3-173-17
RetarderRetarder
This control lever (1) is used to apply retardation to the truck. Retardation is theThis control lever (1) is used to apply retardation to the truck. Retardation is the
term used for applying a continuous braking force term used for applying a continuous braking force to hold the truck to a safe steadyto hold the truck to a safe steady
speed when descending grades.speed when descending grades.
The retarder is OFF when the lever is fully forward and is APPLIED as the lever The retarder is OFF when the lever is fully forward and is APPLIED as the lever isis
pulled back. Maximum retardation is obtained when the lever is in pulled back. Maximum retardation is obtained when the lever is in the fully backthe fully back
position. The retarder may be used anytime to slow down. If additional braking isposition. The retarder may be used anytime to slow down. If additional braking is
required apply the service brakes. The retarder is not meant for bringing therequired apply the service brakes. The retarder is not meant for bringing the
machine to a halt, or for sudden deceleration - the service brakes should bemachine to a halt, or for sudden deceleration - the service brakes should be
employed for this purpose.employed for this purpose.
When the retarder is applied, the 'Retarder Indicator Light' When the retarder is applied, the 'Retarder Indicator Light' on the instrument panelon the instrument panel
will illuminate and an orange coloured warning light will illuminate and an orange coloured warning light at the rear of the truck willat the rear of the truck will
illuminate to warn following vehicles.illuminate to warn following vehicles.
Retardation of this truck may be achieved Retardation of this truck may be achieved by using the DISC BRAKE RETARDERby using the DISC BRAKE RETARDER
or the or the TRANSMISSIOTRANSMISSION RETARDER.N RETARDER.
Machines fitted with Disc Brake and Transmission Retarders have a 'RetarderMachines fitted with Disc Brake and Transmission Retarders have a 'Retarder
Selection Switch' (2). This selects which Selection Switch' (2). This selects which retarder will be employed when using theretarder will be employed when using the
retarder control. Pressed at top = Disc Brake, Pressed at bottom = Transmission.retarder control. Pressed at top = Disc Brake, Pressed at bottom = Transmission.
Machines which do not have a transmission retarder fitted Machines which do not have a transmission retarder fitted do not have the selectiondo not have the selection
switch fitted.switch fitted.
The operator should select the correct gear range to match The operator should select the correct gear range to match the site conditions.the site conditions.
Application of the retarder gives the transmission enhanced retardation through 6thApplication of the retarder gives the transmission enhanced retardation through 6th
and 5th gears until 4th gear is and 5th gears until 4th gear is attained.attained.
Note:Note:In order to obtain the maximum In order to obtain the maximum retardation and cooling effect duringretardation and cooling effect during
retardation, the engine speed should be maintained as high retardation, the engine speed should be maintained as high as possible withoutas possible without
exceeding the maximum exceeding the maximum recommendationrecommendation..
14801480
WARNINGWARNING
Do not use the retarder forDo not use the retarder for
parking the vehicle. Only use theparking the vehicle. Only use the
parking-emergency brakeparking-emergency brake
control for this purpose.control for this purpose.
1
1
22
33
44
55
DD
NN
RR
11
RR
22
11
22
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