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D6 9U Brake Rework questions

D6 9U Brake Rework questions

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ELutter
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Good afternoon. I have recently purchased my first dozer a '59 D6-9U.

The brakes appear to be functional, but it appears they may need some work. The clutches seem to disengage properly as the dozer will come to a stop, without brakes, it the clutch levers are pulled.
The brake pedals did go to the floor, but I adjusted the linkages under the floorboards which seemed to help. However, they still seem odd. If the, brake pedals are slightly depressed, the pedals will oscillate slightly. Also, if the system works better if the brakes are applied then the clutch pulled. If the clutch is pulled first, it seems the pedals move further.

1) Has anyone run into this before?
2) It appears the tank / seat has to be removed in order inspect / adjust the brake bands, is this correct?
3) I have manuals and it appears straight forward, is this correct?
4) Any other thoughts?

Thank you for your help.

Respectfully,

EEL
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Mon, Nov 8, 2010 1:56 AM
ccjersey
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the primary adjustment to the brakes is on the brake band under the seat. You can adjust them from the back under the seat if you want. It's nice to have a short wrench or some channel lock pliers etc to work under there. Harder to do it with rear mounted equipment in the way, but if you have good eyeballs on the ends of your fingers, you can do it! Adjust the steering clutches while you're there.

You may have gotten more room to push the pedal, but you did not adjust the brake properly by changing the length of the linkage rods under the floor boards. You probably should put them back before you adjust the brakes as the pedals may bottom against the upper stops and lock the brakes before you get the brake band mechanism back in the correct position. As you apply the brakes, the brake operating lever needs proper travel between braking and released positions so the brakes release completely.

Notice the procedure to adjust the brake band support screw underneath the tractor.

The pulsing of the pedal is because the brake drums are not perfectly round and since the bevel gear shaft rotates much faster than the sprocket shaft, you feel the rapid pulsing. These can be dressed on a lathe if you have the steering clutches out for repair.
D2-5J's, D6-9U's, D318 and D333 power units, 12E-99E grader, 922B & 944A wheel loaders, D330C generator set, DW20 water tanker and a bunch of Jersey cows to take care of in my spare time😄
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Mon, Nov 8, 2010 2:53 AM
D4C Charlie
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Reply to ccjersey:
the primary adjustment to the brakes is on the brake band under the seat. You can adjust them from the back under the seat if you want. It's nice to have a short wrench or some channel lock pliers etc to work under there. Harder to do it with rear mounted equipment in the way, but if you have good eyeballs on the ends of your fingers, you can do it! Adjust the steering clutches while you're there.

You may have gotten more room to push the pedal, but you did not adjust the brake properly by changing the length of the linkage rods under the floor boards. You probably should put them back before you adjust the brakes as the pedals may bottom against the upper stops and lock the brakes before you get the brake band mechanism back in the correct position. As you apply the brakes, the brake operating lever needs proper travel between braking and released positions so the brakes release completely.

Notice the procedure to adjust the brake band support screw underneath the tractor.

The pulsing of the pedal is because the brake drums are not perfectly round and since the bevel gear shaft rotates much faster than the sprocket shaft, you feel the rapid pulsing. These can be dressed on a lathe if you have the steering clutches out for repair.
Pulsing brakes can also be the brake drum can be loose on the final drive pinion. If you can pry the drum up and down it will tell you if it's loose. Hope they aren't. Charlie
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Mon, Nov 8, 2010 3:32 AM
ELutter
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Reply to D4C Charlie:
Pulsing brakes can also be the brake drum can be loose on the final drive pinion. If you can pry the drum up and down it will tell you if it's loose. Hope they aren't. Charlie
Thank you for the help. I will put the linkages back into their original positions when I work on the brakes. As for the eye on the end of my fingers, they wear contacts and do not work that well. That and the fact there is a big winch on the back of the dozer. I have already taken off the cab and will tear into the seat when I can. This is pretty much a recreational dozer so it will be a couple of months before I start / complete the procedure.

I am glad to hear about the drums. I am also hoping there is not looseness in the drive line.

Thank you again.

Respectfully,

EEL
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Mon, Nov 8, 2010 3:55 AM
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