OPERATIONAL PERFORMANCE TEST / Component Test SECONDARY PILOT PRESSURE Preparation: 1. Stop the engine. 2. Push the air bleed valve on top of the hydraulic oil tank and release any remaining pressure. 3. Measure pressure at the location between pilot valve and main valve. Remove the pilot hose to be measured. Install the 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 the hydraulic oil temperature at 50 ± 5 ° C (122 ± 41 ° 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 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