OPERATIONAL PERFORMANCE TEST / Component Test SECONDARY PILOT PRESSURE Preparation: 1. Stop the engine. 2. Push the air bleed valve of the hydraulic oil tank and release any remaining pressure. 3. Measure pressure at the location between the pi- lot valve and the main valve. Disconnect the pilot hose in the circuit to be measured. Install hose (9/16-18UNF length: approx. 400 mm) to the signal control valve side. Install a tee and a pressure gauge between the hoses. : 17 mm, 19 mm, 22 mm 4. Start the engine. Check for any oil leaks at the pressure gauge connection. 5. Maintain hydraulic oil temperature at 50 ± 5 ° C (122 ± 9 ° F). Measurement: 1. Set engine speed at fast idle.
Depress the accel- erator pedal fully. 2. Measure pilot pressure by using a pressure gauge with the corresponding control lever oper- ated to full stroke. 3. Repeat the measurement three times and calcu- late the average values. Evaluation: Refer to the Performance Standard Table in Group T4-2. Remedy: Refer to Troubleshooting in Section T5. T4GB-04-05-004 T4-5-3 Pilot Valve Pilo t Hose Signal Co Valve ntrol uge Pressure Ga uge