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Air shift pto will not disengage.....

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Dodsonf855, Mar 24, 2020.

  1. Mar 24, 2020 #1
    Dodsonf855

    Dodsonf855 Bobtail Member

    25
    22
    Mar 15, 2020
    South arkansas
    0
    Pto will not disengage. Checked air switch is working correct. Pulled shifter from pto found gear tooth hold fork.... rolled trans around by barring engine didn’t see any missing teeth. Previously had a pump lock up and scatter pto.. my question is would you refill with oil and run unless it makes noise and gives some indication of problems???
     
    Dodsonf855, Mar 24, 2020
    Dodsonf855, Mar 24, 2020
    #1
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  3. Mar 24, 2020 #2
    baha

    baha Road Train Member

    4,137
    2,834
    Jul 25, 2013
    ga
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    You may have to add a spacer plate under the pto to get enough free play in pto gear so it will come out of mesh with no bind, you should be able to feel a bit of slop when its in gear when you turn the shaft when the pump is off?
     
    baha, Mar 24, 2020
    baha, Mar 24, 2020
    #2
    Dodsonf855 Thanks this.
  4. Mar 24, 2020 #3
    Dodsonf855

    Dodsonf855 Bobtail Member

    25
    22
    Mar 15, 2020
    South arkansas
    0
    Yea it’s got slack. I’m just questioning whether to dig further or fill with oil and make a run at it... doesn’t rattle or show sign of problems.
     
    Dodsonf855, Mar 24, 2020
    Dodsonf855, Mar 24, 2020
    #3
  5. Mar 24, 2020 #4
    rbrtwbstr

    rbrtwbstr Road Train Member

    3,209
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    Jul 11, 2012
    in the bush somewhere
    0
    I just went through this with the truck I drive. A bearing failed in the PTO, and I couldn't turn the PTO off. We found bearing pieces stuck in the shift fork, preventing it from releasing.

    They replaced the PTO, checked the transmission out, and I went back to work. Two days later it happened again. Found more pieces in the PtO, presumably from the original failure, which we think were laying in the bottom of the transmission.

    The end result was flushing the transmission three times, and running it. Been fine since.
     
    rbrtwbstr, Mar 24, 2020
    rbrtwbstr, Mar 24, 2020
    #4
    Dodsonf855, baha and mile marker 27 Thank this.
  7. Mar 24, 2020 #5
    Dodsonf855

    Dodsonf855 Bobtail Member

    25
    22
    Mar 15, 2020
    South arkansas
    0
    That’s what I was wanting to hear!! Thanks... the previous pto blew up 2 years or so ago when the pump locked up and Grenaded... its a wonder this hasn’t showed its head before.
     
    Dodsonf855, Mar 24, 2020
    Dodsonf855, Mar 24, 2020
    #5
  8. Mar 24, 2020 #6
    rbrtwbstr

    rbrtwbstr Road Train Member

    3,209
    7,102
    Jul 11, 2012
    in the bush somewhere
    0
    Yeah they flushed the transmission three times in an effort to clean the debris out. The first two times there was debris still in there. Which meant dropping the PTO three times in total. It was a real PITA for a week or so, but we got through it.
     
    rbrtwbstr, Mar 24, 2020
    rbrtwbstr, Mar 24, 2020
    #6
    Dodsonf855 Thanks this.
  9. Mar 24, 2020 #7
    lwlevens

    lwlevens Medium Load Member

    623
    427
    Feb 9, 2018
    0
    Had the same problem with my tri axle dump PTO was stuck ingaged and sometimes wouldn't engage. They found a tooth broke off in the trans and it sometimes would get stuck in the PTO,got that gear replaced in the trans.$$$
     
    lwlevens, Mar 24, 2020
    lwlevens, Mar 24, 2020
    #7
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