Move digging brake control toggle to ON
position only when carrier is stopped.
Maximum braking is applied to wheels
when toggle is moved to ON.
Moving toggle to ON while traveling would
also cause disengagement of clutch and
engagement of remote drive power take-
off.
Apply digging brake by moving control toggle to
ON position and release by moving toggle to OFF
position.
Allow sufficient time for full brake system
pressure (125 p.s.i. – 862 kPa) to be devel-
oped in upperstructure before operating
unit in remote control.
Units equipped for remote control have an
emergency brake control
located in the upper-
structure cab.
This control is to be used in case of
failure of the automatic digging brake.
If digging brake fails to apply when travel pedal is
released, move emergency brake toggle to apply
emergency brake. Notify maintenance personnel
immediately for repair of digging brakes.
Apply upperstructure emergency brake when
leaving upperstructure cab.
See pages 29 and 30 for detailed instructions on
remote control operation.
Air Drier
An air drier is furnished to remove moisture and
contaminants from air as it is delivered from com-
pressor to first air reservoir. The drier includes a
heating element to prevent freezing.
During compressor unloading, moisture and contam-
inants are purged from drier to atmosphere.
Under certain temperature conditions, condensation
may cause a small amount of water to accumulate in
system. Check air reservoirs weekly for moisture
accumulation.
The air drier desiccant cartridge should be serviced
or replaced annually unless experience indicates a
shorter or longer interval. Refer to brake section of
service manual for air drier maintenance instructions.
W A R N I N G
The DIGGING BRAKE indicator light will flash on
and off when digging brake is applied and ignition
switch is turned on.
Remote control braking
The digging brake is applied by the control toggle in
the carrier cab. After moving digging brake control
toggle to ON, the digging brake will be released and
reapplied automatically as travel pedal in upper-
structure is actuated and released.
2 0
DIGGING BRAKE APPLICATION
