Operational Checkout Procedure TM2361 (24JUN08) 9005-10-21 450DLC Excavator Operation and Tests 062608 PN=237 Swing Priority Circuit Check CAUTION: Perform check in an open area away from other machinery or personnel. T6290AF –UN–19OCT88 TX1000170 –UN–10NOV05 1—Engine Speed Dial 2—Auto-Idle Switch 3—Power Mode Switch Position machine as shown. Turn engine speed dial (1) to H (fast idle) position. Turn power mode switch (3) to P (power) mode. Operate swing function and record time required for three complete revolutions. Divide that time by three to get an average time for one revolution. Specification Swing Function—Time—One Revolution..........................................
6.17—7.17 seconds IMPORTANT: Position machine as shown. Operate swing and arm in slowly a few times before attempting to perform check to ensure bucket does not contact machine or ground. Position machine as shown, arm extended, bucket curled, and upper structure 90 degrees to tracks. Turn engine speed dial (1) to H (fast idle) position. Turn power mode switch (3) to P (power) mode. Raise boom high enough so bucket does not contact the machine or ground during arm in and swing combined operation. Operate swing function and slowly actuate arm in function when upperstructure is in line with tracks. Record time required for one complete revolution. NOTE:
Swing speed should not slow when actuating arm in. LOOK: Does swing speed remain unchanged when actuating arm in? YES: Go to next check. NO: Check arm 1 flow rate pilot valve. See Diagnose Swing Circuit Malfunctions (Group 9025-15.) and see Pilot Signal Manifold Operation (Group 9025-05.) and see Arm 1 (Swing Priority) Flow Rate Circuit Operation. (Group 9025-05.) – – –1/1 9005 10 21