FORM 5S1138 MODEL 2Z853C 08942 Maintenance CAUTION: Disconnect wrench from power air supply before servicing. DISASSEMBLY/ASSEMBLY SPECIFICATIONS 1. If  necessary,  heat  motor  housing  (Ref.    No.    1) to, no more than, 250°F to aid removal of motor and clutch assemblies. 2. Coat O.D.  of oil seal (Ref.  No.  16) with a good grade    rubber    cement    and    press    into    motor housing   (Ref.      No.      1)   with   lips   of   oil   seal pointing toward chuck chamber. 3. Press new reverse valve bushing (Ref.   No.  28) in    motor    housing    flush    with    face    of    motor housing,   match   narrow   slot   in   reverse   valve bushing  with  trigger  slot.    Using  a  #19  drill,  drill through  stop  pin  hole  to  allow  stop  pin  to  pass through  wall  of  reverse  valve  bushing.    Ream reverse   valve   bushing   (Ref.      No.      5)   with   a standard 7/16" reamer. 4. Tighten  Allen  Set  Screw  (Ref.    No  27)  In  motor housing to 30-35 inch lbs. 5. Tighten throttle cap (Ref.  No.  24) in valve block to 230-250 inch lbs. 6. Coat O. D of oil seal (Ref.  No.  35) with a  good grade  rubber  cement  and  press  into  front  end plate  (Ref.    No  37)  with  lips  of  oil  seal  toward bearing relief in end plate. 7. Tighten four Allen Cap Screws (Ref.  No.  26) to 55-60 inch lbs. LUBRICATION Daily  before  using  and  before  putting  tool  into  service, pour  about  one  tablespoonful  of  recommended  oil  into air inlet.  An Air Line Lubricator installed at the end of the air  pipe  leading  to  this  pneumatic  tool  is  necessary  to assure  a  constant  and  adequate  supply  of  lubricant  to the motor. At  each  inspection  period,  drain  oil  from  motor  housing and add ¾4 oz.  of recommended clutch oil. At   each   inspection   period,   clean   open   bearings   and repack 25% of free space within bearing with recommended grease. At    each    inspection    period,    clean    clutch    parts    and lubricate splines of shank, hammer cam, and rotor with a molybdenum disulphide lubricant. RECOMMENDED LUBRICANTS Use a turbine or spindle grade oil with a viscosity of 100- 150 S.U.S.  at 1000F which contains a rust inhibitor. A  good  grade  clutch  oil  with  a  viscosity  equivalent  to SAE #30 motor oil is recommended for use in the motor housing. Bearing    Grease    is    recommended    for    use    in    open bearings. Use  a  good  grade  bearing  grease  such  as  Humble  Oil Co's. Andok C grease or equivalent. Bel-Ray Company's Anti-Seize or equivalent is recommended   for   use   on   splines   of   rotor,   cam,   and shank. Notes ORDER REPLACEMENT PARTS THROUGH DEALER FROM WHOM PRODUCT WAS PURCHASED Please provide following information:    Model Number Serial Number (if any) Part Description and Number as shown in Parts List. If dealer cannot supply order from: Dayton Electric Mfg.  Co. Parts Department 5959 W.  Howard St. Chicago, Illinois 60648 -3-