Landoll 425B Series Operator'S Manual Download

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OPERATING INSTRUCTIONS

3-25

Rear Impact Guard System

Vehicle standards FMVSS No. 224, Rear Impact
Protection, requires all 425B/440/455 Series trailers
manufactured after January 26, 1998 shall be equipped
with a rear impact guard certified by the manufacturer as
meeting FMVSS No. 223, Rear Impact Guards. The
guard, or bumper,

(See Figure 3-16.)

, meets the

following requirements:

• minimum of 4 inches vertical height

• extend laterally to within 4 inches of the sides of the

trailer

• ground clearance of no more than 22 inches

• placed no more than 12 inches from the rear of the

trailer.

• capable to deflect 5 inches.

The standard also specifies minimum force and energy
absorption requirements for the guard. A DOT decal
certifies that the guard meets FMVSS No. 223 and 224
standards. The decal is placed

and must remain at all

times

on the forward facing surface of the guard, 12

inches inboard of the curb side and of the guard.

See

Figure 3-16

for location of decals.

Replace any component that does not allow the above
minimum requirements to be met. Any hardware that
holds the rear impact guard and becomes damaged or
becomes loose shall be removed and replaced. The 3/4”
grade 8 screws that hold the bumper energy pack shall
be loctited and torqued to 280 ft.-lbs.



DANGER

Anti-Lock Brake System (ABS)

Vehicle standards FMVSS No. 121, anti-lock brake
system requires all trailers manufactured after March 1,
1998 with air brake systems to have ABS. Each trailer
(including a trailer converter dolly) shall be equipped with
an anti-lock brake system that controls the wheels of at
least one axle of the trailer. Wheels on other axles of the
trailer may be indirectly controlled by the anti-lock brake
system.

NHTSA Docket 92-29; notice 11 published September
23, 1996 specifies the ABS warning light be mounted
near the rear of the left side of the trailer

(See

Figure 3-16.)

• Decal or lens marking with ABS to identify the lamp.

• The lamp must illuminate one time whenever power

is supplied to the ABS. At any time the light remains
on when power is supplied there is a malfunction to
the system.

The ABS used on the semitrailer is a commercial unit.
Single axle trailers use a two sensor, one modulator
system. Tandem and triple axle semitrailers use a four
sensor, two modulator system. Sensors are located at
each hub of the front and rear axles, and each modulator
controls one side of the trailer.

The ABS is constant powered by the auxiliary (blue)
circuit, center pin on the semitrailer seven-way electrical
connector. This circuit must be hot whenever the tractor
keyswitch is on. This circuit must also not be used to
power any additional electrical devices while the
semitrailer is moving forward. However, additional
devices such as remote controls may be powered from
the auxiliary circuit while the semitrailer is stationary.
Backup power to the ABS is supplied through the stop
lamp (red) circuit, No. 4 pin on the seven-way connector,
and ground is supplied by the white wire, No. 1 pin.



CAUTION

Malfunction in the ABS is signaled by illumination of the
ABS warning lamp located at the left rear side of the
semitrailer. The warning lamp will come on and stay on
while power is supplied to the ABS on a moving vehicle, if
there is a fault. If a fault in the ABS exists, normal braking
will still occur, but wheels may lock. The semitrailer is still
operable, but the system should be serviced as soon as
possible.

Always check the condition of the rear impact
guard system. If guard system has been
damaged, it must be replaced. Failure to maintain
guard system may result in injury or death to
others.

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.