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Operation - Section 3
Page 3-12
Hazard Flasher Switch (Not Shown)
Not shown in the illustration is the "HAZ-
ARD" flasher switch. It is located below the
steering wheel, approximately in the "seven
O' clock" position. Pulling the switch out
activates all turn signal lights, causing all lights to flash
simultaneously. These should be used to mark the
truck when necessary to park an inoperative truck at
the side of the road or other unusual parking place.
(5) Hoist Control Lever
The hoist control lever is a three-position hand oper-
ated switch located to the left of the operator seat.
A push button in the center of the control knob must
be depressed to unlock the lever from the neutral
position.
Pulling the lever up actuates the hoist circuit causing
body to raise. Hold lever in hoist position until load is
dumped. Releasing the lever from the hoist position will
place the body in a hold position.
To lower body, move the hoist lever to the "Down"
position and release. Releasing the lever, places the
hoist control valve in the "Float" position allowing the
body to return to the frame.
For detailed dumping instructions, refer to "Operating
Instructions", Dumping.
(6) Retarder Pedal
The Retarder Pedal is the left pedal of the three pedals
and should be used by the operator to slow the truck
during normal operation and to maintain a safe produc-
tive speed while decending grades. When the retarder
pedal is activated, only the rear oil-cooled brakes are
applied; the front brakes are not applied. The amount
of retarding is controlled by how far the operator de-
presses the pedal and with full application may be used
for non-emergency stops.
Retarder Operation
The operator should use the retarder pedal instead of
the service brake pedal for slowing the truck and for
non-emergency stops whenever speed and load con-
ditions permit. Using the retarder saves front brake
wear and provides better steering control.
When approaching a descending grade, the operator
should slow the truck and select the proper transmis-
sion gear range to maintain an engine speed of 1650 --
2350 RPM (green area on tachometer) and the brake
oil temperature below 250
operation. Refer to the Grade/Speed decal in the cab
above the windshield.
When descending a grade, the op-
erator should apply the retarder
pedal and observe both the Ta-
chometer and the Brake Oil Tem-
perature Gauge.
The engine RPM must be maintained at 1650 -- 2350
RPM (green area on tachometer) and the Brake Oil
Temperature must be maintained below 250
o
(121
C).
If the operator observes that either the maximum en-
gine speed of 2350 RPM or the Brake Oil Temperature
o
o
of 250
F (121
C) are about to be exceeded, the opera-
tor should immediately move the transmission range
selector to the next lower range and apply the service
brakes 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
required gear range to maintain engine speed at 1650
-- 2350 RPM and brake oil temperature below 250
o
(121
C). The service brakes should be used only long
enough to slow the truck to allow the transmission to
downshift. When the proper gear range is attained,
continue using the retarder to maintain a safe, produc-
tive speed.
If brake oil temperature exceeds 250
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. Continue to run engine at
high idle until Brake Oil Temperature Warning light
turns off and brake oil temperature cools to below
o
o
250
F (121
C). If temperature does not return to this
range within a few minutes, report the condition imme-
diately to maintenance personnel and wait for further
instructions before moving truck.
OM3012.2
Operator Cab and Controls
o
o
F (121
C) during retarder
o
o
o
o
F (121
C), the
F
F
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