TM   9-2320-273-20 Item No. 17 18 19 20 Table Interval Semi- Annual Semi- Annual Semi- Annual Semi- Annual 3-1. Unit L Item To Be Inspected Tires Wheel Alignment Parking Brake Trans- mission evel Preventive Maintenance Checks And Service Procedure CAUTION Do not mix radial and bias tires on the same vehicle. Make sure tires are cold when  you  check  pressure. a. Inspect tires for unusual wear, pene- trating objects, and improper matching. b.  Make  sure  all  wheel  Iugnuts  are  in- stalled  and  tightened  to  correct  torque value 450 lb-ft (610 N.m). Check  toe-in  and  adjust  as  necessary. Toe-in should be 1/8 inch (3.2 mm). Inspect spring brake and double air brake and damaged fittings. control  valve,  lines chambers for leaks a. Check transmission to bellhousing bolts for gaps and torques. b. If any bolt shows a gap or is loose, re- move bolt and apply Ioctite; reinstall bolt with flat washer and torque to 55 Ib-ft + or -5 Ib-ft (74.6 N.m + or -6.8 Nm); then pro- ceed to check all the remaining bolts as fol- lows:  Torque  each  bolt  to  50  Ib-ft  (67.8 N.m).  If  bolt  turns  or  has  a  gap,  remove and’  apply  Ioctite,  reinstall washer  and  torque  55  Ib-ft (74.6 N.m + or -6.8 N.m). bolt  and  flat +  or  -  5  Ib-ft M915-M920 Not Mission Capable If: a.   Tires   improperly match. b. Any Iugnut miss- ing   and/or   improp- erly  torqued. Toe-in out of adjust- ment. Air   leaks   or   dam- aged  fittings. 3-10.6   Change   4