LMC1200 C6 transmission failed

[PJL]

Last summer the cat had a fair amount of work done which included a new transmission cooler. We ran it a few times this season and all was good. 2 weeks ago we were running up to one of the mountaintop radio sites to service the generators. Last steep stretch pulling hard in 1st gear in 2-3 feet of new soft snow. Cat stops. No gears. Looked underneath and ATF is everywhere. We called for a rescue rig and they delivered more ATF. We put in 3 qts and drove it back out.

Discovered that the new cooler didn't fit like the old one and a line was pinched. Transmission overheated.

So, the pan is off and lots of fine metal in there. Gearbox needs to come out. Question, is it even at possible to remove it without pulling the cab off? And is this a standard C-6 like I would find under an old F-150 or did the Logan folks have certain mods done to it. The manual that came with it included the Ford C-6 service info. No mention of any gear ratio or valve body mods.

 

[KickerM]

I’d love to comment with lots of knowledge here, but I figured if I add to the thread someone with more knowledge will chime in..To my knowledge the C6 was a standard automotive style with no difference, My FMX was the same as the Automotive style, but mines in a Bombardier vs an LMC…I was able to get a rebuild kit for $130, and Since C6’s are way more popular Id think it would be cheaper yet to rebuild, that way you would retain your valve body, and current gear ratios….with a full cab you should be able to get a jib in from the rear and lift it up and out through the rear door?

 

[PJL]

I believe the cab top has to come off. Like this one. Shouldn't be too tough once they get started on it.

 

[Cidertom]

My $0.02, get a new transmission. once the fine metal particles get loose, there is little chance that you can get them out of all channels, fluid paths. If you have to keep it, change fluid soon and recheck for more metal. the change fluid again....
CT

 

[PJL]

It's been decided. It's coming out. And we got the directive to look for a new machine.

 

[PJL]

Cab split, motor out, transmission at the rebuild shop. Gonna change the pan gasket and rear main seal while it's out. The front and valve cover have been done. Also found the plywood deck under the rear seats has rotted away. That will get done too. Any thoughts on plywood vs some type of plastic?

 

[Cidertom]

if it were mine, I'd use pressure treated plywood. I think plastic thick enough and rigid enough would be a pain to work. I like pt plywood over paint for wet applications though if you cut it to fit and then payed close attention to edge sealing it would probably work fine painted.

 

[PJL]

I'm tending to agree with you Tom. The original deck lasted 35 years. 35 years from now I will probably have shuffled off this mortal coil and it won't be my problem.

 

[PJL]

C-6 is back from the shop. Motor will be resealed while it's out. New deck being installed. The builder at Logan left us an Easter Egg.

 

[DAVENET]

That's awesome

 

[PJL]

New deck. Used marine plywood and multiple coats of bed liner like material. Engine and transmission back in. While the motor was out the mechanic resealed it. Discovered that the prior owners had gooped the oil pan with orange silicone. It had pooched out of both sides. Found it's way into the pickup tube and the oil pump. Dodged a bullet. The transmission cooler was completely redesigned.

 

[KickerM]

Thats looks Great! Keep up the good work!

 

[PJL]

Thanks, engine and transmission back in. Cab top back on. Interior being put back together. Mechanic got it all running. Said he had 60si on the oil pressure. Should have the tracks back on next week and be able to drive it around.

 

[KickerM]

Apologize that Ive been vacant on the Forums all summer, but Good Call on the Marine Plywood, That’s what I used on mine! Easy to work with and attach things where ever you need it, and relocate it if it isn’t right.. It was recommended to use treated hardware with it…

 

[PJL]

Well, it took longer than a week to get it back. Mechanic had a minor setback. Turned out the trans temp gauge he installed was connected to the tach trigger. Not the + side. It ran but barely. By now everything on this machine has been touched. Should be good for another 30 years. Test run up the Denny Creek Rd. It drives like a new machine.