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 at- tachment configuration (standard bucket). 3. When measurement is made immediately after the cylinder replacement, conduct air venting of the cylinder before measurement by slowly oper- ating the cylinders to the both stroke ends several times. Preparation: 1. Load the bucket with weight or sand equivalent to the standard load. 4480 kg (9877 lb) 2.
In the front attachment position, extend the lift arm to the maximum reach, and hold the bucket at an angle of about 5 ° declined forward from full crowding. CAUTION: Do not allow any persons to be under the bucket. 1. Keep hydraulic oil temperature at 50 ± 5 ° C (122 ± 9 ° F). Measurement: 1. Stop the engine. 2. After 15 minutes, measure the shrinkage of the lift arm cylinder, shrinkage of the bucket cylinder, and the settlement of the bucket bottom respectively. 3. Repeat the measurement three times and calcu- late the average values. Evaluation: Refer to Performance Standard Table in Group T4-2. Remedy: Refer to Trouble Shooting in Section T5.
T4GB-04-04-014 A B T4GB-04-04-015 T4-4-10 Bucket Cylinder Lift Arm Cylinder urement of ment Meas Settle urement of ment