7) SWING FUNCTION DRIFT CHECK (1) Measure the swing drift on the bearing outer circumference when stopping after a 360 full speed swing. (2) ① Preparation Check the lubrication of the swing gear and swing bearing. Place the machine on flat, solid ground with ample space for swinging. Do not conduct this test on slopes. With the arm rolled out and bucket rolled in, hold the bucket so that the height of the bucket pin is the same as the boom foot pin. The bucket must be empty. Make two chalk marks: one on the swing bearing and one directly below it on the track frame. Swing the upperstructure 360 . Keep the hydraulic oil temperature at 50 ± 5 C .
② ③ 290LC7MS03 ④ ⑤ ⑥ (3) Measurement ① ② · ③ Conduct this test in the M mode. Select the following switch positions. Mode selector : M mode Operate the swing control lever fully and return it to the neutral position when the mark on the upperstructure aligns with that on track frame after swinging 360 Measure the distance between the two marks. Align the marks again, swing 360 , then test the opposite direction. Repeat steps ④ and ⑤ three times each and calculate the average values. ④ ⑤ Drift angle 360 swing ⑥ Swing start & stop 21077MS08 The measured drift angle should be within the following specifications. (4) Evaluation Unit :
Degree 7-9 Model Mode select switch Standard Maximum allowable Remarks R800LC-7A M mode 90 below 112.5