Special Precautions for Welding on a 930E Truck Preliminary Procedures before Welding or Performing Maintenance 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. Prior to welding and/or repairing the 930E Truck, main- tenance personnel should notify a KMS factory repre- sentative. Only qualified personnel, specifically trained for servicing the AC Drive System, should perform this service. 3. With engine cooled down, turn keyswitch counter- clockwise to “OFF” position for normal shutdown of engine.
If engine does not shutdown with keyswitch, use engine shutdown switch on operator cab center con- sole, and hold this switch down until engine stops. If it is necessary to perform welding or repair to the truck without a field engineer present, the following pro- cedures 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. 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. 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. 5. Verify that all the LINK VOLTAGE lights are “OFF” (one on back wall of operator cab, and two on deck control cabinets). Notify maintenance per- sonnel if any light remains illuminated longer than five minutes after engine shutdown. 6. Close and lock all windows, remove key from key- switch, and lock cab to prevent possible unautho- rized truck operation. Dismount truck properly. Put wheel chocks in place.
Engine Shutdown Procedure before Welding or Performing Maintenance Before opening any cabinets or touching a grid ele- ment or a power cable, the engine must be shut- down and all warning lights “OFF”. Normal operation of the drive system at shutdown should leave the system safe to maintain. However, in the event of a system failure, performing the following procedure prior to any maintenance activities will ensure that no hazardous voltages are present in the AC Drive System. 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 over- head power lines, or other obstructions (in case dump body should need to be raised). 1. Before shutting down the engine, verify the status of all the drive system warning lights on the over- head display panel. Use the lamp test switch to verify that all lamps are functioning properly. a. Reduce engine speed to idle. Allow engine to cool gradually by running at low idle for 3 to 5 minutes.
If any of the RED Drive System warning lights remain ON, do not attempt to open any cabinets, disconnect any cables, or reach inside the retarder grid cabinet without a trained drive system technician present even if engine is shut down. b. Place the F-N-R 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. Only qualified personnel, specifically trained for servic- ing the AC Drive System, should perform this service. FAM0403 930E FIELD ASSEMBLY MANUAL Page 4-7 Field Welding Procedures