8) SWING BEARING PLAY (1) Measure the swing bearing play using a dial gauge to check the wear of bearing races and balls. (2) ① Preparation Check swing bearing mounting cap screws for loosening. Check the lubrication of the swing bearing. Confirm that bearing rotation is smooth and without noise. Install a dial gauge on the track frame as shown, using a magnetic base. Position the upperstructure so that the boom aligns with the tracks facing towards the front idlers. Position the dial gauge so that its needle point comes into contact with the bottom face of the bearing outer race. Bucket should be empty.
② ③ ④ 45077MS12 ⑤ ⑥ (3) Measurement ① With the arm rolled out and bucket rolled in, hold the bottom face of the bucket to the same height of the boom foot pin. Record the dial gauge reading(h1). Lower the bucket to the ground and use it to raise the front idler 50 cm . Record the dial gauge reading(h2). Calculate bearing play(H) from this data(h1 and h2) as follows. H=h2-h1 Measurement : (h1) ② Measurement : (h2) ③ The measured drift should be within the following specifications. (4) Evaluation 290LC7MS04 Unit : mm 7-10 Model Standard Maximum allowabl e Remarks R800LC-7A 0.5 ~ 1.5 3.0