I cannot raise my MMM when the backhoe is attached. It's a 2008 GC2610. I'm beginning to suspect that this thing has been plumbed wrong for sometime. If you read my other posts, you will see that I had problems with the BH blowing lines. I then lost my 3pt valve. Since having the valve replaced by the dealer, I have not been able to raise my deck if the backhoe was on. I know the mechanic switched the fittings around on the BH hookups on the tractor, stating they were backwards from the factory, but since I can't raise the MMM. When running my backhow, I can hear the engine labor more when curling the bucket. In the next few weeks, I plan to pull the tractor in the shop and remove the prear plastic cover and trace all the hydraulic lines. If anyone has any info., please let me know. I called my dealer and they sent me a technical bulletin talking about squalling hyrdraulics when using the 3pt lever. It stated that changing the nylon hoses to rubber hoses will lesson the squalling. I intend to change these out. Sorry for the rambling.