indiana
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| Posted: Sat Jun 07, 2008 10:08 am Post subject: |
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I'm guessing it might be a Fontaine???
I have had problems with them regularly.....
mine does the same thing occasionally, but not all the time. I just had the the annual DOT inspection done and it was out of spec and failed?
I called several places about a rebuild or having them rebuild mine, and they said it would cost about $450-$500...... an new 5th wheel installed was $750 total, so I just had them put a new one on since it's basically just money in the bank. Now it should be good for another 600K miles I hope? |
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Splitshifter
Joined: 19 Jun 2006
Posts: 644
Location: Right here
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| Posted: Sun Jun 08, 2008 7:28 am Post subject: |
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rgordon212 wrote: I'm guessing it might be a Fontaine???
I have had problems with them regularly.....
mine does the same thing occasionally, but not all the time. I just had the the annual DOT inspection done and it was out of spec and failed?
I called several places about a rebuild or having them rebuild mine, and they said it would cost about $450-$500...... an new 5th wheel installed was $750 total, so I just had them put a new one on since it's basically just money in the bank. Now it should be good for another 600K miles I hope?
Smart move.
$750.00 is much cheaper than defending yourself against multiple lawsuits if the trailer would have come off and caused a crash. |
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