3-1
Chapter 3
Operating Instructions
General
This section supplies information for operation of the
semitrailer. It describes and locates controls and gives
general operation procedures. Read all instructions,
warnings, cautions, and danger notes before attempting
to operate the semitrailer. Operators must have proper
training before operating the semitrailer.
(See Figure 3-1
for location of semitrailer parts.)
WARNING
WARNING
Parking Brake
The parking brakes are automatically applied by spring
pressure with the air actuators of the braking system
when air pressure in the emergency line drops below 50
psi. This may be done within the truck using the trailer
parking/emergency valve or by disconnecting the
emergency gladhands.
Air Brake System
The air brake system of the semitrailer is operated from
the towing vehicle after coupling. The towing vehicle’s air
system must be coupled to the semitrailer and charged to
90 psi minimum before the brakes can adequately
function.
Anti-Lock Brake System (ABS)
The Anti-Lock Brake System of the semitrailer is constant
powered by the auxiliary (blue) circuit of the seven way
electrical connector, with backup power from the stop
lamp (red) circuit, and ground through the white wire. It is
necessary that the blue circuit is hot when the tractor key
switch is on. The blue circuit on the trailer may not be
used to power any additional auxiliary devices while the
semitrailer is moving forward. If a fault exists in the ABS,
normal braking will occur, but the wheels may lock.
Service the ABS as soon as possible.
CAUTION
CAUTION
Do not operate the semitrailer with any known
fault that might endanger the occupants, nearby
workers, other traffic, the load, or the equipment.
Do not operate the semitrailer until you have read
the operator’s manual and completely understand
the proper use and function of all controls.
Improper use can cause personal injury, damage
to your semitrailer and cargo, and cause
time-consuming breakdowns.
The auxiliary (blue) circuit is for powering the
semitrailer ABS. This circuit must be hot when
the tractor key switch is on. No other electrical
devices may be powered by this circuit while the
semitrailer is moving forward.
If a fault exists in the semitrailer ABS, normal
braking will occur, but wheels may lock. Service
the ABS as soon as possible.
Summary of Contents for 825D Series
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Page 60: ...4 20 F 691 0913 Edition MAINTENANCE AND LUBRICATION Figure 4 13 Axle and Brake Assembly...
Page 77: ...TROUBLESHOOTING GUIDE 5 9 Notes...
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