42" snowblower attachment help needed
 

I have a 42" snow thrower attachment, model number OEM-190-032,(190-032-101), for my SLT 1554 lawn tractor. I was throwing snow and I scooped up a large rock. It made it past the augers without damage, but then got jammed between the impeller and the discharge chute, the rock was too large to fit through the discharge chute hole. It locked the impeller up shearing the blades off the impeller shaft. The shaft and auger still move, but the blades are broken where the shaft goes through the impeller. I'm hoping there's not any damage to the augers and gearbox.
I have the operator's manual and parts diagram, but I'm not exactly sure how to disassemble it, and would like to know how the auger housing assembly comes apart, rather than just blindly removing bolts hoping to do it correctly. At the very least the impeller is going to need replacing.
Can any of you guide me in the sequence of disassembly so I don't make too much of a mess of this when I take it apart? Here's a link to the manual, the diagrams start on page 24.
I understand that removing the 6 bolts,(#10 on the diagram on page 24), will free up the auger assembly from the auger housing, but how is the worm shaft, (#31 on the diagram on page 24), released from the right angle drive, ( #70 on the diagram on page 25), so the whole auger assembly and worm shaft can be pulled out of the front of the housing? Or, will it pull out the front once the 6 bolts, (#10 on the diagram on page 24), are removed?
http://www.powerequipmentdirect.com/...1_operator.pdf
Thanks so much!
Snyde