Operating On A Haul Road - Komatsu 930E-4SE Operation & Maintenance Manual

Operating Instructions - Section 30
Page 30-12
• Match the truck speed to haul road conditions.
Slow down the truck in congested areas. Keep a
firm grip on the steering wheel at all times.
• Do not allow the engine to run at idle for
extended periods of time.
• When the truck body is in the dump position, do
not allow anyone beneath it unless the body-up
retaining pin or cable is in place.
Do not use the brake lock or the emergency
brake (if equipped) for parking. With the engine
stopped, hydraulic pressure will bleed down,
allowing the brakes to release.
• Check the brake lock performance periodically
for safe loading and dump operation.
• Proceed slowly on rough terrain to avoid deep
ruts or large obstacles. Avoid traveling close to
soft edges or the edge of a fill area.
• Do not drive over unprotected power cables.
• Truck operation requires concentrated effort by
the driver. Avoid distractions of any kind while
operating the truck.
OPERATING ON THE HAUL ROAD
1. Always stay alert! If you are unfamiliar with the
road, drive with extreme caution. The cab doors
should remain closed at all times if the truck is
in motion or unattended.
2. Obey all road signs. Operate the truck so it is
under control at all times. Govern the truck
speed by the road conditions, weather, and
visibility. Report poor haul road conditions
immediately. Muddy or icy roads, pot holes, or
other obstructions can present hazards.
3. Initial propulsion with a loaded truck should
begin from a level surface whenever possible. If
there are circumstances where starting on a hill
or grade cannot be avoided, refer to Starting On
a Grade With a Loaded Truck.
4. When backing up the truck, give a back-up
signal of three blasts on the horn. When starting
forward, give two blasts on the horn. These
signals must be given each time the truck is
moved forward or backward.
5. Use extreme caution when approaching a haul
road intersection. Maintain a safe distance from
oncoming vehicles.
6. Maintain a safe distance when following
another vehicle. Never follow another vehicle in
the same lane closer than 15 m (50 ft). When
driving on a downgrade, this distance should be
at least 30 m (100 ft).
7. Do not stop or park on a haul road unless it is
unavoidable. If you must stop, move the truck to
a safe place, move the directional control lever
to PARK and turn off the engine before leaving
the cab. Chock the wheels securely and notify
maintenance personnel for assistance.
8. Before driving up or down a grade, maintain a
speed that will ensure safe driving and provide
effective retarding under all conditions. Refer to
Dynamic Retarding in Section 32, Operator Cab
And Controls. Refer to the grade/speed chart in
the operator's cab to determine the maximum
safe truck speeds for descending various
grades with a loaded truck.
9. When operating the truck in darkness, or when
visibility is poor, do not move the truck unless all
headlights, clearance lights, and tail lights are
on. Do not back up the truck if the back-up horn
or lights are inoperative. Always dim the
headlights when meeting oncoming vehicles.
10. If the emergency steering light and/or low brake
pressure warning
operation, steer the truck immediately to a safe
area away from other traffic, if possible, and
stop the truck. Refer to Step 7.
11. Check the tires for proper inflation periodically
during your shift. If the truck has been run on a
"flat", or under-inflated tire, it must not be
parked in a building until the tire cools.
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