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D4-7 Bush Hog Rear End Troubles.

transmission bush hog

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#16 VTXrider OFFLINE  

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Posted July 03, 2013 - 08:23 PM

My T-63 had the same type of symptoms, pinion gear looked good, ring gear was damaged. It would catch one way then rotate back the other way catching again. It would rotate all the way around but would catch on each rotation.

I was thinking the axles are bolted to the frame? I guess you could pull an axle tube off with transaxle attached.

Look at the manual regarding these transaxles, I think there is one side that is the better side to pull off the axle tube to get access to the differential.

Hope you get it figured out!

They are bolted to the frame with U-bolts. Unlike my 990s, which mounts the transmission to the frame leaving the axle tubes more accessible. 



#17 VTXrider OFFLINE  

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Posted July 03, 2013 - 08:25 PM

Sorry, I realized you said the cluster gear did look good.

I have a D4-7 and a T-63 with the rear ends out. I have all the parts including a NOS ring gear. Just got to find the time to do it.
I know of another NOS ring gear. The guy wants $150 for it. I told him earlier i would be willing to pay $100 and he did not take it. I am sure he still has it.

If you could connect me with your ring gear guy, I would be interested in buying it.



#18 VTXrider OFFLINE  

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Posted July 03, 2013 - 08:34 PM

Looking at the manual, it indicates that the ring and pinion shaft are a matched set and should be bought together. What are my chances of problems if I get just the ring gear?



#19 sacsr OFFLINE  

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Posted July 03, 2013 - 08:52 PM

Looking at the manual, it indicates that the ring and pinion shaft are a matched set and should be bought together. What are my chances of problems if I get just the ring gear?


I don't know. Chances of finding a matched pair is pretty rare unless you find a used set. I am going to have to put mine together and it will not be a matched set. Will see how it works out.

I can see if he still has it.
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#20 VTXrider OFFLINE  

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Posted July 04, 2013 - 12:24 PM

Got the rear end apart and examined. While draining the oil, pieces of metal fell out. Once apart, the bottom of the case was littered with metal. 

Removing the right side axle tube gave access to the gear cluster and it slide right out. The pinion is pretty beat up but not broken. The ring gear is destroyed. A new gear is in order and SACSR has offered to sell me a used but repairable unit. 

Thanks for giving me the confidence to tackle this.

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#21 Texas Deere and Horse OFFLINE  

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Posted July 04, 2013 - 12:40 PM

Wow, Not wonder if was binding with the way that ring gear looks. Be sure to inspect those bearings and races for damage also.


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#22 sacsr OFFLINE  

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Posted July 04, 2013 - 12:42 PM

Looks like what I saw on my other transaxles with issues. I will search for the part over the weekend. I am leaving early in the morning to go to Denton so will not have a chance to mail it. PM me with your mailing address, etc and I will send it asap....if they are open Saturday Hopefully I can find it and ship it then.

 

I have access to pinion gears as well....so let me know. From what I have seen the pinion gears usually look pretty good.....the major damage is always to the ring gear.



#23 sacsr OFFLINE  

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Posted July 04, 2013 - 12:45 PM

Wow, Not wonder if was binding with the way that ring gear looks. Be sure to inspect those bearings and races for damage also.

Brian good idea.....my plan on putting mine back together is to check it with out a load first to make sure it is not binding.....then test it again with a load.......definitely need to watch it for a while to make sure it is connecting well. Since both of my transmissions are completely torn apart, I am replacing most of the bearings while I am there. They seem to spin freely with almost no play.....but figured I would get it done while it was already broken down.

 

 

Just a note about the axle on this unit. This is the earlier version, the axle housing are lighter steel and the axles are held to the frame by ubolts.

Also these mounts slide on the axle tube cover......the next version had the mounts welded to the axle tube cover....and the final version had a caste iron/steel axle tube cover and the mounts were cast into the cover.....the last one is much heavier and probably only found on the D4-10's.


Edited by sacsr, July 04, 2013 - 12:50 PM.

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#24 VTXrider OFFLINE  

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Posted July 04, 2013 - 05:02 PM

What would cause this much damage to the gear? Could there be too much strain by adding the front wheel drive from the parking break drive shaft? Should I disconnect the front drive? Any comments welcome.



#25 olcowhand OFFLINE  

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Posted July 04, 2013 - 05:14 PM

There should be no added strain on the ring & pinion IF the FWD is geared close to the ground speed of the rear wheels.  The load on the park shaft can't affect the pinion in itself.  But if ground speeds are different, then the front end will be fighting the rear.


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#26 VTXrider OFFLINE  

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Posted July 05, 2013 - 06:28 AM

To check the gearing between the front and back, I could measure 1 rotation of the front tire and apply that measurement to a marked point on the rear tire. If it is close then all is well. If not, then I will disconnect the front drive. 

The work the PO did to modify this tractor is done well, I would think he did his math on this also. The gearing is determined by this sprocket setup to the front drive.

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#27 olcowhand OFFLINE  

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Posted July 05, 2013 - 08:54 AM

Likely he has it real close if not spot-on.  But sure is a good idea to double check it.  



#28 Texas Deere and Horse OFFLINE  

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Posted July 05, 2013 - 10:29 AM

VTX, If there is any way to get a few shots of the whole underside, drive train, I would like to see how it's all been done.. :thumbs:



#29 VTXrider OFFLINE  

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Posted July 05, 2013 - 12:50 PM

VTX, If there is any way to get a few shots of the whole underside, drive train, I would like to see how it's all been done.. :thumbs:

Sure Let me see if I can lift the rear end high enough to get a good shot.


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#30 Texas Deere and Horse OFFLINE  

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Posted July 05, 2013 - 01:09 PM

And your Photo Bucket link in the other thread doesn't work..







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