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Crawlers, Dozers, Loaders & Backhoes Discussion Forum

Jd 420c phase 1 steering problem

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jelfert

03-14-2019 16:17:51




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Just brought home a 420c. Runs really good. It has a steering problem. Pulling the left lever all the way and the left track stops and the right keeps going and pulls it around. Pull the right lever back hard and it just comes to stop. Pull lightly on the right lever and she tries to slowly turn. I notice when I pull the right lever, the foot brake/clutch lever goes down. This doesnít happen when I pull on the left lever. I donít have a shop manual yet.

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Jim.ME

03-16-2019 12:17:52




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 Re: Jd 420c phase 1 steering problem in reply to jelfert, 03-14-2019 16:17:51  
I believe that if the brake rods are adjusted properly, between the pedal shaft connection points and the bell cranks on the steering levers, the brake pedal will not move when either lever is pulled back. The brake pedal never moved when I pulled hard on either steering lever on my 430C. The fact that the brake pedal moves when the right lever is pulled back (note it doesn't move when the left is pulled back) says to me that the steering clutch/brake linkage adjustment on the right side is off. Depending on the adjustment of the engine clutch (amount of pedal free play), when the right lever is pulled back hard and it moves the brake and clutch pedal together; it may be moving the clutch pedal enough to disengage the engine clutch. That would stop all movement. Pulling lightly on the right lever would move the pedals less and may be slipping the engine clutch which would explain the slow turn. JMHO

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rustcollector

03-14-2019 17:55:55




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 Re: Jd 420c phase 1 steering problem in reply to jelfert, 03-14-2019 16:17:51  
Jelfert,

Most likely the brake pedal shaft and the clutch pedal pivot is rusted together. This is a common problem on these machines. I had to drill my brake shaft out on a lathe and make a new one. I put a grease fitting in the end of the new shaft and drilled to get grease into the clutch pedal/brake shaft area. Requires removal of the torque tube to free the shafts unless you get lucky with generous amounts of your favorite penetrate and working the pedals if you can get movement.

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pcsaw

03-15-2019 05:15:38




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 Re: Jd 420c phase 1 steering problem in reply to rustcollector, 03-14-2019 17:55:55  
X2



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keith true

03-16-2019 11:44:28




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 Re: Jd 420c phase 1 steering problem in reply to pcsaw, 03-15-2019 05:15:38  
The pedals sticking together is a common thing on those.I have a 420 that I couldn't get them freed up on,so I unhooked the rod.I can stop by pulling both levers back at the same time.In real life it is something I seldom have to do.If the left side doesn't power around when you pull the right lever,you have slipping left clutches.If it was only the brake hanging up it would bog down and at least try to turn.Steering clutches are really kind of simple on those machines.When I worked at the JD dealer I was the youngest guy there,so I was the crawler guy.Most of the times those steering clutches can be taken apart,cleaned,blasted,lubed,reassembled and adjusted without buying a lot of parts.

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