OPERATIONAL PERFORMANCE TEST / Wheel Loader Test PARKING BRAKE FUNCTION CHECK Summary: 1. The function of the parking brake on a determined slope is measured. 2. The braking capability of the brake is an item of safety control. Conduct the performance test correctly. Preparation: 1. Measure the test on a plane slope of 11.31 ° (20 %). 2. Empty the bucket, and hold the bucket at 0.4 to 0.5 m (1’4” to 1’8”) above the ground. 3. Keep hydraulic oil temperature at 50 ± 5 ° C (122 ± 9 ° F). 4. Warm the axle oil by repeating travel and brake operations.
Warm up the engine so that the needle of the in- dicators of the engine coolant temperature gauge and the torque converter oil temperature gauge rise above the horizontal positions. Measurement: 1. Stop the vehicle on the slope, and put the parking brake switch at the P position. 2. Stop the engine. 3. After the vehicle has stopped, put a mark (white line) on the tire and the ground surface respec- tively. 4. After five minutes, measure the distance between the white line of the tire and the ground surface. 5. Repeat measurement three times, and calculate the average values. Evaluation: Refer to Performance Standard Table in Group T4-2.
0.4 to 0.5 m (1’4” to 1’8”) 11.31 ° (20%) T4GB-04-04-003 T4-4-4