Operation
The wig-wag is mounted atop the washing machine's transmission, where it oscillates back and forth like a railroad signaling wig-wag (hence the name). When either solenoid is engaged, a rod catches and engages the transmission in the desired mode.
One of the wig-wag's solenoids is turned on to engage agitation during wash mode; the other solenoid is turned on to engage the spin-dry mode. The motor must be turned on before the solenoids are powered. Only one solenoid may be operated at a time. When neither solenoid is engaged, the transmission is in neutral and only the pump is operating to drain water out of the tub.
During a normal cycle, most Whirlpool-built wig-wag equipped washers will fill, start the motor, then engage the wash solenoid. Upon completion of the wash mode, the wash (agitate) solenoid will be turned off, which will allow the pump to drain the tub. After a minute or two, the timer will then engage the spin wig-wag which will cause the rotation of the tub. This is in contrast to most other top-load washing machines which start spinning and draining simultaneously. There are no pauses between cycles in these machines.
Read more about this topic: Wig Wag (washing Machines)
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