TM 10-3930-664-10 driveshaft for attachment to the front axle. (9)   Install the driveshaft onto the front axle.  Torque the driveshaft attaching bolts to 75 lb-ft. (10) Store the park brake lockout in the driveshaft retainer and secure with the fastener. (11) Rotate the steering by-pass valve handle one-quarter turn to the closed position.  In closed position valve handle is perpendicular to the valve. CAUTION Do  not  attempt  to  engage  the  axle  disconnect  while  the  4KRTFL  is  stopped.    Drive  the  4KRTFL  slowly forward while pulling the axle disconnect lever upward. (12) Pull REAR AXLE DISCONNECT lever upward to engage the rear axle for normal operations. 2-27. NUCLEAR, BIOLOGICAL AND CHEMICAL (NBC) DECONTAMINATION. If NBC contamination is suspected, contact your NBC officer or NBC NCO for decontamination procedures. NOTE Paragraph 2-28 applies only to Model MHE-271. 2-28. SIDE WINDOW EMERGENCY EXIT. The right side window can be used as an emergency exit when exit through the cab door cannot be made.  To open the emergency exit, proceed as follows: a. Open window by turning inside handle to release window. b. Push the window out. c. Exit can be made by crawling out the window. 2-54