Safety - Section 20 OM2030 Page 20-18 SPECIAL PRECAUTIONS FOR WORKING ON A 930E TRUCK Preliminary Procedures Before Welding or Performing Maintenance Prior to welding and/or repairing a 930E dump truck, maintenance personnel should attempt to notify a Komatsu service representative. Only qualified personnel, specifically trained for servicing the AC Drive System, should per- form this service. If it is necessary to perform welding or repair to the truck without the field engineer present, the following proce- dures 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 ENGINE IS RUNNING:
Do not touch the retarder grid elements. Normal Engine Shutdown Procedure a. Reduce engine speed to idle. Allow the engine to cool gradually by running at low idle for approx. 5 min- utes. b. Place the directional selector switch in NEUTRAL. c. Apply the parking brake switch. Be sure the “parking brake applied” indicator light in the overhead display panel is illuminated. 2. Place rest switch in ON position to put AC drive system in “rest” mode of operation. Be sure the “rest” indicator light in the overhead panel is illuminated. 3. With engine cooled down, turn keyswitch counterclockwise to OFF position for normal shutdown of engine.
If the engine does not shutdown with keyswitch, use engine shutdown switch 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 the steering circuit is completely bled down by turning the 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 per- sonnel. 5. Verify that all the link voltage lights are off (one on back wall of operator cab, and two on deck control cabi- nets).
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 the cab to prevent possible unauthorized truck operation. Dismount the truck properly. Put wheel chocks in place. o e m ors or remove any covers. s for hand holds or foot steps. ents. ing a grid element or a power cable, the engine m ts must not be illuminated. her traffic on a level surface (dry, if possible) and free o dump body should need to be raised). ch h t ing a grid element or a power ca ts must not be illuminated. her traffic on a level surface (dry, if e