OPERATIONAL PERFORMANCE TEST / Wheel Loader Test CYLINDER DRIFT CHECK Summary: 1. Internal leakage of the lift arm, bucket cylinders, and control valves when the buket is loaded with load equivalent to the standard load is judged by the settlement (shrinkage) of the cylinder rod. 2. Measurement is made in the standard front con- dition (standard bucket). 3. In case measurement is made immediately after the cylinder replacement, conduct air venting of the cylinder before measurement by operating the cylinders slowly to the stroke ends several times. Preparation: 1. Load the bucket with weight or sand equivalent to the standard load ZW220: 7180 kg (15829 lb) ZW250: 6400 kg (14109 lb) 2.
In the front position, extend the lift arm to the maximum reach, and hold the bucket at an agle of about 5 ° declined forward from full crowding. CAUTION: Never allow any personnel to be under the bucket. 1. Keep the hydraulic oil temperature at 50 ± 5 ° C (122 ± 41 ° F). Measurement: 1. Stop the engine. 2. After 15 minutes have passed, measure the shrinkage of the lift arm cylinder, shrinkage of the bucket cylinder, and the settlement of the bucket bottom respectively. 3. Make measurement three times, and determine the measurement value by obtaining their mean values. Evaluation: Refer to the Performance Standard Table in Group T4-2. Remedy: Refer to the Trouble Shooting in Section T5.
T4GB-04-04-014 B A T4GB-04-04-015 T4-4-10 Bucket Cylinder Lift Arm Cylinder urement of ment Meas Settle urement of ment