57
S
ECTION
14
14
G
M
Please refer to website for latest maintenance forms.
www.northamericatraf
fi
c.com
14.1
S
Performing routine maintenance on your Portable Traf
fi
c Signal is critical to ensuring safety while in tow, as
well as the longevity of the trailer and its components. The items below are critical components that should
be inspected on a monthly basis.
Inspection of Tires:
• Tread depth should be inspected for signs of wear, refer to tire manufacturer for recommendation.
Tire Pressure:
• Use a pressure gauge to make sure your tires are in
fl
ated to
50 psi
.
Tire Condition and Age:
• Inspect the tread and sidewalls for any cuts, scrapes, punctures, bulges, bumps or cracks. Replace tire if
there is visible damage.
• The age of the tires should always be noted and considered. Tires that are six years old should be re-
placed. To determine the tire’s age, refer to the DOT stamping on the sidewall. The date code is the last
four digits at the end of the DOT stamping. The
fi
rst two numbers are the week and the last two are the
year. For example, 4617 indicates that the tire was manufactured the 46th week of 2017.
Proper Torque of Lug Nuts:
• Ensure the lug nuts are torqued on a monthly basis. Use a torque wrench. The wheel lug nuts should be
torqued to
120 ft/ lbs
.
Note: The lug nuts are torqued to spec at the factory. Check and re-torque after the
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rst 10 miles (16 km), 25
miles (40 km), and again at 50 miles (80 km) of travel. This should also be done after every wheel removal.
Continue to check the torque of the lug nuts on a monthly basis thereafter.
Check Axle Grease:
• It is important to regularly inspect the quality and quantity of grease within the axle hub cap. There is no
disassembly required. The procedure to replace axle grease is as follows:
1. Jack the trailer up to lift the wheels.
2. Remove the rubber plug from the end of the grease cap.
3. Place a standard manual grease gun on the grease
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tting.
4. While rotating the wheel, slowly pump grease into the
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tting. The old, displaced grease will
fl
ow
out of the cap around the grease gun nozzle. When clean grease is observed, remove the grease
gun. Wipe off excess grease and replace the rubber grease cap.
Check Axle Bolts for Proper Torque:
• Perform this inspection on a monthly basis - along with torquing of the tire’s lug nuts. The axle mounting
bolts should be torqued to
150 ft/ lbs.