Inspecting and servicing the throttle linkage - Dodge Cummins Diesel Forum
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post #1 of 13 (permalink) Old 11-20-2016, 12:05 PM Thread Starter
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Inspecting and servicing the throttle linkage

Because of another thread I discovered my throttle linkage arm was frozen, so I removed it for repair. Since it was off I also bought a pair of bushing for it, since it had been quite awhile (over 300k miles) since they had been replaced, and the first time were replaced they were well beyond serviceable. Cummins part # for the bushings is 3914353 and the Dodge # is 4425053 Expect to pay about $7.50 apiece for them from either source.

I disconnected the upper portion of the intake tube and pushed it aside for more access. Pop off the throttle rod and see if it needs attention later. Disconnect the throttle cable and the cruise cable and disconnect them where they slide into the bracket. I'm guessing you guys with automatics will have to do something with the TPS. Three bolts hold the bracket to the IP.

Backside of bracket is an easily removed spring clip.


Slide the linkage from the bracket. Don't lose the washer.


I pulled the bushings part way out for the picture.



Although they aren't badly worn I replaced then because I had new ones and because of the wear on the shaft from neglecting them in the past. You can see the thinness of the wall on the one on the left and the groove in the shaft.


Clean the sockets at each end of the throttle rod and take a good look. Even though I routinely lube mine one the insert in one of mine was worn through.


Reassemble and reinstall. The whole job shouldn't take much more than an hour.

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97 3500, 2 WD, G56, slightly bombed, 1.3 million miles with un-additized diesel fuel. Started the second million on 8/24/13
If you are lucky enough to be in Texas, you are lucky enough.

Last edited by GAmes; 01-23-2020 at 04:45 PM.
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post #2 of 13 (permalink) Old 11-20-2016, 01:24 PM
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So that's why one of mine was loose and flopping around, the bushings where completely gone, I'll have to check the shaft to see if the unit is rebuildable, does the spring come in a kit, mine's broke.
I don't need it as I've changed to a MD truck linkage but if it can be rebuilt cheap I'll put it in my sellable parts inventory rather than the scrap pile.

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post #3 of 13 (permalink) Old 11-20-2016, 03:30 PM Thread Starter
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According to quickserve the lever and spring come as a unit. Cummins # 3931569

97 3500, 2 WD, G56, slightly bombed, 1.3 million miles with un-additized diesel fuel. Started the second million on 8/24/13
If you are lucky enough to be in Texas, you are lucky enough.
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post #4 of 13 (permalink) Old 11-24-2016, 05:04 PM Thread Starter
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I was paging through my new Genos catalog. They have the bushings for $5.30 each.

97 3500, 2 WD, G56, slightly bombed, 1.3 million miles with un-additized diesel fuel. Started the second million on 8/24/13
If you are lucky enough to be in Texas, you are lucky enough.
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post #5 of 13 (permalink) Old 11-24-2016, 10:33 PM
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GAmes,
Can you describe how or where the throttle linkage was frozen in a bit more detail?
Perhaps more on HOW to determine it was frozen, as well?

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post #6 of 13 (permalink) Old 11-24-2016, 10:56 PM Thread Starter
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The piece with the spring is supposed to bend in the middle. Mine had some corrosion oozing out of the crevice where the two pieces meet and would not bend. I soaked it with penetrant, then put one end in a vice and broke them free.

97 3500, 2 WD, G56, slightly bombed, 1.3 million miles with un-additized diesel fuel. Started the second million on 8/24/13
If you are lucky enough to be in Texas, you are lucky enough.
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post #7 of 13 (permalink) Old 11-24-2016, 11:02 PM
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Thanks for the clarification.

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post #8 of 13 (permalink) Old 11-25-2016, 09:38 PM
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Thanks for the nice write-up and pics, GAmes. It just so happens I've been having some weird, intermittent throttle issues lately. I went to hit the accelerator a few days ago, and it felt like it was completely frozen and would not budge. I had to stab it hard with my foot to get it to move again. I popped the hood and looked at the linkage and it was tight, but I think I still need to take it all apart and inspect it. Something is NOT right.

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post #9 of 13 (permalink) Old 11-26-2016, 09:50 AM Thread Starter
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I did some online searching for the CANZ9700 parts kit and see that the few who have them are scalping, big time. So, it might be a less costly option to just buy a rod assy. I don't know the Dodge part #, but Cummins is 3931468 for the rod, or 3931513 and 3931566 for just the rod ends (one is left hand thread). Before doing that I would visit a local dealer and ask at the parts counter for the kit.

97 3500, 2 WD, G56, slightly bombed, 1.3 million miles with un-additized diesel fuel. Started the second million on 8/24/13
If you are lucky enough to be in Texas, you are lucky enough.
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post #10 of 13 (permalink) Old 11-26-2016, 09:55 AM
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Quote:
Originally Posted by brownbear View Post
Thanks for the nice write-up and pics, GAmes. It just so happens I've been having some weird, intermittent throttle issues lately. I went to hit the accelerator a few days ago, and it felt like it was completely frozen and would not budge. I had to stab it hard with my foot to get it to move again. I popped the hood and looked at the linkage and it was tight, but I think I still need to take it all apart and inspect it. Something is NOT right.
Could your symptoms be due to an FSS not fully lifting?

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post #11 of 13 (permalink) Old 11-26-2016, 11:04 AM
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Are you getting the proper movement and throttle breakover now?

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post #12 of 13 (permalink) Old 01-23-2020, 04:19 PM
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Reopened for OP edit.

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