Flush or not to Flush, that is the question.

[JoeM 8,293]

Dug into the 8 speed with the hi lo shifter issue. Drained it and added 2 quarts of diesel. Ran it for 30 minutes up on stands. Drained it and removed the trans and opened it up.

I scoped the case and of course can not see the top but what I seen looked pretty good. 

Looks like the flush loosed up some rust, and now there is a film of rusty residue all through the transmission. Made me wonder if it may have been better to just change the oil and leave the rust in place? IDK

I don't think multiple flushes would have made much difference. 

 

 

 

Another note, I see the water was not coming in from the shifter but from under the seat mounting plate. I figure the gasket was not making up in that area and water that built up around the dipstick tube found it's way into the case.

 

 

 

[ri702bill 9,348]

Joe - that bearing looks a mite rough.... does it and its cousin spin freely with no crunchy feel??

That rusted area at the top can be filled with either oil resistant RTV or good old Permatex #2 non-hardening gasket goo.

 

[ebinmaine 72,426]

How long had this transmission set without being used?

 

A friend and I have discussed similar questions about truck axles. Same general situation.  

Their thought was the ONLY right thing to do is dismantle and clean out and rebuild. 

I can see the logic there.  

 

Rust + bearings = bad

[Handy Don 13,980]

16 minutes ago, ebinmaine said:

Rust + bearings = bad

Hmmm. I think that the communitive property does not apply to this here equation.  I doubt that:

rust = bearings - bad, or 

bearings = bad - rust

[JoeM 8,293]

10 minutes ago, ri702bill said:

that bearing looks a mite rough

Yep needs replaced. Plus the outer one will need done too. 

 

this started as being stuck in low range. 

the gearoil that was in the case was not to bad looking. I don't know if it was changed before I got the machine. (machine was picked up at the big show, I have no history)

When I ran the machine the transmission shifted good and was quiet. Turning the axle by hand it was real smooth. No indication of bad bearings or rust problem.

 

16 minutes ago, ebinmaine said:

right thing to do is dismantle and clean out and rebuild

I am thinking the same. If there has been water in the case and the oil is rusty, taking apart clean and repair is the best way to go. 

 

The handful of these cases I have taken apart have some rust on the inside top of the case. It is a shame the cases are not coated inside like the hydro cases. 

I know these are splash lubed and the lube must not fling up to the top of the case to keep it coated. Makes you think 10w-30 would sling better give coating to the case to help with the rust. The gearing really doesn't need extreme pressure lube as there is nothing special in these cases, pretty straight forward. The hydro cases use the same gear types and last a long time on motor oils. 

Just thinking out loud. 

[ebinmaine 72,426]

14 minutes ago, Handy Don said:

Hmmm. I think that the communitive property does not apply to this here equation.  I doubt that:

rust = bearings - bad, or 

bearings = bad - rust

 

 

Well played sir. Well played.   

[Brockport Bill 1,932]

rescued an abandoned C165-8 tractor with gear tranny that had sat outside for few years and had bad shift boot - - took me 3 kerosene flushes before i finally got clear waste pan fluid  -- then put in the new gear oil -- Not sure what the inside of tranny looked like before or after flushes -- but at least the last drips or flush finally was clear -- here is what some of the first two flushes looked like -- ugh !!

[kpinnc 14,585]

8 hours ago, JoeM said:

The handful of these cases I have taken apart have some rust on the inside top of the case. It is a shame the cases are not coated inside like the hydro cases. 

 

I agree with that. It always surprised me how much rust in the top of the case would show up even when no other water intrusion was evident. Of course the condensation issues down here in the south are always a challenge. 

 

Seems like a good coat of rust inhibiting paint would definitely help out on these. 

 

I don't recall what the paint was called that hydros always have in them, but the manual calls for thier use. Wonder if the stuff is even still available?

[mrc 937]

glyptol is an insulating paint.  typically used on machine cases to inhibit rust, stop porosity and aid in oil circulation.   it goes on thick and fills in tiny voids etc  

[oliver2-44 10,689]

Yes Glyptol is available, but expensive.

 https://www.tequipment.net/Glyptal/1201Q/Conformal-Coatings/?Source=googleshopping&gad_source=1&gad_campaignid=21145299531&gbraid=0AAAAA9blpJXqtTfNxX4bP1zRW8LZ6gwd8&gclid=CjwKCAjwvuLDBhAOEiwAPtF0Vt5XtzfllqTC2oVHBMRPp0t2NguCTUVNRGTrXSkEk5KYkg9VuaNjMhoCFYYQAvD_BwE

[squonk 43,735]

21 hours ago, JoeM said:

Yep needs replaced. Plus the outer one will need done too. 

 

this started as being stuck in low range. 

the gearoil that was in the case was not to bad looking. I don't know if it was changed before I got the machine. (machine was picked up at the big show, I have no history)

When I ran the machine the transmission shifted good and was quiet. Turning the axle by hand it was real smooth. No indication of bad bearings or rust problem.

 

I am thinking the same. If there has been water in the case and the oil is rusty, taking apart clean and repair is the best way to go. 

 

The handful of these cases I have taken apart have some rust on the inside top of the case. It is a shame the cases are not coated inside like the hydro cases. 

I know these are splash lubed and the lube must not fling up to the top of the case to keep it coated. Makes you think 10w-30 would sling better give coating to the case to help with the rust. The gearing really doesn't need extreme pressure lube as there is nothing special in these cases, pretty straight forward. The hydro cases use the same gear types and last a long time on motor oils. 

Just thinking out loud. 

I wonder if after a good case cleaning a coating of Glyptal wouldn't help with the rust build up? 

 

Seals uneven surfaces in engine
castings to improve oil circulation