Air  in  the  system  can  also  cause  fluid  level  to rise,  especially  after  system  repair.    Bleed  the system    as    described    in    the    MAINTENANCE section of this chapter. 2. Replace reservoir. 3. Replace reservoir gasket seal. 4. Tighten   fitting   to   specified   torque.      If   leakage persists, replace O-ring seal. If  either  the  return  hose  or  the  pressure  hose leaks, other than at the nut connections, replace the hose. 5. Replace   drive   shaft   seal   after   inspecting   and thoroughly cleaning the sealing surface. Replace  drive  shaft  if  severe  wear  is  found  at sealing locations.  If the corrosion in the lip seal contact  zone  is  slight,  clean  the  surface  of  the shaft with crocus cloth.  Always replace the seal if the shaft is replaced. On   certain   Cummins   direct   drive   applications, leaks in this area will cause  migration  of  engine oil  into  the  pump.    If  the  seal  does  not  appear excessively hardened, correct excessive pressure condition in the engine pump mounting area    cavity.        Modification    to    the    engine    is required. 6. Clean  all  gasket  surfaces  removing  old  gasket material and replace with new O-ring seal. INSTALLATION AND REMOVAL INSTALLATION Belt Driven Pump 1. If   removed,   reinstall   pump   mounting   bracket. Tighten mounting bolts to specified torque. 2. Position  pump  assembly  on  engine  with  holes lined up and install bolts loosely. 3. Install pulley.  Insure that key remains in groove to  avoid  seal  damage.    Install  pulley  retaining bolt finger tight. 4. Connect   and   tighten   hose   fittings   to   specified torque. 5. Fill   reservoir.      Bleed   pump   by   turning   pulley backward    (counter-clockwise    as    viewed    from front) until air bubbles cease to appear. 6. Install pump belt over pulley. 7. Adjust  belt  tension  and  tighten  pump  mounting bolts  to  specified  torque.    See  BELT  TENSION and BELT ADJUSTMENT. 8. Tighten pulley retaining bolt to specified torque. 9. Bleed  system  per  FLUID  LEVEL  section  of  this manual. Gear Driven Pump 1. Remove  any  existing  gasket  material  from  the pump mounting flange and corresponding engine   mounting   surface.      Mount   pump   and reservoir assembly and accessory drive coupling on    engine    using    a    new    gasket.         Tighten mounting bolts to specified torque, 2. Connect   and   tighten   hose   fittings   to   specified torque. 3. Fill    reservoir    and    bleed    system    per    FLUID LEVEL section of this manual. REMOVAL Belt Driven Pump 1. Disconnect both hoses at pump, taking care not to     bend     hoses     any     more     than     absolutely necessary.               (With     time     and     temperature exposure,  hoses  may  take  a  "set"  and  will  not have  the  flexibility  of  a  new  hose).    When  both hoses  are  disconnected,  secure  ends  in  raised position  to  prevent  drainage  of  oil.  Protect  hose ends to avoid contamination of system. 2. Install   caps   at   both   pump   fittings   to   prevent drainage of oil from pump. 3. Loosen    pulley    retaining    bolt.        Then    loosen bracket mounting bolts to relieve belt tension. 4. Remove belt and pulley. 5. If  pump  is  to  be  disassembled,  remove  pump and mounting bracket as an assembly.  If pump is not to be disassembled, the mounting bracket may remain attached to the engine. Gear Driven Pump 1. Disconnect both hoses at pump, taking care not to     bend     hoses     any     more     than     absolutely necessary. (With time and temperature exposure,  hoses  may  take  a  "set"  and  will  not have  the  flexibility  of  a  new  hose).    When  both hoses  are  disconnected,  secure  ends  in  raised position  to  prevent  drainage  of  oil.  Protect  hose ends to avoid contamination of system. 2. Install   caps   at   both   pump   fittings   to   prevent drainage of oil from pump. 3. Remove   mounting   flange   to   engine   bolts   and remove pump assembly with flange from vehicle. CTS-4027 - Page 8