My 8.3 Cummins mechanical diesel is now 20 years old. I am finding that on occasion the engine RPM is a little to high when going from a drive position to reverse. I have to go back to the rear and lift the bed to manually pull the throttle back to slow the engine down. With that done, the the Allison will shift. So far, it has happened twice. The Cummins dealer advises that the spring set is now obsolete and are no longer available. Any suggestions from the Forum members? Any help will be appreciated.
I ran into a similar situation with my 96 Dynasty. There is an adjustment that can be made to the throttle assembly to shorten that spring. I played around with it and it was satisfactory for a time, but I ended up simply getting a new spring from my local NAPA store....after installation, you will have to adjust it to get it to perform to your satisfaction. I made some minor adjustments until I got it to where I felt it was perfect......Dennis
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I too replaced my Throttle return spings last year, I also adjusted the pedal "Morse" cable to take some slack out of it. These things just have normal wear for the age.
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edited 01/08/12 07:55am by SCOMP225 *
The throttle shaft and bushing could have excessive wear, causing it to bind up. A stiffer return spring will bandaid it for a while, but the stronger spring will cause it to wear faster, eventually leak, and possibly cause the throttle to stick at a high rpm or jam up and not move at all.
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I replaced that spring along with the TPS bracket a couple of years back. Got both from RVChassisParts.com
The spring was cheap, but the bracket not.
Also, the tension of that spring was pretty sensitive. There are multiple positions that the spring can be placed, and I had to fiddle with it to get the right peddle/treadle feel.
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Just helped a friend replace the spring on his 8.3, got them at an auto part store. Had one in the front with the accelerator and one in the back adjusting the spring base on how it "felt" to the guy in the front.
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