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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
Lift unit by the frame and never the axle or suspension. Do not
go under unit unless it is properly supported by jack stands.
Unsupported units can fall causing serious injury or death.
Always wear eye protection when servicing the axle, brakes, hubs,
springs and wheels. Failure to wear eye protection may result in
serious injury.
If the equalizer or equalizer bushings must be replaced, follow the instructions above
for lifting and supporting the trailer unit and then proceed as follows:
1. With both axles blocked up, remove the spring eyebolt, keeper bolt, and
equalizer bolt from the equalizer to be repaired or replaced.
2. Press the old nylon bushing out of the equalizer.
3. Reassemble in reverse order.
SUSPENSION REPLACEMENT
1. Make sure springs are on straight. Align spring eyes to front hanger. Insert spring
eye bolts but do not torque at this point.
2. Assemble springs into equalizer.
3. After leveling equalizer to frame, torque equalizer nuts and spring eye nuts to a
minimum of 55 ft.-lb. and a maximum of 70 ft-lb.
WHEELS
WHEEL SELECTION
When specifying or replacing your trailer wheels it is important that the wheels, tires,
and axle are properly matched. The following characteristics are extremely important
and should be thoroughly checked when replacement wheels are considered:
1. Bolt Circle. Wheels have many bolt circle variations and some are so close that it
could be possible to attach an inappropriate wheel that does not match the axle
hub.
2. Capacity. Wheel load capacity should match tire and trailer max. load ratings.
3. Offset. The relationship of the center line of the tire to the hub face of the axle
should match any replacement. Failure to match offset may result in reducing
the carrying capacity of your axle.
4. Rim Contour. Replacement wheels should be direct replacements to match the
rim contour.
Use only rim contours suggested by manufacturer. Failure to use correct rim
contour may cause dramatic separation of tire and wheel and could cause serious
injury or death.
Attempting to modify or repair a wheel can cause unsafe conditions that may
result in an explosion. Air pressure on a weakened or cracked rim can cause
serious injury or death.
Electric Brake Maintenance
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