A bearing support frame is disposed within a rear end portion of {HEAD ~ a tractor front housing} having {TAIL ~ an open rear end} 
having
A bearing support frame is disposed within a rear end portion of { HEAD ~ a tractor front housing } having { TAIL ~ an open rear end }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL