SECTION V. MAINTENANCE INSTRUCTIONS 5-1. GENERAL. This section contains organizational and intermediate maintenance instructions for the air compressor unit. 5-2. OPERATIONAL        CHECKOUT.        Operational checkout of the air compressor unit consists of operating the   unit   and   observing   instrument   panel   meter   and gauge  indications.    Correct  instrument  panel  meter  and gauge  indications  are  listed  in  Table  5-  1.    To  perform operational checkout, proceed as follows: a. Make  certain  CLUTCH  operating  rod  (11, Figure 4-2) is in disengaged position, away from  control panel. b. Make  certain  COMPRESSOR  UNLOADER switch   (16)   is   in   the   UNLOAD   position   and   close   all control panel valves. c. Make  certain  ENGINE  THROTTLE  control (10), is positioned half way in (idle position 1,100 ± 100 rpm [1,100 ± 100 r/min] ). d. Turn   MASTER   SWITCH   (9)   to   45°   cw position. CAUTION If  engine  oil  pressure  does  not  register on gauge within five seconds, immediately    shut    down    engine    and determine cause. Refer to Troubleshooting (Section V). e. Push   engine   START   switch   (8).      When engine   starts   continue   to   hold   START   switch   until ENGINE OIL PRES- SURE    gauge    (6)    registers    pressure;    then,    release START switch. f. After   engine   is   running,   allow   engine   to warm  up  a  minimum  of  5  minutes  at  1,100  ±  100  rpm (1,100 ± 100 r/min). g. After   engine   is   warm,   engage   clutch   by pushing  clutch  handle  toward  panel  with  a   hard   fast thrust. CAUTION If   compressor   oil   pressure   does   not register   within   5   seconds,   shut   down engine, and  determine  cause.    Refer  to TROUBLESHOOTING (Section V). h. Pull  engine  THROTTLE  CONTROL  to  the full out position and lock by  turning  handle  in  clockwise direction  until  snug.    COMPRESSOR  OIL  PRESSURE GAUGE   (5)   should   register   oil   pressure   within   five seconds. WARNING Make certain all control valves on control panel are closed. i. Place  COMPRESSOR  UNLOADER  switch to LOAD position.  This function  allows  the  compressor to furnish breathable air to the receiver @ 3200 psi. j. Observe high pressure gauge (4) indication. With    air    compressor    unit    operating    under    normal conditions, Table 5-1.  Instrument Panel Meter and Gauge Indication METER OR GAUGE INDICATION AIR SERVICE PRESSURE 3200 psi (22,048 kPa) 4TH STAGE PRESSURE @ MECHANICAL FILTER 3200 ± 25 psi (22,048 ± 170 kPa) COMPRESSOR OIL PRESSURE 25 ± 5 psi (172 ± 35 kPa) ENGINE OIL PRESSURE 60 ± 10 psi (413 ± (0.9 kPa) AMMETER 2 + 38 AMPERES 5-1