TM 5-3895-383-24 Vibratory System ON Illustration 46 Control Console (4) Amplitude selector. 1. Place     the     amplitude     selector     (4)     in     the     LOW AMPLITUDE position. 2. With the engine at high idle (2350 ± 50 RPM), activate the  vibratory  system.    Observe  the  vibratory  charge pressure at pressure test port (1).  The vibratory charge pressure  should  be  130  ±  70  kPa  (19  ±  10  psi)  lower than the normal operating pressure that was measured in "Vibratory System OFF". 3. Place     the     amplitude     selector     (4)     in     the     HIGH AMPLITUDE   position.      Repeat   Step   2   again.      The charge pressure should have the same value.  This step verifies the movement of the spool in the flushing valve. NOTE: The vibratory charge pressure is controlled by the flushing valve which is located in the motor.  If the charge pressure at test port (1) does not decrease from the pressure that was recorded in "Vibratory System   OFF",   a   problem   may   exist   with   the flushing valve and/or the adjustment of the charge relief valve.  The vibratory charge pressure should be  130   ± 70  kPa  (19    ± 10   psi)   lower   than   the pressure that was recorded in "Vibratory System OFF".      If   the   pressure   decreases   too   much, excessive case leakage may exist or the flushing valve  may  be  improperly  shimmed.    The  nominal stack height of the shims should be 6.5 mm (0.26 inch).  The Testing and Adjusting Vibratory Motor Case   Drain   Flow   -   Test   and   Adjust   should   be performed if the charge pressure is too low. 4. Stop the vibratory system and stop the engine.  Remove all tooling. Main Relief Valve - Test and Adjust SMCS Code:  5069-025-PX; 5069-081-PX Table 8 Required Tools Part Number Description Qty 4C-6500 Digital Thermometer 1 4C-4892 ORFS Fittings Group 1 9U-7400 Multitach 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. 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. NOTICE To  avoid  damage  to  the  vibratory  system  during  testing, always perform the testing with the vibratory drum on top of   tires   or   on   loose   dirt.      Tires   will   simulate   a   non- compacted soil condition. Never  operate  the  vibratory  system  when  the  machine  is on concrete. 11-47