TM 9-2320-273-20 Item No. 22 Table 3-1. Unit Level Preventive Maintenance Checks And Services M915-M920 Interval Semi- Annual Item To BE Inspected Rear Axles Rear  Axle Spring and Walking Beam Axle   Dif- ferentials (M916/M 920) Front Driving and all Rear Axle  Hous ing Vent Plug Procedure NOTE COLD TEMPERATURE OPERATION For  operation  of  equipment  in  expected continuous temperatures below 0° F (-18° C), remove lubricants prescribed in the key for temperatures above 0° F (-18° C). Re- lubricate  with  lubricants  specified  in  the key for temperatures 0° F to -50° F (-18° C to -46° C). NOTE Pressure gun should be held on fittings until  new  grease  appears.  This  will  as- sure that all the old contaminated grease has been forced out. Take weight off sus- pension  walking  beam  during  lubrication to ensure uniform application of grease into the trunnion bushing. a.  Lubricate  with  GAA  the  Axle  Spring and  Walking  Beam. b.  Check  and  refill  all  axle  differential with  GO  as  required. WARNING Adhesives,  solvents,  and  sealing  com- pounds  can  burn  easily,  can  give  off harmful vapors, and are harmful to skin and  clothing.  To  avoid  injury  or  death, keep away from fire and use in well-venti- lated area. If adhesive, solvents, or seal- ing  compound  get  on  skin  or  clothing, wash immediately with soap and water. c. Remove vent plug from axle housing. Wash vent plug in solvent and allow to air dry. d. Coat threads with pipe thread sealing compound   and   install   axle   housing breather. Not Mission Capable  If: a.   Fitting   will   not purge   old   lubricant out  of  component. c.   Axle   vent   plug missing or cannot be cleaned. 3-10.8   Change   4