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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
SURGING BRAKES
Grease or Oil on Linings or Magnet Clean or Replace
Out of Round or Cracked Brake Drums Machine or Replace
DRAGGING BAKES
Overadjustment Readjust
Out-of-Round Brake Drums Machine or Replace
Incorrect Brake Components Replace
Loose, Bent, or Broken Brake Components Replace
Faulty Breakaway Switch Repair or Replace
Loose Wheel Bearing Adjustment Adjust
Bent Spindle Replace Axle
NOTE: If all trailer lights and brakes do not work, check your wiring plug connection
and make sure the ball is making solid contact with the coupler (that is how a trailer is
grounded). Too much grease or not using dielectric grease on the ball and coupler can
cause this to happen.
MEASURING AMPERAGE
The Braking System amperage is the amount of current flowing through the system
when all magnets have been energized. The amperage will change proportionately
with the voltage. To ensure that the battery is indicating a full charge, the towing
vehicle engine should be running with the trailer coupler connected when checking
the voltage.
If a resistor is used in the brake system, it must be set at zero or bypassed completely
to obtain the maximum amperage reading. Individual amperage draw can be
measured by inserting the ammeter in the line at the magnet you want to check.
Disconnect one of the magnet lead wire connectors and attach the ammeter between
the two wires. Consult Amperage Chart on the next page for normal amp readings.
Make sure that the wires are properly reconnected and sealed after testing is
completed.
Testing for Amperage can be done with probes (Fig. 12) or alligator clips on the leads
or an amp clamp (Fig. 13).
Troubleshooting - Amperage
Fig. 12 Fig. 13
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