OC-96 rebuild begins again

Saskfarmer · January 12, 2013, 03:20:50 PM

OK a couple more but thats it. Dont want to spoil the suspense LOL.

Saskfarmer · January 23, 2013, 07:08:51 AM

Got a few more pics resized again.

Bob · February 11, 2013, 05:56:41 PM

The fuel lines are kinda chopped up on my tractor, doesn't sound like it'd be much better than yours.

Bob

Bob · February 20, 2013, 02:31:36 AM

My OC9 is just about to make a trip down to the local scrap yard. I changed the oil in the transmission and drove it out of the shop and now it decided to quit moving again. It is full of fluid, after we checked and put a couple gallons in it still won't go. I'm going to check the pressure regulating valve on the torque converter housing to be sure its free, then hopefully... The oil was nasty and the filter housing was real nasty as well. Just awful discouraging... Transmission oil runs out of the starter... Must be some kind of seal out of it as well...

The list goes on.

Bob

Blake Malkamaki · February 20, 2013, 05:09:56 AM

Bob, call my uncle Howard and see if he knows what is wrong. He worked on their OC-96 for years. I know they were cleaning up a washed out bridge over a wide shallow creek and the tractor died right in the middle of the creek. Would not move.

Bob · February 20, 2013, 05:40:56 PM

Thanks Blake, I'll give him a try.

I talked to the shop in town that I buy parts from today (they work on equipment as well) Guy told me that sounds like the pressure regulator on the torque converter housing. Also the oil running out the starter is probably from a weak scavenger pump, which I don't think the OC9s have. I got thinking about a line that goes to the transmission housing from the torque converter housing has a little uphill bend in it. Maybe that being straightened out will let the oil return properly. The starter is a "wet" starter the way I understand and too much oil in there will cause it to leak out starter while running.

Bob

Saskfarmer · February 24, 2013, 02:39:45 AM

Bob. Im not sure you should have any oil in the bell housing at all. When I took mine apart there was no oil in there at all and mine even hase a small drip hole in the bottom of the housing fot any leaked oil to drip out. I would think you have a seal gone in your converter that is letting the oil into the flywheel housing. There is no scavaging pump in these machines just the main trans pump that supplies pressurised oil to the clutches and lube the transmission. Ill be working on mine in the next few days again and have a look to see where the oil could be coming from, alot easier to see when everything is apart on the bench. If memory serves there is a suction screen in the transmission as well, if your oil was that bad there is a chance it may be starving your converter for oil. Will it start moving again after sitting for a while?

Bob · February 24, 2013, 02:36:43 PM

I got looking at the book a little more and I would say there is deffinately a seal to keep the oil out of the flywheel. We thought it way have a wet starter but after your report and my investigating that is un correct. I left it sit a couple days and yesterday it did try to go, until I shifted into a lower gear then nothing. The converter isn't the problem. I did pull the plug out of the top of it and saw oil slinging around. I pulled the regulating valve off and it seems fine, but haven't torn it apart yet. I'm going to get a psi gauge and put on there to see what it has to say. I lucked out and have an actual service manual for it so that is very helpful.

Blake I'm going to call Howard this evening. Was going to last night but when I got done monkeying around it was too late.

Thanks,

Bob

Bob · February 25, 2013, 01:29:27 AM

I pulled the regulating valve off and cleaned it out today and put ti back on and it works. It seems to work very well now. I moved it and pushed a bit. I parked it out of the way until next time.

Bob

Saskfarmer · February 27, 2013, 03:52:19 AM

Thats good news Bob, at least you know its not a major failior now. Still gotta wonfer about the oil in the flywheel housing though. From what I can see having mine apart now there is only the main seal on the converter drive hub or a couple big O-rings that could cause oil to enter the flywheel housing.
I was looking at my starter as well and they are of the wet type, have the divider plate and seal in them. After looking at a rebuilder site they list 2 differnt starters. One that is the wet type and another later version that isnt but requires a spacer plate between it and the flywheel housing.
Im getting close to trying to fire up my engine now. Hopfully all the grieff of the rebuilding it pays of and all goes well now.