TM  5-4940-228-14 CHAPTER 2 OPERATING INSTRUCTIONS Section  I.    OPERATING  PROCEDURES 2-1. General. Operation of the Model 50-6609 paint spray out- fit  must  be  in  accordance  with  instructions  con- tained in this chapter. Procedures for achieving the type  of  operating  indicated  in  the  following  para- graphs  are  provided  for  operation  under  normal  con- ditions.  For  operation  under  unusual  or  extreme conditions, refer to Section II. 2-2. Preparation for Starting. Before  starting  the  compressor  assembly,  you should prepare it for operation in accordance with the following paragraphs (Fig. 2-1): a. Perform  daily  preventive  maintenance  pro- cedure. (Refer to Chapter 3) b. Place  the  compressor  assembly  on  a  reason- ably  level  area  in  a  well  ventilated,  dust-free  lo- cation. c. Remove engine oil level gage; check oil level. Add oil if necessary. d. Remove  dipstick  from  compressor  and  check oil  level.  Two  marks  are  near  the  end  of  the  dip- stick; correct oil level is when oil on the dipstick is between both marks and the bottom. (Fig. 2-1) Add oil, if below lower mark. NOTE Oil level checks will be in error if com- pressor assembly is not level. e. Check  gasoline  tank  to  be  certain  sufficient gasoline  is  in  the  tank  by  removing  gasoline  tank cap and looking inside. Use regular grade gasoline. f. Keep cart mounted compressor assembly as far as  possible  from  the  painting  operation  so  that paint does not clog the engine and compressor cool- ing fins or filters. WARNING Do not operate the Paint Spray Outfit in an enclosed area unless the exhaust gases  are  piped  to  the  outside.  In- halation of exhaust fumes will result in serious illness or death. g. If both sets of paint spray equipment are to be used, connect both 50 foot lengths of red air hose to air valves on pulsation chamber (Fig. 2-2). Connect opposite ends of red air hoses to each air inlet valve on  the  pressure  (paint)  tanks  (Fig.  2-3).  If  neces- sary, two 50 foot lengths of red air hose can be cou- pled together; this will allow you to move pressure tanks in a 100 foot circle of the compressor. h. Connect one end of each 25 foot length of red air  hose  to  the  air  shutoff  valve  on  each  pressure tank (Fig. 2-3). Connect the opposite end of each red air hose to the air connection on the bottom of each spray gun (Fig. 2-4). i. Connect  one  end  of  each  25  foot  black  fluid hose to the fluid hose connection on each pressure tank (Fig. 2-3), Connect the other end of each black fluid  hose  to  the  fluid  connection  on  the  bottom  of the spray gun head on each spray gun (Fig. 2-4). CAUTION Never use red air hose for fluid. Black fluid hoses have a special lining to re- sist  chemical  properties  of  solvents and thinners. 2-3. Paint Preparation. The Paint Spray Outfit can be used to apply any clean paint of a consistency as used for hand-brush application.  Mix  the  necessary  amounts  of  paint and thinner. Strain the paint through cheese cloth and  pour  into  pressure  tank  insert  pail.  The  pres- sure  tank  is  equipped  with  an  air  motor  agitator which will allow you to stir paint as necessary dur- ing the painting operation. 2-4. Preparation of Respirators. Refer to Figure 2-5 and proceed as follows: a. Remove facepiece (10) from container, remove two  cartridges  (3),  two  prefilters  (2)  and  two  filter covers (1) from plastic bags. b. Place one prefilter on each cartridge and press filter cover over each prefilter and cartridge to hold prefilter in place. c. Screw  both  cartridges  into  facepiece. 2-1