Safety - Section 2 OM2025.1 Page 2-18 General Safety Special Precautions for Working on a 930E Truck Preliminary Procedures before Welding or Performing Maintenance Prior to welding and/or repairing the 930E Dump Truck, maintenance personnel should attempt to notify the Komatsu factory representative. Only qualified personnel, specifically trained for servicing the AC Drive System, should perform this service. If it is necessary to perform welding or repair to the truck without the field engineer present, the following procedures should be followed to ensure that the truck is safe for maintenance personnel to work on and to reduce the chance for damage to equipment.
ANYTIME THE 930E ENGINE IS RUNNING: Do not open any of the cabinet doors or remove any covers. Do not use any of the power cables for hand holds or foot steps. Do not touch the retarder grid elements. Before opening any cabinets or touching a grid element or a power cable, the engine must be shutdown. Normal Engine Shutdown Procedure 1. Stop the truck out of the way of other traffic on a level surface (dry, if possible) and free of overhead power lines or other obstructions (in case dump body should need to be raised). a. Reduce engine speed to idle. Allow engine to cool gradually by running at low idle for 3 to 5 minutes. c.
Apply the Parking Brake switch (13, Figure 3-6, Section 3 - Operation). Be sure the “Parking BrakeApplied” indicator light in the overhead display panel (A3, Figure 3-7, Section 3 - Operation) is illuminated. b. Place the directional Selector Switch (2, Figure 3-4, Section 3 - Operation) in “ N eutral”. 2. Place REST switch (26, Figure 3-6, Section 3 - Operation) in “On” position to put AC Drive System in “REST” mode of operation. Be sure the “REST” indicator light in the overhead panel (B6, Figure 3-7, Section 3 - Operation) is illuminated. 3. With engine cooled down, turn keyswitch (1, Figure 3-6, Section 3 - Operation) counterclockwise to “Off” position for normal shutdown of engine.
If engine does not shutdown with keyswitch, use Engine Shutdown Switch (8, Figure 3-4, Section 3 - Operation) on operator cab center console, and hold this switch down until engine stops. 4. With keyswitch “Off”, and engine stopped, wait at least 90 seconds. Insure steering circuit is completely bled down by turning steering wheel back and forth several times. No front wheel movement will occur when hydraulic pressure is relieved. If the vehicle continues to steer after shutdown, notify maintenance personnel. 5.
Verify that all the LINK VOLTAGE lights are OFF (one on back wall of operator cab, and two on deck control cabinets), and notify maintenance personnel, if any light remains illuminated longer than five minutes after engine shutdown. 6. Close and lock all windows, remove key from keyswitch and lock cab to prevent possible unauthorized truck operation. Dismount truck properly. Put wheel chocks in place.