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OM3006.1 04/98
Operating Instructions
The short-length rating (sometimes called the
''three-minute'' limit) will successfully accommo-
date most downhill loaded hauls. It is necessary
to divide haul road grade segment length by al-
lowable speed to determine actual time on grade.
If actual time on grade exceeds the allowable
amount, the grade will need to be negotiated at
the continuous speed. Ambient temperature, as
well as the prior temperature of the brake cooling
oil can affect this number (the brake cooling oil
could already be above the normal range from
recent operating conditions).
DO NOT exceed these recommended MAXIMUM
speeds when descending grades with a loaded
truck.
For Efficient Retarder Operation, the operator
should:
• Maintain engine RPM between 2000 ---- 2100 RPM,
and
• When descending a grade, the operator should
apply the retarder lever/foot pedal and observe
both the Tachometer and the Brake Oil Tempera-
ture Gauge . The engine RPM must be main-
tained at 2000 -- 2100 RPM and the Brake Oil
Temperature must be maintained below 248
o
(120
C).
If the operator observes that either the maximum
engine speed of 2100 RPM or the Brake Oil Tem-
o
perature of 248
F (120
ceeded, the operator should immediately move
the transmission range selector to the next lower
range and use, either the retarder control lever, or
the foot-operated brake pedal, to apply more
brake pressure until the truck is slowed to a speed
which will permit the transmission to downshift to
the gear range selected.
Continue this procedure to downshift to the re-
quired gear range to maintain engine speed at
2000 -- 2100 RPM and brake oil temperature below
o
o
248
F (120
C). When the proper gear range is
attained, continue to use the retarder as needed
to maintain a safe, productive speed.
If brake oil temperature exceeds 248
the Brake Oil Temperature Warning light will turn
on. As quickly as safety will permit, bring the
truck to a complete stop away from traffic, move
transmission range selector to ''Neutral'', apply
the parking brake, and run engine at high idle.
o
F
o
C) are about to be ex-
o
o
F (120
C),
Continue to run engine at high idle until Brake Oil
Temperature Warning light turns off and brake oil
temperature cools to below 248
perature does not return to this range within a few
minutes, report the condition immediately to
maintenance personnel and wait for further in-
structions before moving truck.
9. When operating truck in darkness or when visibility
is poor, do not move truck unless headlights are
on. Do not back truck if back-up horn or lights are
inoperative.
10. When backing the truck, give back-up signal (three
blasts on horn); when starting forward, two blasts
on horn. These signals must be given each time
the truck is moved forward or backward.
11. Do not stop or park on a haul road unless unavoid-
able. If you must stop, move truck to a safe place,
apply parking brake, shut down engine, block
wheels securely and notify maintenance person-
nel for assistance.
12. If the warning light for ''Low Steering Pressure''
illuminates during operation, steer the truck im-
mediately to a safe stopping area, away from
other traffic, if possible. Refer to item 11 above.
13. Report haul road conditions immediately. Muddy
or icy roads, pot holes or other obstructions can
present hazards.
14. Cab doors should remain closed at all times while
truck is in motion or unattended.
15. Check for flat tires periodically during shift. If truck
has been run on a ''flat'', it must not be parked
in a building until the tire cools.
PASSING
1. Do not pass another truck on a hill or blind curve!
2. Before passing, make sure the road ahead is clear.
If a disabled truck is blocking your lane, slow
down and pass with extreme caution.
3. Use only the areas designated for passing.
Operation - Section 3
Page 3-7
o
o
F (120
C). If tem-
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