Jd450c tranny leak

Alekanderson · Post by **Alekanderson** » Sat Mar 23, 2013 3:41 pm

Have a 1974 450c, and losing hydraulic fluid from tranny. Appears to be coming from under engine area and draining down skid plates onto ground. Pretty good stream. Any ideas? Thanks

rock digger · Post by **rock digger** » Sun Mar 24, 2013 9:55 pm

Check the hoses that go to the oil cooler in front of radiator. I was skidding woood with mine once and one let loose what a mess.
Hope this helps. Rock Digger,

oljoe · Post by **oljoe** » Mon Mar 25, 2013 2:43 pm

If the hoses or fittings are not leaking the oil could be coming from the front seal on the transmission. I have this problem on a straight 450. It will go through about a gallon an hour. The oil was draining out of a weep hole in the bottom of the clutch housing. I pulled the engine and replaced the seals on the pump and input shaft but I still have a leak. I was going to pull the engine again this winter but never got around to it. I think maybe the pilot bearing may be bad and letting the shaft move enough to cause the leak.

Joe

torove · Post by **torove** » Tue Mar 26, 2013 9:26 pm

I had the same leak on my 1978 550C and got great help on this site.
You have to remove Radiator block, then Engine, then Torque converter and the big seal behind it is the culprit.
While you have it out replace any tube seals you can get to, (6 if I remember right.
The local JD dealership quoted me 6 days plus parts of about $700.
I've never opened up a crawler before, used a friends backhoe to lift engine in and out.
I counted my hours except those for scraping old gunk off outside and painting it all. It took 48 hours .
Thankyou to those who offered advice on here, I forgot to say before and this was 2 years ago.
The shuttle valve block seals were also leaking and I replaced them a bit later. If i'd known at time I would replace them at same time as the other job.

Alekanderson · Post by **Alekanderson** » Fri Apr 05, 2013 3:41 am

Looks like the leak is coming from between engine and tranny, already started a dismantle. Any suggestions on engine removal? I already removed skid plate, hood, floor pans, nose, and am cleaning. I see the four bolts holding engine and tranny together, is there anything else I'm missing? I know I have to get fuel lines, oil pressure line, tach line, misc. wires. Anything else? Thanks in advance.

Alekanderson · Post by **Alekanderson** » Wed Apr 10, 2013 1:21 pm

Have engine out of dozer and assessed parts to repair, looks like input shaft seal is culprit. Also might have to replace input shaft, grooves look to be worn from past. Anyone have advise on pulling input shaft? Thanks

shinnery · Post by **shinnery** » Wed Apr 10, 2013 5:50 pm

Can you find a Speedy-Sleeve the right size and put it on without pulling the shaft? Just an idea if the shaft is otherwise functional.
Bryce

Alekanderson · Post by **Alekanderson** » Wed May 01, 2013 4:41 pm

Update, got a new seal installed, and no more leaks! Also fixed four more leaks in the process, now much better than before. A couple little things left and almost done!

oljoe · Post by **oljoe** » Thu May 02, 2013 12:22 pm

It’s great to hear that the leak is fixed. Was the seal damaged and did you need to install a sleeve on the shaft?

Joe

Alekanderson · Post by **Alekanderson** » Tue May 07, 2013 1:52 am

Seal was in fact torn, I used a micrometer and measured, got a new seal and specs showed very close, so installed and no more leaks! Cheap fix, but many hours cleaning and dismantle.

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Jd450c tranny leak

Jd450c tranny leak

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