Operating In Diesel Mode; Operating In Trolley Line Mode - Komatsu 730E Operation & Maintenance Manual

Operation - Section 30
Page 30-18

OPERATING IN DIESEL MODE

Operating a truck equipped with trolley assist is
nearly identical to operating a standard truck.
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.
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.
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.
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 O is required. The operator may see short
2
drops in the reading, but any drops lasting more
than a few seconds require immediate shut-
down and repair.
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.

OPERATING IN TROLLEY LINE MODE

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.
All recommendations for diesel operation apply for
trolley operation with the addition of the following rec-
ommendations:
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.
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.
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.
OM3070
Operating Instructions