AIR COMPRESSOR - MIDLAND BRAKE MODELS EL-1 300, EL-1 600 REMOVAL AND INSTALLATION WARNING - WHEN ANY COMPONENT IS SER- VICED OR REMOVED FROM THE AIR SYSTEM, BE SURE TO SET   THE   PARKING   BRAKE   AND/OR   BLOCK   THE VEHICLE  TO  PREVENT  IT  FROM  MOV-  ING  WHILE ANY SERVICE IS BEING PERFORMED. REMOVAL 1. Drain air pressure from main reservoir. 2. Drain  engine  cooling  system  and  cylinder  head of compressor if compressor is water-cooled. 3. Disconnect  all  air,  water  and  oil  lines  leading  to and from the compressor. 4. Remove  compressor  mounting  bolts  and  drive belts as required. 5. Remove compressor from engine. 6. Use suitable puller to remove pulley or gear from compressor crankshaft after removing crankshaft nut. 7. Inspect  pulley  or  gear  and  associated  parts  for wear   or   damage.      If   any   parts   are   found   worn   or damaged, they must be replaced. INSTALLATION Installation of compressor is performed by reversing the removal    procedures.        Items    to    be    observed    when reinstalling compressor are: Clean oil supply line so that oil will flow freely through the line. Be sure oil return line or passages through brackets are clean and unrestricted so that oil can return to engine. Always use a new mounting gasket and be sure oil holes in  gasket  and  compressor  are  properly  aligned  with  oil supply line. Inspect drive pulley (gear) for water or damage.  It should fit  securely  on  the  crankshaft,  contacting  the  shaft  only, not    riding    the    key.        Tighten    drive    pulley    nut    to recommended torque, refer to SPECIFICATIONS in this Section. Insure that the air cleaner is clean and properly installed. If   air   intake   is   connected   to   the   engine   air   cleaner, connections should be tight with no leakage. Clean  or  replace  any  dirty,  corroded,  or  damaged  air  or water lines before connecting them to the compressor. Use a new discharge fitting gasket. Align compressor drive and adjust to proper belt tension. Tighten mounting bolts to recommended torque, refer to SPECIFICATIONS in this Section. After compressor is installed, operate it and check for air, oil  or  water  leaks  at  connections.    Be  sure  to  check  for noisy operation. DISASSEMBLY The    air    compressor    crankcase,    cylinder    block    and cylinder    head    are    designed    so    that    these    basic components may be assembled In various ways to meet various  Installation  requirements.    To  guard  against  the parts being assembled incorrectly, these parts should be marked in some manner prior to disassembly. AIR CLEANER Some  compressor  installations  do  not  have  a  separate air cleaner.  These models are equipped with a hose  to the engine air cleaner and only the hose  disconnect  will be required. To  remove  the  air  cleaner,  remove  the  two  bolts  which secure the air cleaner and manifold to the cylinder head. Remove  air  cleaner  and  manifold  as  one  unit  from  air compressor. UNLOADER 1. Bleed  off  main  air  reservoir.    (For  on  vehicle maintenance only.) 2. Remove two hex head unloader cover bolts and cylinder  head  bolt  located  in  center  of  unloader  cover (Figure 3). Figure 3 - Unloader Cover Removal 3. Remove unloader cover.  Unloader seal and end of pin will protrude from head. 4. Remove  unloader  pins  with  seals  and  unloader springs   (Figure   4).      Discard   seals   and   cover gasket. CTS-4077Y - Page 6