I had a feeling that's what you had. Most Rammer breakers are fairly straightforward with the in/out ports on the left and right sides of the breaker, pretty hard to mess up connection to them. But the M18, the ports are on the face of the breaker facing the machine, and they're vertical, one port over top of the other, one has to pay attention to which port is in and which is out on the M18. And it's a helluva good breaker for that size machine. It's a short stroke piston which makes it reciprocate very fast. Instead of a thump thump thump, more like a machine gun. I'm only concerned about you fitting it without checking flow/pressure. Although the M18 can handle something like 60 gpm, I've found it's best to run them at around 48 to 50 gpm to get long life from the unit. And I'm not familiar with the Deere 240, but make sure there's not a switch inside the cab that combines flow from the two pumps, sort of like High Flow for a skid loader. I know on many Kobelco machines they have a "Pump Conflux" switch that does just that. When that happens and an operator flips that switch, yeah, that hammer REALLY breaks rock. Uhh, yeah, you've doubled the flow to the breaker! Rapid destruction follows. Don't ask me how I know that.