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. Be sure to conduct the perform- ance test. Preparation: 1. Make measurement on a plane slope of 11.31 ° (20 %). 2. Empty the bucket, and hold the lift arm afloat 0.4 to 0.5 m (1’4” to 1’8”) above the ground. 3. Keep the hydraulic oil temperature at 50 ± 5 ° C (122 ± 41 ° F). 4. Warm the axle oil satisfactorily by repeating travel and brake operations.
Make a warm up operation so that the indicators of the engine water temperature monitor and the torque converter oil temperature monitor rise above the horizontal positions. Measurement: 1. Travel up the slope, and put the parking brake switch at the P position. 2. Stop the engine. 3. After the body has stopped, put a mark (white line) on the tire and the ground surface respec- tively. 4. After Five minutes have passed, measure the amount of movement of the white line of the tire from that of the ground surface. 5. 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.
0.4 to 0.5 m (1’4” to 1’8”) 11.31 ° (20%) T4GB-04-04-003 T4-4-4