Husqvarna ST723 Manuel de référence
Product Service Bulletin
012799-1
1999-01
Engineering Services
Models Affected:
Serial Numbers: Some 1997 & 1998 production units.
Issue Reported: Field reports have indicated that these units may throw the
transmission drive belt off from the engine or transmission pulley. This can
occur when the transmission engagement lever is disengaged.
Action Required: 1. Adjustment of the transmission belt guides at the engine
transmission pulley.
2. Removal of the orange and grey frame mounted belt
guides.
3. Reposition and install grey belt guide in inverted
position, aligning with transmission drive belt.
4. Adjust grey belt guide after tightening to a clearance of
3/16 inch from surface of belt, when belt is in the
engaged position.
ST723, ST926, ST1030
1. Adjust belt guides at the engine transmission pulley.
Facing the engine pulley, locate the left hand guide in a down posi-
tion and the right hand guide in an up position. With the engine
off, clamp the transmission engagement lever down on the handle.
Position the guides in the position described above. Adjust the
guides so that they are no more than 1/4 inch away from the belt
surface when the belt is engaged. Take care that the guide is not
touching the belt.
Rotate left hand guide down. Rotate right hand guide up.
Move guide so that it is just off surface of belt
when engaged, no more than 1/4 inch.
2. Remove belt guides mounted to left hand side of frame
under belt cover.
Remove belt cover and locate two belt guides bolted to left side of
frame near front motor mount. One guide is orange and the other
is gray. Remove the bolts securing the guides and remove the two
guides. Discard the ORANGE guide and remove and discard the
two speed nuts used to retain the bolts. The grey guide will be
used in the next step.
Two belt guides located at left side of frame
under belt cover.
3. Reposition the grey belt guide.
Take the grey belt guide removed in step two and install it in an
inverted ( upside down )position in the hole located closest to the
engine. This is one of the two holes used to hold the guides in
place when removed in step two. This will be positioned in line
with the transmission drive belt. Position the guide as shown in
the picture. Use a 1/4 inch bolt approximately 1/2 inch in length
and install it from the bottom side of the bracket when in position.
Install a 1/4 inch nut and finger tighten. Facing the front of the
unit, slide the belt guide over to the far right position as far as it
will go and tighten the nut and bolt securely. Take care when
tightening so that the guide remains square to the frame, ie. run-
ning parallel to the belt.
Position the grey belt guide
in an inverted position in the
hole closest to the engine.
Push the guide over to the
right as far as it will go and
tighten. Be sure the guide
stays square to the frame.
Belt guide inverted.
Transmission
belt.
With the transmission lever depressed
( belt engaged ), lightly push the guide
away from the transmission belt until it
has a clearance from the belt of
approximately 3/16 inch.
Push guide to
adjust
Approximately
3/16 inch
4. Adjust grey belt guide.
With the transmission belt in the engaged position, lightly bend the guide away from
the belt so that the bottom of the guide will be approximately 3/16 inch from the sur-
face of the belt.
Ce manuel convient aux modèles suivants
2
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