6) SWING SPEED (1) Measure the time required to swing three complete turns. (2) Preparation ① 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. Keep the hydraulic oil temperature at 50 ± 5 C . ② ③ ④ (3) Measurement 290LC7MS03 ① · ② ③ Select the following switch positions. Mode selector : M mode Operate swing control lever fully. Swing 1 turn and measure time taken to swing next 3 revolutions.
Repeat steps ② and ③ three time and calculate the average values. ④ (4) The time required for 3 swings should meet the following specifications. Evaluation Unit : Seconds / 3 revolutions 7-8 Model Power selector switch Standard Maximum allowable R800LC-7A H mode 28.6±1.5 35.8