Installing And Adjusting The Guide Bar And Saw Chain - Shindaiwa 490 Manuel D'utilisation

Installing and Adjusting the Guide Bar and Saw Chain

NOTE:
For longest chain life, place new or
replacement chain loops in oil and soak
overnight before installation.
IMPORTANT!
The chain brake must be completely
disengaged before removing or
installing the clutch cover.
1. Use the socket wrench to remove
the clutch cover nut(s) in a counter-
clockwise rotation.
2. Remove the clutch cover.
3. Remove and discard the packing
spacer.
4. Place the guide bar over the guide
bar stud(s).
CAUTION!
Failure to align the guide bar and
chain tensioner pin can cause
serious damage to the clutch
cover, guide bar, tensioner pin,
and/or engine crankcase!
WARNING!
The cutters on the saw
chain are very sharp!
Always wear gloves when handling.
5. Install the chain loop over the drive
sprocket, and then align the chain
drive links within the guide bar
groove. Verify that the cutters are
properly oriented with cutter edges
facing forward on top of bar. If chain
installation is difficult or if the chain
appears too tight, refer to step 8 on
the next page.
6. Install the clutch cover over the bar
stud(s) and install the bar nut(s)
finger tight.
WARNING!
Never operate this saw
without the clutch cover
installed.
IMPORTANT!
Proper chain adjustment is essential for
maximum performance, chain life, and
operator safety. Always inspect chain
tension before operating this saw!
7. Place the saw on a flat surface and lift
the bar nose slightly.
8. To adjust chain tension:
n Turn the chain tension screw clock-
wise to tighten the chain.
n Turn the chain tension screw
counter-clockwise to loosen the chain.
n While lifting the bar nose, tighten or
loosen the adjusting screw until the
chain at mid-bar on the bottom of the
bar just contacts the guide bar rails.
9. Tighten the bar nut(s). The saw chain
tension is correct when there is not any
slack on the bottom of the guide bar
but the saw chain can move freely.
Turn Clockwise
to Tighten the
Chain (extend
the guide bar)
Re-adjusting the Saw Chain
1. To adjust chain tension in the field:
Stop the saw and allow the guide bar
and chain to cool. Loosen both bar
nuts approximately 1-turn each, and
then perform steps 7-9 above. Never
operate the saw with a loose chain!
Guide Bar
Nuts
Clutch Cover
Sprocket
Insert Chain Tensioner
Pin into the Hole
1/8" Max.
(3 - 3.5 mm)
Check the gap between chain side
plates and the bar rail
Chain
WARNING!
Adjusting
Screw Inspect chain tension often
during operation, especially
when breaking in a new chain. A
loose saw chain can jump from the
guide bar, possibly causing serious
personal injury!
Studs
Saw Chain
7