Dump Trailers - Owner's Manual

9. M AINTENANCE A ND S ERVICE MAC T railer uses components on their trailers such as landing gear, axle assemblies, tires and rims, hydraulic and air cylinders, which 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 T railer 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.


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.

9.1 HYDRAULIC SYSTEM Use an oil viscosity based on the expected air temperature range during the period between oil changes. Use of a good quality hydraulic oil and oil filter is critical to the performance and life of the hydraulic system.

Check the hydraulic pump, filter and cylinder manufacturer’s information for service and maintenance intervals, recommended oil viscosity and oil additives.

Do not adjust pump pressure or relief valve settings. If the hydraulic systems is not operating properly, contact a qualified hydraulics technician.


Crushing Hazard.

Adjusting pump pressure and/or relief valve settings can cause the hydraulic system to malfunction, which can result in the dump body falling.

Never adjust the pump pressure and/or relief valve settings. Contact a qualified hydraulics technician.

9.2 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.


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