SYSTEM PRESSURE REGULATOR RELIEF SETTING 17) (1) Preparation ① ② Stop the engine. Remove the top cover of the hydraulic tank oil supply port with a wrench. Push the pressure release button to bleed air. To measure the system relief pressure. Install a connector and pressure gauge assembly main pump gauge port, as shown. Start the engine and check for oil leakage from the port. Keep the hydraulic oil temperature at 50 ± 5 C . ③ ④ a2 ⑤ a1 ⑥ (2) Measurement ① Select the following switch positions. · Mode selector : M mode Slowly operate each control lever of boom, arm and bucket functions at full stroke over relief and measure the pressure.
In the swing function, place bucket against an immovable object and measure the relief pressure. In the travel function, lock undercarriage with an immovable object and measure the relief pressure. ② ③ 8007A7MS04 ④ (3) Evaluation The average measured pressure should be within the following specifications. Unit : kgf / cm 2 ( ) : Power boost 7-20 Model Function to be tested Standard Port relief valve setting R800LC-7A Boom, Arm, Bucket 330(360)±10 390±10 Travel 350±10 - Swing 285±10 -