TM 5-3895-383-24 Illustration 80 Drum Drive Motor (1) Brake line.  (2) Case drain line. 1. Remove brake line (1) from the drum drive motor.  Plug the brake line and cap the fittings. 2. Install    the    4C-6500    Digital    Thermometer    into    the hydraulic  oil  tank.    The  hydraulic  oil  temperature  must be 38C (100F) for proper test results. 3. Disconnect   case   drain   line   (2)   from   the   drum   drive motor.  Install 9X-2350 Hose and  4C-8689  Flow  Meter to the drum drive motor.  This allows the leakage oil to flow  from  the  drive  motor  through  the  flow  meter  and into case drain line (2). 4. Install  two  51710  kPa  (7500  psi)  pressure  gauges  on the pressure test ports for the drum propel pump. NOTICE To prevent overheating of the hydraulic oil and damage to the propulsion system components, do not run each test longer than 30 seconds. 5. Start the engine.  Run the engine at high idle. 6. Set   the   speed   range   switch   to   the   HIGH   SPEED position. 7. With the propel control lever in NEUTRAL position, read the amount of oil that is flowing through the flow meter. The oil flow should be less than 1 gpm. 8. Release the parking brake. 9. Slowly move the propel control lever in the FORWARD position.  When the pressure reaches 10342 kPa (1500 psi), the maximum allowable oil flow is 3.8 gpm. 10. Repeat   Step   9   four   times.      Rotate   the   drum   for 90 after each reading. 11. Repeat Steps 7 through 9 while the propel control lever is in REVERSE position. 12. If  the  leakage  is  more  than  3.8  gpm,  the  drum  drive motor  and/or  the  flushing  valve  should  be  repaired  or replaced. 13. Remove the caps and the plugs.  Reconnect brake line (1) to the drum motor. Piston Motor Case Leakage (Axle Propel) - Test SMCS Code:  4351-Q81-FW Table 18 Required Tools Part number Description Quantity 4C-8689 Flow Meter 1 9-2350 Hose (36 inches) 2 Digital 4C-6500 Thermometer 1 7X-1449 Orifice Fitting 1 7X-1447 Orifice Fitting 1 6V-9829 Cap 1 6V-8552 Nut 1 Personal Injury or death can result from sudden machine movement. Sudden  movement  of  the  machine  can  cause  injury  to persons on or near the machine. To prevent injury or death, make sure that the area around the machine is clear of personnel and obstructions before operating the machine. 10-74