TM 5-3895-383-24 Pressure Override Relief Valve - Test and Adjust SMCS Code:  5117-025; 5117-081 Table 16 Required Tools Part Number Description Quantity 8T-0861 Pressure Gauge 1 60000 kPa (8700 psi) 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,   NEN   G2500,   "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 of all fluids mandates. Before    you    conduct    the    test    procedure    on    the    pressure override relief valve (POR valve), the following steps must be followed: Make sure that the parking brake is applied. Place the propel control lever in NEUTRAL position. Place the machine in position against a solid, stationary object  such  as  a  loading  dock.    The  wheels  and  the drum  may  be  blocked  instead  of  placing  the  machine against a stationary object. NOTE: Follow  the  same  test  procedure  and  the  same adjustment  procedure  for  the  POR  valves  on  the axle propel pump and the drum propel pump. Illustration 78 Drum Drive Motor (1) Brake line. 1. Remove brake line (1) from the drum drive motor.  Plug the brake line and cap the fittings. 10-72