GASKET 8B8495 - Caterpillar

Illustration 3 g06332007
Trolley system switch
At the designated location, the operator must press the bottom of the trolley system switch. This will lower the pantographs and start the disengage sequence to change over from trolley mode to diesel mode.
As a part of the trolley disengage sequence, the truck speed will decrease and the engine speed will increase to high idle.
The system will switch over to diesel mode once the engine is up to full speed as smoothly as possible.
After the truck is in diesel mode, the pantographs are lowered. The operator can now steer the truck out from under the trolley line.The operator shall follow the procedure for getting off the trolley line in the event an operator is required to get off a trolley line to drive around an obstruction such as rocks or disabled equipment. The operator will then drive around the obstacle and follow the procedure for getting onto the trolley line.
DO NOT touch the pantographs unless the engine is off, the drive system has been de-energized, and grounded per the discharge procedure. Failure to follow these instructions may result in injury or death.
Refer to Electrical Shutdown and Voltage Discharge for information on de-energizing the Power Train Electrical System on the truck.Line Status Signals
Line status signals are recommended to advise operators whether segments of trolley lines are energized and ready to accept traffic. A different status signal light should be used for each section of the trolley line that is energized. The lights are mounted to allow the driver to check the status of the line that the truck is approaching, so that the trolley can be disengaged before a de-energized section of line is reached. Each section of line that is energized by a substation is recommended to have a separate line status signal. Since it is important that a driver press the trolley disengage switch before the truck reaches a de-energized section of ramp, the drivers must constantly monitor the line status signals then press the trolley disengage switch if the line status signals ahead indicates that an approaching section of line is not ready to accept trucks. After proceeding past the section of line, if the next line status signal indicates that the line is ready to accept traffic, the operator should press the trolley engage switch as previously instructed and continue operating on trolley.Trolley Disconnect
Trucks operating on trolley may be rejected from a trolley assist line for several reasons:
System voltage drop - The trolley line is capable of output to a certain rating. If too many trucks are using a section of line at one time, the voltage will drop. The truck system will first reduce the power drawn from the line and the truck will go slower. If the voltage drops below the minimum, the truck will complete the disengage sequence and switch to diesel operation automatically.
No throttle signal - If, at any time while on trolley, the operator releases the throttle pedal, the truck speed will slow down. When truck speed