Figure 5-26.Automatic blowdown valve.
4. a water pump assembly for recirculating and
removing water from the washer, and
5. a host of controls and switches.
These components are discussed in terms of what
they do and how they do it in the following paragraphs.
TIMER ASSEMBLY.The timer assembly is
the "brain" of the automatic washer. The timers found
in automatic washers are not much different from those
found in some other major appliances, including
automatic dryers and dishwashers. The cam-operated
switch contacts are responsible for starting and
stopping most of the basic washer operations.
The basic elements of a timing switch assembly
are a split-phase motor, a set of cams, and some contact
switches. The motor, usually geared down to a speed
of about one-half revolution per hour, turns a set of
cams that open and close banks of switch contacts.
The switch contacts control the flow of line power to
the various electrical devices in the washer.
mission in an automatic washer is the most complex
piece of mechanical machinery in the appliance
industry. The transmission is wholly responsible for
converting the rotary motion of the main drive motor
into either an agitating motion or spinning action.
Although there is often a direct linkage between the
drive motor shaft and the cam assembly that produces
the agitating motion, the motor is connected to the spin
section of the transmission by means of a friction
clutch that lets the laundry tub reach its normal
spinning speed gradually without overloading the
In some current models, the transmission is shifted
from one type of action to another by means of a
solenoid-operated gearshift. The majority, however,
shift between agitate and spin according to the