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Old 06-13-2020, 07:54 AM   #1
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C8.3 mechanical throttle "hanging"

The mechanical throttle linkage on my engine is apparently "hanging" i.e. not allowing the engine to return to idle after I take my foot off the pedal.


I have a schematic of all of the throttle linkage components....any advice on how to free things up?
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Old 06-13-2020, 01:16 PM   #2
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On Dodge/Cummins with the P-7100 pump there were issues with weak return springs , that'd be the first place I'd check.
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Old 06-13-2020, 03:39 PM   #3
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This engine has the P1700 pump.


I will order new return springs in addition to lubrication performed this am.


Thanks for the information!
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Old 06-14-2020, 12:23 PM   #4
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Lubricated liberally with Boeshield T-9 (Rod Ends with Ball Joint) and what I could get into the cable itself.


Return spring appears to be very strong as the throttle arm returned to its normal position and idling now at normal RPM.


OEM Rod Ends with Ball Stud have a zerk for lubrication, NAPA replacements do not.


I will add a coating of lubricant before operation to my pre-flight routine.
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Old 08-14-2020, 08:56 AM   #5
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Ordered the OEM throttle return spring from Spartan.


Easy install.....but it takes a bit more pressure on the pedal to get her up and going!


No more throttle hanging on our just completed 1800 mile trip to Virginia.
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Old 08-14-2020, 04:24 PM   #6
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Originally Posted by FormerBoater View Post
Ordered the OEM throttle return spring from Spartan.


Easy install.....but it takes a bit more pressure on the pedal to get her up and going!


No more throttle hanging on our just completed 1800 mile trip to Virginia.
Oh boy, mine is already pretty hard to press - I can't imagine much more. Thank goodness for cruise control.
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Old 08-15-2020, 07:57 AM   #7
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Oh boy, mine is already pretty hard to press - I can't imagine much more. Thank goodness for cruise control.

Yep, the OEM throttle return spring is very strong.



A previous owner had replaced the OEM spring with a smaller gauge and therefore weaker spring......it lasted 63K+ miles for me before it became too weak.


Cruise control was not an option thru the mountains of Virginia on Interstate 81. Was glad to get to flat I-95 on the way home!
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Old 08-17-2020, 01:04 PM   #8
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Oh I agree, no cruise in the mountains for me either - my coach hates mountains. The little 325hp Cummins does great on semi flat land but mountains ..... not so much.
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