SPECIFIC PMCS PROCEDURES (Con't)
Bolts, Nuts, and Screws . Check that they are not loose, missing, bent, or broken. You can't try them all with a tool, of
course, but look for chipped paint, bare metal, or rust around bolt heads. Tighten any that you find loose.
Welds . Look for loose or chipped paint, rust, or gaps where parts are welded together. If you find a bad weld, report it to
Electric Wires and Connectors . Look for cracked or broken insulation, bare wires, and loose or broken connectors.
Tighten loose connections and ensure that the wires are in good condition.
Hoses. Look for wear, damage, and leaks. Ensure that clamps and fittings are tight. If a leak comes from a loose fitting
or connector, tighten it. If something is broken or worn out, either correct it if authorized by the MAC (Appendix B) or
report it to direct support.
Lubrication. If instructions in the Lubrication Chart have been followed, the semitrailer is considered to be adequately
Table 4-1. Unit Preventive Maintenance Checks and Services (PMCS).
Perform Operator/Crew PMCS prior to or in conjunction with Unit PMCS if:
a. There is a delay between the daily operation and the Unit PMCS.
b. Regular operator is not assisting/participating.
Check for loose mounting and electrical connectors (1).
Check for bare wires and frayed insulation (2).
Brakes may require more frequent adjustment depending on how much use
the semitrailer receives.
Check brakeshoes (3) for wear and proper adjustment. If brakeshoe linings are worn
within 0.03 in. (0.76 mm) of rivet or screw heads, replace brakeshoes. Check minor or
Check brake components for proper operation.
4-4 Change 2