Cub Cadet 7274

What do you need to know? It should be a pedal to step on, on the rear of the floor board, and should lock the rear wheels together. It should release when you let off of it.
 
It is not locking the wheels. Is there a spring somewhere that returns the petal upward when released? Have the manuals but all I find is info on the linkage adjustment which we will check this winter. It was bought new and the petal never came up by itself after your foot was removed. It was able to lock up previously. TIA
 
Is it a hydro or gear drive? The transmissions are a little different. If you look on cubcadet.com under service/parts, you can put in the model number and look at all the exploded view drawings. The differential lock is part of the transmission, so there's no telling what's wrong. There are lots of parts in there and it could be a number of things. Also, the differential lock on these tractors is really pretty weak. Just a pin pushes into a hole in the ring gear, and holds it in place. It's not surprising that yours is not working, as this is probably the weakest thing in the whole tranny.

Also, not sure how close you've looked at it, but tearing into it to repair it may be a daunting task. There's lots of O rings and seals In a tranny, and if they're not all cleaned, dried, replaced, you'll probably end up with a leak. If you tear into it, plan on replacing all of the gaskets, seals, and O-rings! Also, the transmission is likely the hydraulic reservoir for the tractor, so everything needs to be cleaned-spotless when you're working, or a piece of crud in the tranny could plug up a line in the hydro control unit and shut it down. Sorry, but there's a reason these are often only repaired by dealers. At least there, if you get it back and it's not working, or it's leaking, they will have to fix it.
 
Our 7274 is a gear drive 4 x 4, 9 forward gears and 3 reverse -- the 7273 is a hydro 4 x 4, both are diesels. Common on both is the common Hytran oil for the hydraulics and transmission. Have looked at the parts blow-up in the manual and online and neither shows the spot in the differential (transmission) that the (in our case) the actuating internal lever pushes against. I'm shure that you are right about the necessary dealer repair in this case. Just too much involved to tackle. Will tackle the exterior linkage check this winter (have to pull a rear wheel) and the backhoe on it is still being used. Will post what we find. Thanks for re-enforcing what I had been thinking.

Charles
 
In all honesty, if it's not just a bent/broken lever, or something obvious on the outside of the transmission, I wouldn't spend a dime fixing it or even a second worrying about it. With 4x4, the locking differential is nearly useless, and with the turning brakes, if 1 wheel spins you can apply the brake to that wheel to make the other wheel grab, essentially making a differential lock and having the same effect. I'd look into the linkage behind the tire, but beyond that, I wouldn't worry about it.
 
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