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.
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.
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
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.
DO NOT operate the truck on the trolley line if the
truck trolley system is not working correctly.
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