TrailMax TD-24-T(5+20), Manual

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page 46
TD-24-T (5+20)
®
Finding a system short is a matter of isolation. If the high amperage reading drops
to zero by unplugging the trailer, the short is in the trailer. If the amperage reading
remains high with all the brake magnets disconnected, the short is in the trailer wiring.
All electrical troubleshooting procedures should start at the controller. Most com-
plaints regarding brake harshness or malfunction are traceable to improperly adjusted
or non-functioning controllers. See your controller manufacturers data for proper ad-
justment and testing procedures. If the voltage and amperage is not satisfactory, pro-
ceed to the connector and then to the individual magnets to isolate the problem source.
12 volts output at the controller should equate to 10.5 volts minimum at each magnet.
Nominal system amperage at 12 volts with the magnets at normal operating tempera-
ture, i.e. not cold, system resister at zero and controller at maximum gain should be 3.0
amps for each magnet in the circuit.
Manual Brake Adjustment
Your brakes are designed with automatic adjusters. The following procedure can be
used for manual adjustment after the brakes have been serviced.
RISK OF PERSONAL INJURY!
Whenever it becomes necessary to jack the trailer it is up to you to
ensure that the trailer or axle is supported securely. Use blocks or jack
stands on solid ground, especially if you are going to be working under
the trailer.
1. Jack up the trailer wheel on the brake being adjusted. Check that the wheel and
drum rotate freely.
2. Remove the adjusting hole cover from the adjusting slot on the bottom of the
brake backing plate.
3. With a screwdriver or standard adjusting tool rotate the star wheel of the brake
adjuster assembly to expand the brake shoes. Adjust the shoes out until the pressure of
the linings against the drum makes the wheel very difficult to turn.
4. Then rotate the star wheel in the opposite direction until the wheel turns freely
with a slight lining drag. Replace the adjusting hole cover.
5. Repeat the above procedure on all brakes.
Maintenance
CAUTION
!