8. M AINTENANCE A ND S ERVICE MAC Trailer uses components on their trailers such as landing gear, axle assemblies, tires and rims, hydraulic and air cylinders, which are produced by other manufacturers. Refer to the OEM manufacturer’s information for specific maintenance instructions. If you do not have the manufacturers’ information, contact your dealer or MAC Trailer for assistance. Routine inspections, maintenance and service must be performed on your trailer on a regular basis to insure safe and reliable operation. Inspections can be performed by a person trained in spotting potential problems. Service and repairs must be performed by a trained, qualified technician. Note: In addition to this manual, also check the relevant component manufacturer's manual.
^ WARNING
Crushing hazard. Before performing trailer Inspections, service or maintenance: • Park trailer on firm, level surface. • Set parking brakes, turn truck engine off and remove ignition key. • Chock tires if brakes are to be released. • Support trailer with properly rated and placed stands.
8.1 TIRES Before each tow, be sure the tire pressure is at the value indicated on the Certification / VIN label. Tire pressure must be checked while the tire is cold. Do not check the tire pressure immediately after towing the trailer. Allow at least three hours for a tire to cool, if the trailer has been towed for as much as one mile. Replace tires that have the wear bands showing before towing trailer. A bubble, cut or bulge in a side wall can result in a tire blowout. Inspect both side walls of each tire for any bubble, cut or bulge, and replace a damaged tire before towing the trailer.
^ WARNING
Collision hazard. Worn, damaged or under-inflated tires can cause loss of control, injury and damage. Check tires before towing trailer.
8.2 WHEELS Whenever tires/wheels are removed, check the condition of the wheel, wheel lugs, hubs and studs. Replace any damaged, corroded or worn parts. Use the correct wheel lugs and wedges (if equipped) for your trailer.
^ WARNING
Wheel failure hazard. • Never weld on wheel or hub for any reason • Never install aluminum wheels on an axle designed for steel wheels. The stud length is greater for aluminum wheels than steel wheels. • Always use the correct lugs and wedges (if equipped).
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