OM3070 Operation - Section 30 Operating Instructions Page 30-21 4. The propel direction selector must remain in the forward position and the throttle pedal fully pressed at all times while on trolley. If either is not, the pantograph will lower and the truck will switch back to diesel mode. the truck drifts too far to either side, an auto- matic switch will lower the pantograph, and the truck will switch back to diesel mode. If the operator releases the throttle, the pantograph will lower and the truck will switch back to diesel mode. To be able to return to trolley operation the system must first be reset. 5.
If, while on trolley, something happens to cause the trolley to reject, the pantograph will lower and the truck will return to diesel power. To reset the trolley system, the operator must first move the master control lever to the DIE- SEL position. Then, move the master control lever back to the desired speed position. This starts the on trolley sequence over. The truck must again be over 6 mph before this sequence will be completed. DO NOT operate the truck on the trolley line if the truck trolley system is not working correctly. 6. If the dynamic retarder or the service brakes are used while on trolley, the drive system will auto- matically return to the diesel system.
It will be necessary to reset the trolley system before returning to trolley operation. If the truck speed drops below 3 mph while on trolley, the panto- graphs will lower and the truck will switch back to diesel mode. 7. If an overload condition occurs (i.e. caused by an excessive grade, rolling resistance, or pay- load), the trolley system will trip out in 8 sec- onds. To be able to return to trolley operation the system must first be reset, and truck speed must be greater than 6 mph, and the truck must be properly aligned to go back on trolley. 8. If the pantograph becomes disconnected from the trolley line for any reason, proceed as fol- lows: a.
Move the master control lever to the DIESEL position. b. Allow the pantograph assembly to fully retract. c. Determine the cause of the disconnection. If unsure, stop operation and contact a super- visor. NOTE: If the disconnection is due to misalignment, it is acceptable to re-enter the trolley system. 9. Check for oncoming traffic. Vehicles on the trol- ley line should have right-of-way if possible. d. Align the truck with the trolley navigational aids in the same manner as when entering the line and re-enter the trolley system. e. Move the master control lever to the TROL- LEY mode position and proceed as previ- ously instructed. 10. Drive the truck aligned as instructed previ- ously.
The operator must ensure that the align- ment is correct at all times while operating. If