TM 5-3895-383-24 3. Check  all  oil  lines,  all  hoses,  and  all  connections  for damage and for leaks.  Look for oil on the ground under the machine. NOTE: If   oil   can   leak   out   of   a   fitting   or   out   of   a connection,  air  can  leak  into  the  system.    Air  in the system is as harmful as having too little oil. Propel System Troubleshooting SMCS Code:  3000-035 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. Personal injury can result from hydraulic oil pressure and hot oil. Hydraulic oil pressure can remain in the hydraulic system after the engine has been stopped.  Serious injury can be caused if this pressure is not released before any service is done on the hydraulic system. Make sure all of the attachments have been lowered, oil is cool  before  removing  any  components  or  lines.    Remove the oil filler cap only when the engine is stopped, and the filler cap is cool enough to touch with your bare hand. NOTICE Care  must  be  taken  to  ensure  that  fluids  are  contained during  performance  of  inspection,  maintenance,  testing, adjusting and repair of the product.  Be prepared to collect the   fluid   with   suitable   containers   before   opening   any compartment or disassembling any component containing fluids. Refer to Special Publication, NENG2500, "Caterpillar Tools and Shop Products Guide" for tools and supplies suitable to collect and contain fluids on Caterpillar products. Dispose  of  all  fluids  according  to  local  regulations  and mandates. Operational Checks NOTE: The checks during operation can be used to find leakage in the system.  These checks can also be used  to  find  a  bad  valve,  a  bad  pump,  or  a  bad motor.    Travel  speed  can  be  used  to  check  the condition of the propel motors and the pump. Operate the machine in each direction and in all speeds. Watch the drum and the wheels. Starting and stopping operations should be progressive. The drum and the wheel rotation should be normal at all times. Check for noise from the pump and drive motors. Check   for   the   second   of   the   relief   valves   that   are opening.  The opening pressures of the relief valves are given in Propel Pump Relief Valve -Test and Adjust and Charge Relief Valve -Test and Adjust of this module. After  selecting  the  travel  speed  of  the  compactor,  the forward and reverse motion should be identical. Probable Causes of Problems in the Propel System Problem The propel system engages very slowly when the operator is attempting to shift. Probable Cause Low charge pressure. The orifices in the piston pumps are plugged. The oil is too viscous and/or the oil is too cold. The charge filter is plugged. The hydraulic oil level is low. The control valve is malfunctioning. 10-58