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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
Torsion Axle Torque Specifications
Axle Size Bolt Size Torque Range
#8 - #9 1/2" 70-90 ft-lb.
#10 - #13 5/8" 120-155 ft-lb.
Washer(s) must be placed against the
slotted hole in the axle bracket
NOTE: Low profile brackets have plain
round holes
Fig. 8
Outside Frame
Outside bracket
dimension
NOTE: For Torsion installation, mount
axle bracket to frame bracket (Fig. 8)
and torque fasteners as specified in the
chart below.
INSPECTION
All the components of your suspension system should be visually inspected for signs
of wear, damage or loose fasteners at least every 6,000 miles. When replacing or
tightening loose fasteners, consult the torque specs on page 16 for correct torque
values.
Worn spring eye bushings or sagging or broken springs should be replaced using the
following method:
1. Support the trailer with the wheels just off the ground. Follow the trailer
manufacturer’s recommendations for lifting and supporting the unit.
2. After the unit is properly supported place a suitable block under the axle tube
near the end to be repaired. This block is to support the weight of the axle only
so that suspension components can be serviced or replaced.
3. Disassemble the U-bolts, nuts, and tie plates.
4. Remove the spring eye bolts and the spring.
5. If the spring eye bushings are to be replaced, press out the old bushing by hand
or tapping out with a punch.
6. Free-floating nylon bushing needs no lubrication. Press the new bushing into
the spring eye by hand or gently tapping it in with a bounceless rubber or plastic
mallet.
7. Reinstall repaired or replaced components in reverse order.
NOTE: For multiple axle units, the weight of each axle must be supported as outlined
in Step 2 before disassembly of any component of the suspension system.
Axles and Suspension Systems
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