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Call the gods of Gravley gear selection


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#1 UncleWillie OFFLINE  

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Posted June 21, 2016 - 07:51 PM

Ok I have a Gravley Commercial 12 that I picked up recently.

IMG_20160607_193828600.jpg

 

It had one irritating and potentially dangerous problem - the axle range control will not stay engaged. If you hit a good bump or go down an hill it will come out of gear. If you pull the handle again it goes back in. I figure that can't be good for the transmission. It doesn't matter if it is in hi or lo it pops out. 

 

I took a look at it today and it has an adjustment on the bottom of the linkage. I have no idea how to know when it is adjusted properly. 

 

Also I was going to take the tire off to be better able to reach the linkage. I pulled off the axle nut and the wheel would not come off. How do you pull the tire on this thing?

 

And where the heck is the serial number on it? I believe the engine was replaced at some time. 



#2 KennyP OFFLINE  

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Posted June 21, 2016 - 08:27 PM

Don't know if it help, but I found a service manual for a Convertible 12. I think it and the Commercial 12 are very similar.



#3 UncleWillie OFFLINE  

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Posted June 21, 2016 - 08:33 PM

That is pretty much for the engine. thanks though I didn't have it before. Now I do. 


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#4 Cat385B ONLINE  

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Posted June 21, 2016 - 08:47 PM

Serial tag or stamp should be down low on the left hand side, forward of the motor.

#5 js5020 OFFLINE  

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Posted June 21, 2016 - 08:52 PM

Nice looking Com 12,, does it have a small diameter roll pin in the control rod for the axle range? many times they are broken off.  The length of said pin is just long enough to fit through the bigger hole of the slot in the dash.  Fix it of you will round off the edges of the dog inside the axle,,, might already be to that point?

 

Serial # on my Com 12 is on the lower right (looking at the implement mounting point) of the advance housing.

 

By the looks of the pics you have the older 6 bolt split rim,, 3 of those bolts are threaded into the center casting that is held on the axle by the large nut.  Remove those 3 specific bolts and she should come right off. 


Edited by js5020, June 21, 2016 - 08:59 PM.

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#6 Cat385B ONLINE  

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Posted June 21, 2016 - 08:53 PM

As far as popping out of gear, check the hi/low range selector plate and lube the linkages. Left side I think, behind the tire. Should be a couple of long springs above a rounded triangular pivot plate; bolt on one side, pin on the other.
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#7 UncleWillie OFFLINE  

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Posted June 21, 2016 - 08:56 PM

I will check for the serial number tomorrow.


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#8 Clifford Bridgford OFFLINE  

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Posted June 22, 2016 - 08:50 PM

Swiftamatic Differential 1.jpg Swiftamatic Differential 2.jpg The roll pin in the axle shift rod is .094 diameter by .688 long Gravely part number 423664.  Any hardware store should have one you can grind to the correct length.

Make sure the shift linkage at the axle is not sticking and the springs are not broken or missing.

 

Cliff


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