Runaway throttle

Farmall Cub Forum -- Questions and answers to all of your Cub related issues.

Moderator: Team Cub

Forum rules
Notice: For sale and wanted posts are not allowed in this forum. Please use our free classifieds or one of our site sponsors for your tractor and parts needs.

Runaway throttle

Postby Dusty B » Sun Jul 28, 2013 8:54 pm

Engine starts and runs fine, but w/the throttle completely back it w/gradually keep increasing RPM's up to wide open even though the throttle lever isn't moved?? Where do I look first? Thanks, Dusty B
Grandpa's '41 B
'56,,'57,'59,'71 Cub
'51 Super C
'55 Case SC
Fairbanks-Morse 3KW Generator
Dad's DB garden tractor
'48 DeSoto
'31 "A Coupe
'51 Ford PU
'55 Dodge PU
God looks out for those of us who don't know how to look out for ourselves!
User avatar
Dusty B
5+ Years
5+ Years
 
Posts: 1291
Joined: Wed May 23, 2007 7:35 am
Location: IL, Downs
Zip Code: 61736
Tractors Owned: '45 SC Case
Fairbanks-Morse Generator
Circle of Safety Award
Circle of Safety: Y

Re: Runaway throttle

Postby Cecil » Sun Jul 28, 2013 8:59 pm

Check for slop in the throttle linkage between the governor and the carb.
Cecil
Team Cub Mentor
Team Cub Mentor
 
Posts: 3687
Joined: Tue Jan 11, 2005 12:12 pm
Location: Kinderhook, NY
Zip Code: 12184
eBay ID: adak8965
Circle of Safety Award
Circle of Safety: Y

Re: Runaway throttle

Postby Hengy » Sun Jul 28, 2013 9:00 pm

Check all linkages from throttle control to the carb. Has the rod come loose between the left side rockshaft and the carb?
Mike (Happy as a Lark in Allison Park, PA)
Image Image

Check out my Restoration Thread (1955 Cub, Lewis)
User avatar
Hengy
5+ Years
5+ Years
 
Posts: 7073
Joined: Sat Feb 18, 2006 8:12 pm
Location: PA, Allison Park (Am Hengelsberg)
Zip Code: 15101
eBay ID: lacrosseorgans
Skype Name: Mike.Hengelsberg
Tractors Owned: 1949 Cub "Merlin"
1955 Cub "Lewis"
Cub Trailer
A-60 Blade
Cub-22 Mower
193 Plow
Circle of Safety Award
Circle of Safety: Y

Re: Runaway throttle

Postby Boss Hog » Mon Jul 29, 2013 2:31 pm

check the pin in the gov weights
IN GOD WE TRUST
All others pay cash
Boss Hog
Power corrupts; absolute power corrupts absolutely byJohn Emerich Edward Dalberg
User avatar
Boss Hog
Cub Pro
Cub Pro
 
Posts: 9804
Joined: Mon Oct 24, 2005 8:35 pm
Location: VA. Randolph
Zip Code: 23962
eBay ID: dmb2613
Circle of Safety Award
Circle of Safety: Y

Re: Runaway throttle

Postby Dusty B » Tue Jul 30, 2013 7:16 am

Thanks, forgot to mention that when I do pull back on the throttle lever it w/slow back down temporarily, but then speeds back up when I release the pressure on the throttle lever. Really have to put pressure on to get it to slow down though. Dusty B
Grandpa's '41 B
'56,,'57,'59,'71 Cub
'51 Super C
'55 Case SC
Fairbanks-Morse 3KW Generator
Dad's DB garden tractor
'48 DeSoto
'31 "A Coupe
'51 Ford PU
'55 Dodge PU
God looks out for those of us who don't know how to look out for ourselves!
User avatar
Dusty B
5+ Years
5+ Years
 
Posts: 1291
Joined: Wed May 23, 2007 7:35 am
Location: IL, Downs
Zip Code: 61736
Tractors Owned: '45 SC Case
Fairbanks-Morse Generator
Circle of Safety Award
Circle of Safety: Y

Re: Runaway throttle

Postby FCUBMAN » Tue Jul 30, 2013 9:23 am

Sounds like the governor is bad. Boss Hog probably nailed it. The weights are what bring the throttle down when the RPMs go up.
"Remember, I'm pulling for you - we're all in this together!"
Quoted from Red Green of Possum Lodge

When you get older, lack of pep is often mistaken for patience.

(1956 and 1948 Cubs)
User avatar
FCUBMAN
5+ Years
5+ Years
 
Posts: 441
Joined: Thu Dec 28, 2006 12:35 am
Location: CT, Northern
Zip Code: 00000
Tractors Owned: 2 Cubs
1 Simplicity
1 Craftsman
1 Farmall 130 with loader
1 Tiger

Re: Runaway throttle

Postby SONNY » Tue Jul 30, 2013 10:51 am

I have two of them doing the same thing,--- only after they have been run and pulled hard and are warmed up! thanks; sonny
SONNY
5+ Years
5+ Years
 
Posts: 2241
Joined: Thu Nov 09, 2006 11:26 pm
Zip Code: 00000


Return to Farmall Cub

Who is online

Users browsing this forum: No registered users and 2 guests