OPERATIONAL PERFORMANCE TEST / Excavator Test DIG FUNCTION DRIFT CHECK Maximum Reach Position Summary: 1. Measure dig function drift, which can be caused by oil leakage in the control valve and boom, arm and bucket cylinders, with the loaded bucket. 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. Load the bucket fully. In lieu of loading the bucket, weight (W) of the following specification can be used. ZAXIS160LC-3: W=900 kg (1984 lb) ZAXIS180LC-3:
W=900 kg (1984 lb) With the arm fully retracted and the bucket fully extended, hold the bucket so that height of the bucket pin is the same as the boom foot pin. 2. Position the arm cylinder with the rod 50 mm (2 in) extended from the fully retracted position. Position the bucket cylinder with the rod 50 mm (2 in) retracted from the fully extended position. 3. Maintain the hydraulic oil temperature at 50 ± 5 ° C (122 ± 41 ° F). Measurement: 1. Stop the engine. 2. Five minutes after the engine has been stopped, measure the change in position of bottom of the bucket, as well as the boom, arm and bucket cylinders. 3. Repeat the measurement 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. Retracted Distance Extended Distance Retracted Distance Same Height Dig Function Drift Amount T105-06-03-021 Arm Cylinder Extension T110-06-03-001 Boom and Bucket Cylinder Retraction T110-06-03-002 T4-4-16 Mark Mark Mark Mark