ELECTRICAL SYSTEM
9
Circuit breakers
Circuit breakers are safety devices that open a circuit
when the current flow reaches a certain level. This
helps to prevent components from being damaged by
the high current flow.
A circuit breaker is basically a switch. When current
flows through a circuit, it creates heat. The higher the
current flow, the more heat that is created. As current
flows through a circuit breaker the contacts heat up. If
the current heats the contacts enough, they will release
the piece used to jump across the contacts. That will
open the circuit and prevent current flow.
Some circuit breakers are self resetting, meaning that
as they cool down, the circuit is closed. The circuit
breaker on this mower has a manual reset function.
That means that a button has to be pushed in to
restore the connection between the contacts. The cir
-
cuit breaker may have to cool down for a few minutes
before the breaker can be reset.
See Figure 2.11.
Figure 2.11
Reset button
To test a circuit breaker
1. Let the circuit breaker cool down for at least five
minutes and reset the breaker.
NOTE: If the circuit breaker will not reset, unplug
the wires from the breaker and let it cool down
for five minutes. If it still will not reset, the
breaker is bad and must be replaced.
2. If not already done, remove the circuit breaker
from the circuit by unplugging the two wires.
NOTE: See chapter 3 Repair Procedures for the
steps to open the switch box assembly.
3. Check for continuity between the two tangs. See
Figure 2.12.
NOTE: If there is no continuity between the two
tangs, the breaker is bad and must be replaced.
NOTE: The part number for just the circuit
breaker is 925-1712.
Figure 2.12
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