To separate the concave from beater grate- Remove m10 locknuts on eyebolts that hold the grate onto the concave. They face rearward so the easiest is to access them thru the service door on the left and right sides behind the front tire. Use about 12" of extension with a 15mm socket with a 3/8 air or electric impact. Support the concave with an engine crane or similar device thru the cylinder (Much Easier with rasp bars removed). Remove front concave support castings and cross bar. Remove 30mm bolts from rear concave adjusting eyebolts. Hold grate up with rachet strap or block from underneath. Slide concave forward and rotate front edge up while removing.