54
Revision D November 2022
Maintenance and Repair
Inspection Frequency
Inspections are recommended as needed based upon volume of traffic and impact history. Visual
Drive-By Inspections are recommended at least once a month. Walk-Up Inspections are
recommended at least once a year for QuadGuard
®
HS systems on asphalt.
Visual Drive-By Inspection
1) Check to see if there is evidence of a hit. If so, a walk-up inspection will be necessary.
2) Check to see if the Cartridges appear to be off the Support Brackets. Any damaged
Cartridges will need to be replaced.
Warning:
Refer to Cartridge placement on page 38 or 52.
3) Be sure the Nose Cover is in place.
4) Note the location and condition of the QuadGuard
®
HS system and the date of visual drive-
by inspection.
Walk-Up Inspection
1) Clear and dispose of any excessive dirt or debris around the system.
2) Be sure all bolts are tight and rust free.
3) Be sure concrete anchor bolts are securely anchored.
4) Be sure Diaphragm legs are straight.
5) Be sure all Mushroom Washer assemblies are properly aligned and positioned.
6) Fender Panels and Transition Panels should nest tightly against the system.
Warning:
Fender Panel
Maximum gap allowed:
Narrow Systems – 20 mm [3/4”]
Wide Systems – 25 mm [1”]
7) Be sure Cartridges have not been damaged and are properly positioned on their Support
Brackets. Replace crushed or sagging Cartridges. To ensure 100% of the intended speed
characteristics, partially crushed Cartridges (due to slow speed impacts) should be
replaced.
Warning:
Refer to Cartridge placement on page 37 or 51.
8) Make all necessary repairs as described above. Refer to Post-Impact Instructions on the
next page for more information.
9) Note the location and condition of the QuadGuard
®
HS system and any work done in the
Impact Attenuator Inspection Logbook under the date of this inspection. If further repair is
necessary, note repair request date in logbook. Refer to Post-Impact Instructions and
assembly section of this manual for more information.
