D6 9U steering issue

The clutches do have springs that hold the disks in engagement - about eight springs arranged around a hub. One guess is that the disks are hung up on a ridge worn into one or both of the hubs. It's a medium size job to refurbish the steering clutches. Parts are available. The main criterion for dozer value is the undercarriage condition. You can determine it by taking various measurements. The easiest way is with a gauge designed for the D6 which is just a flat piece of plate with various cutout that when place against the item to be evaluated, shows the 0 and 100% worn sizes - 100% worn is economically worn out. The other way is to measure to a precision of about 1/8" in order to get a good estimate of the size. There's a diagram on this forum somewhere that shows the measurements to take (someone will chime in with where to find it) and the typical parts measured are: idler profile, roller profile, sprocket tooth wear, and rail height from the grouser plate, and the grouser height itself. A diagram also exists on how to drill the holes required to fit an electric starter for the main engine.

it feels more like the issue is in the clutch oil control under the fuel tank?? the clutch stick is like free nothing to pull against??

Oh ok, I forgot about that. Yes, perhaps the lever inside it is hanging up. You can look in the serviceman's reference for instructions on how to dismantle it. If is is hung up, careful that it doesn't pinch your fingers when it lets go

There are a number of things that could be wrong, to fix most of them disassemble is required. Not a real hard job to get it apart. Since I don't type fast or well, how much experience do you have with old iron? Crawlers in particular. How much history can you get. The springs should be such that the handle is returned so the clutch is engaged and pulling the track. Makes me wonder if the hydraulic steering booster is out of oil and dry parts stuck as you pulled the lever, or when the last guy pulled the lever. Or someone has the linkage way off. Not thinking of many reason the handle is loose and no power. Several things if the lever is good and no power. Now is not the time to worry about that.

By serial number you should have a wet master clutch, which has the hole drilled and taped for a starter. The number says it is a 53 to 56 year without getting a book out.

anyone know the year and horsepower for this 9U188204 ???

[quote="Ricky post=255585 userid=10510"]anyone know the year and horsepower for this 9U188204 ???

[size=150]Are you sure about that Serial Number??
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188 is correct, 024?

188 is correct, 024?

To many digits, only 5 for those old D6's. Missed that the first time. They made the first one in 1947 and the last one in 1958. With a total of right at 30,000 9u's made.

Sorry if my question bothered you, but don't want to explain it from the invention of wheel so to speak. So it helps to know where you are in the process. This is something most can do themselves if that is your way.