OPERATIONAL PERFORMANCE TEST / Component Test MAIN RELIEF SET PRESSURE Summary: Measure the main relief valve set pressure at the de- livery port in main pump. (The main relief set pressure can also be measured by using Dr. ZX.) Preparation: 1. Stop the engine. 2. Push the air bleed valve on top of the hydraulic oil tank and release any remaining pressure. 3. Remove the plug of pressure check port from the main pump delivery port. Install adapter (ST 6069), hose (ST 6943) and pressure gauge (ST 6941). : 6 mm Connect Dr. ZX and select the monitoring func- tion. 4. Start the engine. Confirm that no oil leakage is observed at the pressure gauge connection. 5.
Maintain the hydraulic oil temperature at 50 ± 5 ° C (122 ± 41 ° F). T157-05-04-005 T4-5-9