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WSM Minor Change II Service Engineering Section
5. How the knob switch works
1) Let's suppose that the breaker has been released. To call the breaker mode again, it is neces-
sary to press the back button (breaker switch) of the knob. (This is for safety.)
2) To release the breaker, just move the knob. This is highly convenient.
3) Let's say that you have forcefully moved the lever to operate the other functions, such as boom
up or down or etc. The knob may be momentarily shaken, which may fluctuate the voltage and
unnecessarily release the breaker. To avoid this, the knob must be moved for over 0.2 second
to release the breaker operation. Just for reference, the knob does not tilt for over 0.2 second
under usual lever control conditions.
6. Breaker operation
Note: When the safety lock lever is up position, all switches of service port switch, breaker switch and
knob switch don’t function at all. This is also for safety purpose.
Therefore, once the safety lock lever is shifted up while service port operation, breaker or
thumb cylinder stops.
When to start the breaker again, first shift down the safety lock lever, press ON the service port
switch and press the breaker switch. Safety lock switch has the priority for the safety.
(1) Main key
ON
o start
(3) Meter panel controller
(8) Knob switch
(6) Breaker switch
(4) Server port switch pushed
(2) Safety lock lever
down
(7) Breaker
(5) Proportional control
ON
ON
solenoid valve
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