If you have a question you would like to ask the Bob, Ken or Kevin please feel free to send an e-mail to firstname.lastname@example.org . Anyone of them will be happy to answer any question you may have. However the guys are busy in the shop so I (Maggie) will be typing for them.
A WORN SHIFTER TURNED INTO A TRANSMISSION IN TROUBLE
Ken wanted to make sure that everyone knew from the beginning that this is a job for a professional. It will take some special tools and since this is a Synchronized Transmission it will be tricky. Ken has been working on tractors all his adult life and said this is the first time he has had to rebuild a Synchronized Transmission on a John Deere 4000. He has rebuilt synchronized transmissions on John Deere 4020’s and John Deere 3020’s as well as on other tractors, so he knows what he is doing. That just goes to show you that the learning process never stops.
THERE ARE MANY SAFTY ISSUES IN THIS PROJECT SO PLEASE BE VERY CAREFUL. IF YOU DECIDE TO ATTEMPT THIS PROJECT.
The first thing we did is to remove the rockshaft covers, sheet metal and the floor. Then Ken drove it onto the cement pad for a wash. Washing the tractor is important so the mud or manure do not contaminate the parts and inside of the tractor.
Then he removed the 3-point hitch housing, bucket loader, seat, fenders and any other attachments that were on the tractor that was in the way.
Note: Make sure you keep all your bolts and hardware separate and labeled so they don’t get mixed together. This was there is no guessing when you go to put it back together.
Disconnecting and draining all the hydraulic lines and electrical lines to the back end of the tractor is the next step. Make sure that you label your lines as to where they go and what they are connected to. Green painters tape works great for this.
The next is to split the tractor. Split it between the transmission and the clutch housing.
NOTE: Remove the shifters and the transmission pump.
When that is done you can remove the top shaft itself. This has to be disassembled in a press.
The next part is the trickiest, removing the Synchronized shaft. This is the cluster at the top shaft. That is why it is called a Top Shaft Synchronized Transmission (TSST)
Carefully check the shifter cam
Check for worn detents or worn cam grooves.
Your next step is to make a parts list
On the John Deere 4000 our parts list consisted of
While this tractor was split and torn down the customer also had Ken replace the load control seal and repack the cylinder for the loader.
SPECIAL TOOLS NEEDED FOR THIS JOB
WHAT TO WATCH OUT FOR ON YOUR TRACTOR
A “Traveling Shifter”. This is when the shifter travels too far and it is partially pulling the tractor back out of gear. Watch the transmission as you move shifter to see it moves into gear or if it actually comes back out part way.
Worn shifter parts. Causing an over shift and the tractor to jump out of gear. This caused damage to the shift collar and the gears.
PREVENT A VERY NORMAL PROBLEM
To prevent this very normal problem as soon as you notice it seek help.
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