Jd 420c phase 1 steering problem

jelfert · Mar 14, 2019

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 doesn?t happen when I pull on the
left lever. I don?t have a shop manual yet.

rustcollector · Mar 14, 2019

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.

pcsaw · Mar 15, 2019

Keith True · Mar 16, 2019

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.

Jim.ME · Mar 16, 2019

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

Bernie/MA · Mar 27, 2019

If you have to take the final drive off don"t forget the two bolts that go in from the inside near the housing bottom.

PJH · Mar 27, 2019

Also - don't forget the dowel pin - one on each side of the tractor. Top left as you are looking at the final drive case.

jelfert · Mar 27, 2019

I disconnected the pedal brake lever. Steers fine now. Gonna have to unseize the shafts next.

Jd 420c phase 1 steering problem

jelfert

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rustcollector

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pcsaw

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Keith True

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Jim.ME

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Bernie/MA

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PJH

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jelfert

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