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MAC 6000 Hydronic Heater
Trailer Axle Manual
2106 East Indiana Ave., Bismarck, ND 58504 U.S.A. • www.macheaters.com • +1-800-272-4604
SHOES AND LININGS
Linings should be replaced if the material is worn to 1/16” or less. Shoes should also
be replaced if they become contaminated with grease or oil or have become scored,
pitted or gouged. Heat cracks are normal and rarely require attention. When replacing
shoes, both shoes on the same brake and the brakes on the same axle should all be
replaced at the same time, once again ensuring even braking capacity.
After replacing shoes and linings, your trailer brakes should be burnished-in by
applying the brakes 20-30 times with a 20 m.p.h. decrease in speed, e.g. 40 m.p.h. to
20 m.p.h. Allow ample time for brakes to cool between application. This allows the
brake shoes and magnets to begin seating to the brake drum.
AXLE AND SUSPENSION INSTALLATION
The single most important portion of axle installation is parallel alignment of the trailer
axle(s) to the tow vehicle or drive axle(s). Parallel installation allows for correct and safe
control, prolonged tread life and will all but eliminate dog-tracking. Proper alignment
is most readily achieved by measuring from the center of the trailer king pin to the
center of each end of the axles.
Lippert Components, Inc. tubular axles are made of high strength steel to prevent
metal fatigue and provide the best possible welding conditions. The round tubular
axles allow for even and uniform structure.
Always wear eye protection when servicing the axle, brakes, hubs, springs and
wheels. Failure to wear eye protection may result in serious injury.
SUSPENSION SYSTEMS
The suspension systems incorporated into Lippert Component, Inc. axles are designed
to provide the following benefits:
1. Attach the axle to the trailer.
2. Dampen the effects of road shock.
3. Provide stability to the trailer.
All Lippert suspension systems are available in single and multiple axle configurations.
For specific or custom applications, please contact Lippert Components, Inc. Axle
Division.
DOUBLEEYE LEAF SPRINGS
Double-eye leaf springs have eyes at either end of the spring assembly with nylon
bushings to assist in preventing wear. U-bolts hold the springs to the axle with a plate.
The articulation of this suspension occurs when the eyes rotate on the wear surfaces
provided in eyes of the springs and on the equalizers. This suspension is also available
in single and multiple axle configurations.
In trailers with 2 or more axles, the additional movement is maintained by an
equalizer. This feature allows for even load handling from axle to axle.
Double eye suspension systems are available on 8,000 lb. axles. Tandem and triple
axle mounting kits are available for both 33” and 35” axle spacing.
Axles and Suspension Systems
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