Operation - Section 30 OM3070 Page 30-18 Operating Instructions OPERATING IN DIESEL MODE Operating a truck equipped with trolley assist is nearly identical to operating a standard truck. Only trucks that are loaded will travel on the trolley line. Trucks operating on trolley will have a faster speed than when operating on diesel. Because of the faster speed, all safety and warning recommenda- tions must be followed very closely. OPERATING IN TROLLEY LINE MODE The following are items that differ with trolley assist: 1. Reduced dynamic retard rpm setting.
Trolley equipped haul trucks have the dynamic retard setting reduced to 1250 rpm as compared to 1650 rpm on a similar haul truck not equipped to for trolley assist. All recommendations for diesel operation apply for trolley operation with the addition of the following rec- ommendations: Haul trucks not equipped with trolley assist require 1650 rpm to provide adequate wheel motor cooling, because the wheel motor cooling fan is driven by the alternator at engine speed. 1. Loaded trucks operating on diesel will not be as fast as loaded trucks that are on trolley. 2.
If there is something in the path of a truck while on trolley, and it is necessary to go around it, the truck will have to drop off the trolley and use diesel power. After driving around the object, the truck can return to trolley. On a trolley equipped truck, the fan that pro- vides wheel motor cooling is driven by a hydraulic motor. Hydraulic pressure for this motor is adequately produced at all engine speeds. Therefore, on trolley equipped trucks, 1250 rpm is adequate to produce effective dynamic retarding, and the higher engine speed is no longer required to produce adequate wheel motor cooling. Always keep the pantographs stowed in the low- ered position when not in use on trolley.
Never drive near or under the trolley lines with raised pantographs unless the truck is properly aligned with the trolley line. If this procedure is not fol- lowed, pantograph and line damage will occur. 2. The magnehelic gauge (if equipped) monitors the amount of air flow being provided to cool the wheel motors. A reading between 4.5 - 6.5 in. H 2 O is required. The operator may see short drops in the reading, but any drops lasting more than a few seconds require immediate shut- down and repair. 3. Trolley-assist is to be used for loaded uphill haul only. Trucks must have the dump body at least half loaded, or more, before going uphill on trolley.
Empty trucks are not to go uphill on trolley. 3. Getting on the trolley. If a haul truck is unable to get on trolley, the operator will continue up the ramp in the diesel mode, and contact the super- visor immediately describing the problem encountered. 4. The Statex III w/Fuel Enhancement system monitors wheel motor, ambient, and static exciter temperatures. If any one of these values is outside the limits established, the Statex III controls will cause the engine to increase to 1650 rpm. (Normal engine rpm for haul road/ retarding operation is 1250 rpm.) 5.
When truck speed limit (maximum truck speed in diesel mode) is reached, haul trucks equipped with the Statex III w/Fuel Enhance- ment system will experience a decrease in engine rpm. NOTE: This is different from trucks equipped with Statex II or Statex III without Fuel Enhancement, which increase rpm upon reaching speed limit.