Starting On A Grade With Aloaded Truck; Passing; Loading; Overload Speed Limit Function - Komatsu 930E-4SE Operation & Maintenance Manual

OM3062 8/11
STARTING ON A GRADE WITH A
LOADED TRUCK
Initial propulsion with a loaded truck should begin
from a level surface whenever possible. If the truck
must be started on a hill or grade, use the following
procedure:
1. Fully depress the service brake pedal. Do not
use the retarder lever to hold the truck on the
grade. With the service brakes fully applied,
move the directional control lever to a drive
position (FORWARD
increase the engine rpm with the throttle pedal.
2. As the engine rpm approaches the maximum,
and the operator senses the propulsion effort
working against the brakes, release the brakes
and let truck movement start. Completely
release the service brake pedal. As the truck
speed increases above 5-8 kph (3-5 mph), the
propulsion system controller (PSC) will drop the
propulsion if the retarder is still applied.
NOTE: Releasing and re-applying dynamic retarding
during a hill start operation will result in loss of
propulsion.

PASSING

1. Do not pass another truck on a hill or blind
curve. Only use areas designated for passing.
2. Before passing, make sure that the road ahead
is clear. If a disabled truck is blocking your lane,
slow down and pass with extreme caution.

LOADING

1. Pull into the loading area with caution. Remain
at a safe distance while the truck ahead is being
loaded.
2. When approaching or leaving a loading area,
watch out for other vehicles and personnel
working in the area.
3. When pulling in under a loader or shovel, follow
the spotter or shovel operator's signals. The
truck operator may speed up loading operations
by observing the location and loading cycle of
the truck being loaded ahead, then follow a
similar pattern.
4. During loading, the operator must stay in the
cab with the engine running. Place the
directional control lever in NEUTRAL and apply
the brake lock.
5. When loaded, pull away from shovel as quickly
as possible but with extreme caution.
or REVERSE) and
Operating Instructions - Section 30

Overload Speed Limit Function

NOTE: This feature can be enabled or disabled at
the discretion of site management. The setting for
payload trigger and speed limits are also adjustable
by local site preference.
The overload speed limit function limits the speed of
the truck if a payload limit setting has been exceeded.
The overload signal becomes true (24 volts) when the
PLMIII early estimate of payload exceeds the preset
payload ton threshold.
The PLMIII early estimate of payload calculation
occurs after 12 seconds of travel above 5 kph (3
mph) after being loaded. Once the overload signal
becomes true, it stays true until the payload is
dumped.
By default, the overload speed limit is disabled
(option 0 in the configuration file). The configuration
file can be set to:
Option 1 - Overload speed limit is imposed.
or
Option 2 - No propel restriction is imposed and
logged. The truck cannot move under its own power
when the overload signal becomes true.
The overload speed limit can be adjusted by
modifying the configuration file. Use the Payload
Service Software Lite Version (available for download
at www.KomatsuAmerica.net) to set the overload
threshold.
When option 1 is selected, and the overload signal is
true, tractive effort is reduced to attempt to respect
the speed limit setting. The retard effort will not be
engaged to lower the speed of the truck. Once the
truck speed matches that of the overload speed limit
setting, limited propel efforts and retarding efforts will
be used as necessary. This feature maintains the
truck speed at the maximum of the overload speed
limit setting.
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