5) TRAVEL DEVIATION (1) Measure the deviation by the tracks from a 20 m straight line. (2) Preparation ① Adjust the tension of both tracks to be equal. Provide a flat, solid test yard 20 m in length, with extra length of 3 to 5 m on both ends for machine acceleration and deceleration. Hold the bucket 0.3 to 0.5 m above the ground with the arm and bucket rolled in. Keep the hydraulic oil temperature at 50 ± 5 C . ② 0.3~0.5m ③ ④ 290LC7MS01 (3) Measurement ① Measure the amount of mistracking at high and low travel speeds. Before beginning each test, select the following switch positions. Mode selector :
M mode Start traveling the machine in the acceleration zone with the travel levers at full stroke. Measure the distance between a straight 20 m line and the track made by the machine.(Dimension a) After measuring the tracking in forward travel, turn the upperstructure 180 and measure that in reverse travel. Repeat steps ④ and ⑤ three times and calculate the average values. ② 3~5 m extra length · ③ a 20M 3~5 m extra length ④ ⑤ 45077MS11 ⑥ (4) Mistrack should be within the following specifications. Evaluation Unit : mm / 20 m 7-7 Model Standard Maximum allowable Remarks R800LC-7A 200 below 250