Stihl 029, 039 - 9. MASTER CONTROL; 9.1 Switch Shaft

STIHL 029, 039 53
9. MASTER CONTROL
9.1 Switch Shaft
The main part of the Master Control
is the switch shaft with an integrally
molded multi-function operating
lever, a molded seat for the contact
spring and connector sleeve and
three levers.
The thumb-operated Master
Control lever moves the switch
shaft to select the required
function.
The following positions can be
selected with the Master Control
lever (from the top down):
- STOP (short circuit
contact closed,
ignition interrupted)
- RUN (normal operating
position)
- START (warm start -
starting throttle/
choke shutter open)
- CHOKE (cold start -
starting throttle/
choke shutter closed)
- Remove the carburetor box cover -
see 11.1.
- Set the Master Control to "CHOKE".
- Take the short circuit wire out of its
seat on the switch shaft.
- Pull the connector sleeve of the
short circuit wire out of the switch
shaft.
- Lever the switch shaft out of
its pivot mount.
- Pull the switch shaft out of
the bore.
Installation is a reversal of the
removal sequence.
Note: The contact spring must be
held up while installing the switch
shaft.
Top:
Withdrawing the switch shaft
Bottom:
Holding the contact spring up
Top:
Removing connector sleeve
1 = Seat on switch shaft
Bottom:
Detaching the switch
shaft
Positions of Master
Control lever:
1 = STOP
2 = RUN
3 = START (warm start)
4 = CHOKE (cold start)