OPERATIONAL PERFORMANCE TEST / Excavator Test Arm Roll-In Position Summary: 1. Measure dig function drift, which can be caused by oil leakage in the control valve and boom, arm and bucket cylinders. 2. When testing the dig function drift just after cylinder replacement, slowly operate each cylinder for ten minutes to its stroke end and bleed air. Preparation: 1. The bucket must be empty. 2. With the arm fully extended and the bucket fully extended, lower the boom until the arm tip is 1 m (40 in) above the ground. 3. Position the bucket cylinder with the rod 50 mm (2 in) retracted from the fully extended position. 4. Maintain the hydraulic oil temperature at 50 ± 5 ° C (122 ± 9 ° F).
Measurement: 1. Stop the engine. 2. Five minutes after the engine has been stopped, measure the change in position of bottom of the arm tip, as well as the boom, arm and bucket cylinders. 3. Repeat the measuemrent three times and calculate the average values. Evalution: Refer to the Operational Performance Standard in Group T4-2. Remedy: Refer to the Troubleshooting B in Group T5-6. 1 m T173-04-03-001 Cylinder Retraction T110-06-03-002 T4-4-17 Mark Mark