John Deere 430w throttle handle jumps up

[nt254]

I am working on my 1959 John Deere 430w. I am trying to fix a throttle handle that will jump up with any slight bump of the handle thus causing the engine to rev up. I thought it might have been the throttle friction plates but now I am leaning to the governor/carburetor linkages. I have adjusted both (2 turns long on governor linkage, 2 turns short on carburetor linkage). I cleaned the carburetor and the motor runs great. However the throttle handle is way to sensitive. What am I missing? Any thoughts would be greatly appreciated.

 

[Tx Jim]

Did you tighten friction on hand control handle or replace friction disks?

 

[nt254]

How do I tighten the throttle friction plates on it? My I&T Service Manual does not cover this.
Thanks,

 

[Tx Jim]

Remove throttle lever install shim washers or new friction washers reinstall hand lever

https://partscatalog.deere.com/jdrc/sidebyside/equipment/79036/referrer/navigation/pgId/140376

https://partscatalog.deere.com/jdrc/sidebyside/equipment/79036/referrer/navigation/pgId/143432

 

[nt254]

I installed new friction discs today (pretty easy) and now the throttle works as it should
Thanks!

 

[Tx Jim]

You're welcome & thanks for update with excellent results