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Re: Allison HT740 shift problem by Randy
Post New Message It sounds like your modolator is not working properly. First thing, you need to find out if it is a cable modulator or air modulator.
If it is a cable modulator it can be adjusted if it is not broken. Remove the end from the transmission, which is located on the left hand side (in your case the passenger side) just above the top of the oil pan about 2/3 of the way back. There will be a pin inside. Have someone step on the throttle to see if the pin moves in and out with the throttle. The engine may have to be running to do this. If the cable is not broken, then locate where the cable attaches to the throttle linkage. At full throttle you should be able to pull the end of the modulator cable about 1/8" past the throttle linkage.
If you have an air modulator. Remove the air cylinder. Apply shop air to the air inlet side of the air modulator. If any air leks by to the plunger side of the modulator, replace the modulator.
Hope this helps if there is something else you need to know feel free to call me at 715-273-3893.
All Messages in ThreadAuthorDate
Post New MessageAllison HT740 shift problem kurt 7-11-05  
  Reply to MessageRe: Allison HT740 shift problem luis 2-11-08  
  Reply to MessageRe: Allison HT740 shift problem Randy 7-20-05  
  Reply to MessageRe: Allison HT740 shift problem Geoff Warren 2-1-13  
  Reply to MessageRe: Allison HT740 shift problem mike miraglia 9-20-08  
  Reply to MessageRe: Allison HT740 shift problem Yugani 6-17-09  
  Reply to MessageRe: Allison HT740 shift problem Asst Chief Michael Papke 8-24-11  
  Reply to MessageRe: Allison HT740 shift problem SGT. Covellone, M. 3-4-10  
    Reply to MessageRe: Allison HT740 shift problem SSG Rafael Garza IV 3-14-10  
      Reply to MessageRe: Allison HT740 shift problem larry price 4-30-14  
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