TRUCK SERVICE MANUAL TM 5-4210-230-14&P-1 BODIES AND CABS COMPRESSOR IMPORTANT Compressor removal and installation procedures vary between engine and vehicle models.  General instructions are outlined below. Removal: 1. Raise hood and fender assembly. 2. Discharge  air  conditioning  system  as  outlined  under SERVICE OPERATIONS. 3. Remove drive belt(s). 4. Disconnect   magnetic   clutch   feed   wire   from   engine wiring harness. 5. Disconnect  inlet  and  outlet  hoses  from  compressor. Cap   or   tape   compressor   and   hose   openings   to prevent entry of foreign material. 6. Remove    bolts    securing    compressor    to    mounting bracket(s). 7. Remove compressor from mounting bracket. IMPORTANT For compressor service instructions, refer to Body and Cabs, Section CTS2577 of the Truck Service Manual. Installation: 1. Check   oil   level   in   compressor   as   outlined   under SERVICE OPERATIONS. 2. Position   compressor   on   mounting   bracket(s)   and install   mounting   bolts.      (Do   not   tighten   mounting bolts.) 3. Install drive belt(s). 4. Check  drive  belt  alignment  and  tighten  compressor mounting bolts. 5. Adjust drive belt(s) to specified tension (see SPECIFICATIONS). 6. Lubricate fittings with refrigerant oil and connect inlet and outlet hoses to compressor. 7. Connect  magnetic  clutch  feed  wire  to  engine  wiring harness. 8. Evacuate   and   charge   air   conditioning   system   as outlined under SERVICE OPERATIONS. 9. Lower hood and fender assembly. Fig. 41 Compressor Mounting (Typical) COMPRESSOR MAGNETIC CLUTCH On   most   applications   the   magnetic   clutch   can   be removed    for    service    without    discharging    the    system    or removing the compressor from the engine. Removal: 1. Make sure key switch and A/C lever are "OFF". 2. Disconnect    clutch    feed    wire    from    engine    wiring harness. 3. Loosen  compressor  drive  belt  tension  and  remove belt(s) from clutch pulley. Inspect drive belt(s) and replace if worn or damaged. 4. Using   spanner   wrench   (SE-2392-4)   to   hold   clutch hub, remove clutch retainer bolt (Fig.  42). 5. Thread  5/8-11  remover  bolt  (SE-2392-5)  into  clutch drive   hub.      Tighten   remover   bolt   against   end   of compressor   crankshaft   to   loosen   clutch.      Remove clutch assembly and drive key from crankshaft. 6. Remove    mounting    bolts    and    remove    field    coil assembly     (or     stationary     brush     assembly)     from compressor body. CTS-2731  Page 27 PRINTED IN UNITED STATES OF AMERICA