thank you for your interest in komatsu
commodity products today we'll be
discussing the controls and operation of
Komatsu's HD 465 and HD 605 - 8 truck so
with that let's get started we've been
discussing the location of the truck
controls now we will learn how they
actually function some of these controls
and operations are directly affected by
adjustments that are completed during
the commissioning process ensuring
correct adjustments and understanding
each function will provide the operator
a safe and satisfying experience let's
get started let's first start by looking
at the three foot pedals to the far
right is the standard accelerator pedal
its movement should be free of any
obstructions immediately to the left is
the right brake pedal this is the
operators normal service brake pedal
when the pedal is depressed both the
front and rear brakes are applied
proportionally based on the amount that
the pedal is depressed remember the
front brake application is dependent on
the cutoff switch position to the far
left is a red brake pedal this pedal is
called the secondary brake pedal
depressing this pedal will apply both
the front and rear brakes regardless of
where the front cutoff selection switch
is set to this brake pedal is to be used
only in the case where there is a brake
system issue or failure and the truck
cannot be stopped by the normal service
brake system we have already discussed
the four positions of the hoist EPC or
electronic proportional control lever we
will now review how each of them operate
when the dump lever is pushed all the
way down
this applies hydraulic pressure for the
bed to be powered down when the dump
lever is released it returns to the
float position with the engine running
the normal spring-loaded operatic
position is the float position when the
lever is pulled all the way up from the
float position it will
asked by the hold position and go into
the raised position the handle will stay
in the raised position by the detent at
this time the bed will be going up as
the body raises the float icon on a dash
will illuminate if the bed sensors are
set correctly at a specific angle the
handle will release and return to the
hold position you have the ability to
further extend the cylinders but you
must do so by manually lifting the lever
make sure to install the body pins now
if needed to secure the bed beside the
handle the lock knob has a pin that
keeps the lever in the holes position it
must be turned a quarter of a turn for
the pin to engage the lever this is only
for locking the handle in the hold
position when the bed is to be lowered
push the handle down to the float
position with the correct settings the
body should lower to the frame smoothly
the float light should go off and the
truck will shift correctly there are
four more controls we need to discuss to
are located on the right side of the
steering column these are the manual
retarder and arsc or automatic retarder
speed control both control handles
operate the same system in the rear axle
but do so differently using the manual
retarder control lever the operator
physically pulls the handle down when
descending a hill to slow or stop the
truck the further the handle is pulled
down the more aggressive the retarder
application is applied anytime the
retarder lever is applied the retarder
pilot light illuminates you never want
to use the manual retarder lever as a
parking brake remember to always apply
the parking brake when exiting the truck
the small lever below the manual
retarder control lever is the arsc
control arsc stands for automatic
retarder speed control this is a feature
that when enabled and set will
automatically apply the retarder to keep
the truck at or below the set speed when
the system is enabled the travel speed
indicator will show two dashes when
driving the truck at the desired
downhill speed press the end of the
lever to populate the speed indicator
the system will memorize the setting if
the set speed on the indicator needs to
be adjusted raise the handle to increase
was pushed down to decrease to cancel
the speed altogether pull the lever to
you for at least two seconds when
descending the hills there are two
parameters that must be met for the
system to work correctly the operator
must be off the throttle and the truck
speed needs to be at or below the set
for tarter speed when this happens the
arsc ready light will illuminate if the
weight of the load increases the truck
speed over the set parameters the arsc
will proportionally apply the retarder
so the truck does not exceed the set of
feet the gearshift lever allows the
operator to select any speed range for
the transmission there are seven forward
one reverse and the neutral gear
selections select the gearshift range
with the gearshift lever according to
the travel conditions the D or drive
position is used for normal travel when
d is selected the transmission will
start off in second gear unless the
operator has selected to start in first
gear by way of the monitor panel the
transmission will shift up to seventh
gear automatically based on the travel
speed the transmission will be fixed in
first gear moving forward with no
reverse if the body is raised in any
forward position is selected other than
the decision the truck will start off in
first gear and shift automatically up to
the highest speed that is selected use
these positions when traveling on soft
ground when it is difficult to travel at
high speed when starting off on a slope
with the bed loaded or when traveling
downhill the reversed position only
operates in first speed the parking
brake switch is right beside the gear
shift lever it is used to apply and
release the parking brake by pushing the
top of the switch the parking brake is
applied when the parking brake switch is
set to the park position the parking
brake pilot lamp lights up on the
monitor panel if the gearshift lever is
put in to any position other than
neutral the centralized winning lamp
will light up and the alarm buzzer will
sound intermittently when the bottom of
the switch is pushed the parking brake
is released this is the normal travel
position for safety reasons remember
that if the engine stops running while
the parking brake switch is in the
normal
Travel position the parking brake will
be applied automatically when starting
the engine again set the parking brake
switch to the park position and then set
it back to the normal travel position to
release the parking brake this concludes
the controls and operation for Komatsu's
HT for 6 5 & 6 o 5-8 truck if you have
any questions or need any additional
information please refer to the
operation and maintenance manual located
behind the seat thank you for your
interest in commodity production bolog
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