920 mo-co disc synchronizing?

[Camozzi04]

Need help synchronizing a 920 mo-co. Basically from the bare cutterbar up.

 

[JMS/.MN]

If it"s like a NI 5209, take off the turtles, unbolt the gear cover, and rotate the gear and shaft to set the shaft square with the machine. Reassemble with turtles at 90 degrees to the adjacent one. 5209 has a common drive shaft, so if misaligned, means a twisted shaft. Some machines have gear to gear drive instead of a shaft.

 

[Camozzi04]

It has a sprocket that goes into the bar that is turned by gears. The shaft of the sprocket comes up through a plate with a bearing in it. It's that plate that confuses me. It can be shifted to the left or right depending on how you want to bolt it down. I would think this gives you clearance for turtle collision.There's a v-notch in the plate which I'm sure is a timing mark.after that goes the driver (shears if damage occurs)with a timing mark to match the shaft timing mark, then turtles at 90 degrees. There are 6 disks total. Trying to get a pic up!

 

[JMS/.MN]

Is a 920 a JD moco? I think it"s what my son has. I"ll take a look at it.

 

[Roger in Iowa]

Should have a picture in OM on cutterbar set-up.

 

[Camozzi04]

The OM doesn't really get into to much depth. Doesn't even walk you through changing the bearing. It goes to the driver that's about it. The OM does show the break down on both right and left. The problem is the pics are small and you can't make out the timing marks. I just ordered the technical service Manuel from John Deere for $80 dollars. Gonna take about ten days to get here. It's spoused to be a bullet proof machine once up and running. I hope.

 

[Roger in Iowa]

Curious to what and who put it down? Normally you do not get into the gear train, only replace shear hubs....

How many disc does it have? Half turn toward the center and other half turn toward the center. Think the shear hub only
has to be square with the one adjacent, then the center two turtles are 90 degrees to the other, then each out board from
there is 90 degrees to the other. Just so they do not hit knives when turned by hand.

 

[Camozzi04]

Roger,
Glad to answer your questions. So the story goes like this:
Recently purchased the 6 disc 920 roller conditioner early May 2015. I see what your saying shouldn't need to get into the cutterbar. Not much going on in there. Except coolant capacity and about 11 gears( guess). The former owner said the nut on the left hand drive yoke backed out throwing the driveline out into the crop, somehow destroyed the left hand bearing in the process. He had all the parts when I arrived said "$1500 you fix" or "1800 I fix". Being hay season with plenty on my hands I said "you fix". thee only thing he didn't do was add the oil to cutterbar. So I did. I also trusted his work.
What he didn't do was remove all the roller bearings from the cutter deck that had fallen inside when the initial bearing went out. I don't think it was intentional but a poor effort indeed. It did a pretty good number on my machine. So I've torn it down to check internals. It boogered two teeth on the second to left gear in deck and then my left hand drive sprocket has seen better days. This is everyone's nightmare come true.

 

[Roger in Iowa]

I would agree with the nightmare! Make sure you take it all apart, because if there is one particle/piece left in there you
will have to do it again....

It would have helped if you had numbered each spindle and noted it's location. Spindle location determines rotation direction.
Believe the two end spindles are mounted so the rotation is inward. From there I do not know. The service manual will have the
information.

Sorry for the mess, but it is rebuildable. Make sure you find all the pieces!!!