wd 45 hydraulic remote instead of lift arms?

i just bought a 57 wd 45. then got a loader off a wd. the lift arms seem 2 work fine but with the loader plumbed into the rear remote nothing happens to lift the loader. just the rear arms go up and down. there is only 1 control lever. how do i make the fluid go 2 the rear remote to operate the loader and not go 2 the rams for the rear arms? please help. thanks.