9. Maintenance
OILING PORT
18
TRANSMISSION
• The reduction gears are lubricated by multipurpose,
lithium-based grease in the angle transmission. Sup-
ply new grease every 25 hours of use or more often
depending on the job condition.
•
BLADES
• When refilling the tank or resting, it is often a good
idea to use the time to oil the cutting blades.
• If a gap exists between the upper and lower blades,
follow the procedure below to adjust them so that they
fit more closely together.
Upper blade
Lower blade
1. Loosen lock nut (A) as shown in the diagram.
2. Tighten screw (B) fully, and then turn one-third to one-
half of a rotation backward.
3. While holding onto the screw to keep it in position,
tighten the lock nut.
4. Check to make sure that the flat washer (C) is loose
enough so that it may be turned by pressing on it with
a finger.
NOTE
(1) Grease fitting
Screwing in the screw too tightly may make it impossi-
ble for the blades to move while not screwing in the
screw tightly enough may make the blades of the
trimmer feel dull and cause leaves and branches to
become caught in the blades of the trimmer.
When adding lubricant, use a grease gun to insert
lubricant into the three grease nipples located on the
transmission.
Dismount the guide bar and check the oiling port for
blockages.
(1) Oiling port
GUIDE BAR
Remove sawdust in the bar groove and the oiling port.
Groove
Oiling port
Grease the nose sprocket from the feeding port on the
tip of the bar.
Grease port
Sprocket
The bar rail should always be a square. Check for wear
of the bar rail. Apply a ruler to the bar and the outside of
a cutter. If a gap is observed between them, the rail is
normal. Otherwise, the bar rail is worn. Such a bar needs
to be corrected or replaced.
Ruler
Gap
No gap
Chain tilts
SPROCKET
Check for extensive wear, and replace it when the teeth
are worn over 0.3 mm.
Sprocket
0.3 mm
