Rear Impact Guard System; Anti-Lock Brake System (Abs) - Landoll 345E Operator's Manual

Rear Impact Guard System

Vehicle standards FMVSS No. 224, Rear Impact
Protection, requires all 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,
meets the following requirements (See Figure 3-7.):
• a minimum of 4 inches vertical height
• extend laterally to within 4 inches of the sides of the
trailer
• a 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 3-7 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.

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.
DANGER
OPERATING INSTRUCTIONS

Anti-Lock Brake System (ABS)

Vehicle standards FMVSS No. 121, anti-lock brake
system requires all trailers with air brake systems to have
ABS after March 1, 1998. 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 3-7.)
• 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.
Tandem axle trailers 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.
Back up 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.
3-15