(8) Straighten bent or dented panel. (9) Replace all parts that are worn or damaged to   an   extent   that   will   impair   their   normal function. e. Assembly.    To  assemble  the  instrument  panel assembly, proceed as follows: (1) Insert indicator (43, Figure 8-8) through the back  of  the  panel  (44),  assemble  indicator cap on indicator and tighten. (2) Insert push button (42) through the back of the  panel  (44),  install  push  button  cap  and tighten adjusting nut. (3) Remove   retaining   nut    and    washer    from unloader  switch  (39),  insert  the  switch  into panel (44) from the back, install flat washer and retaining nut.  Tighten nut. (4) Remove   the   handles   and   locknuts   from hand  valves  (29,  33  and  37).    Be  sure  flat washers are in place and insert hand valves through  the  panel  from  the  back.    Attach locknuts and handles. (5) Connect tube assembly (17) at tee (27) and tube assembly (5) at tee (31). (6) Connect    service    valve    to    service    hose bleed valve tube assembly (23). (7) Remove  locknut  from  master switch (21). Insert  switch  through  back   of   panel   (44), attach locknut to switch (21) and tighten. (8) Install  start  switch  (20)  in  panel  (44)  using nuts (19) and screws (18). (9) Assemble   wire   assembly   (17)   to   starter switch (20). (10)   Install service outlet (16) in panel (44) using nut (15).  Tighten nut. (11)   Connect service outlet to service valve tube assembly (14) at service outlet (16). (12)   Insert  the  compressor  pressure  gauge  (3), service pressure gauge (6), compressor oil pressure gauge (8) and engine oil pressure gauge in to panel (44).  Attach clamps and nuts to each gauge. (13)   Connect   the   service   pressure   to   service outlet tube assembly (5) at service pressure gauge elbow (7). (14)   Install ammeter (2) into panel (44), attach to panel with mounting clamps and nuts. (15)   Install   hourmeter   (1)   into   panel   (44)   with mounting clamp and nuts. 6-12. Rupture  Disc  Assembly  (See  Figure  8-9).    The following    paragraphs    contain    disassembly,    cleaning, inspection, repair or replacement and assembly instructions for the rupture disc assembly. a. Disassembly.        Disassemble    the    rupture    disc assembly   only   to   the   extent   necessary   to   repair   or replace a defective part or parts. (1) Remove  rupture  disc  base  (8)  from  body (10).  Remove cap nut (9) from rupture disc base  (8)  and  remove  washer  and  rupture disc. (2) Remove  connectors  (5),  elbows  (4,  7)  and straight tee (6). b. Cleaning.  Refer to paragraph 6-3.a.  for general cleaning procedures. c. Inspection.  Refer to paragraph 6-3.b for general inspection procedures. d. Repair  or  Replacement.    Refer  to  paragraph  6- 3.c for general repair or replacement procedures. e. Assembly.        To    assemble    the    rupture    disc assembly, proceed as follows: (1)   Install   straight   tee   (6),   elbows   (7,   4)   and connectors (5) to body (10). (2) If  rupture  disc  and  washer  were  removed from the disc base (8) install and assemble cap  nut  (9)  to  disc  base  (8).    Install  disc base (8) in body (10). 6-13. Air     Cooler     Group     (See     Figure     8-10.)     The following    paragraphs    contain    disassembly,    cleaning, inspection repair or replacement and assembly instructions for the air cooler group. a. Disassembly.  Disassemble  the  air  cooler  group only   to   the   extent   necessary   to   repair   or   replace   a defective part or parts. 6-14