Why is hydraulic fluid getting into my Moxy MT36 transmission?

[Marcus Marcus]

I'm having an issue with a Moxy MT36 dump truck where the transmission keeps filling up with hydraulic fluid. When the fluid level gets too high, the truck won't shift. If we drain the excess fluid, it shifts normally again. I'm trying to figure out where the hydraulic fluid could be crossing into the transmission. Has anyone run into this problem before or know a common failure point on these trucks?

 

[Daylan Goughman]

That definitely sounds like an internal leak somewhere. I'd take a close look at the transmission oil cooler or any hydraulic pump seals that share the system, they're common places for fluid to cross over.

 

[highwayBoss]

That's where I'd start too. I'd also keep an eye on which fluid level is dropping—that can help narrow down where the crossover is happening.