Dolmar PS-420 User Manual
Page 36
6
8
12
1 1
9
Check the sprocket before mounting a new chain.
Worn out sprockets (8) may damage the new chain and must
therefore be replaced.
Remove the sprocket guard (See „PUTTING INTO OPERA-
TION“).
Remove the chain and guide bar.
Remove circlip (9).
CAUTION: The circlip will pop out of the groove. When removing
it, hold your thumb against it to prevent it from popping off.
Remove thrust washer (11).
If the sprocket (8) is worn out, the complete clutch drum (12)
will need to be replaced (for the part number, see “Extract from
the spare parts list”).
Install a complete new clutch drum (12), cup washer (11) and
new circlip (9) (for the part numbers, see “Extract from the
spare parts list”).
For replacing the guide bar, chain, and sprocket see „PUTTING
INTO OPERATION“.
NOTE:
Don’t use a new chain on a worn chain sprocket. By the time
2 chains have worn, the sprocket has become worn out, so
it should be replaced at least at every second chain replace-
ment. To distribute the chain oil evenly, run a new chain at
half-throttle for a few minutes before use.
New chains stretch, so check the chain tension frequently (see
“Checking the chain tension”).
Replacing the saw chain
CAUTION: Use only chains and guide bars designed for this saw (see the Extract from the spare-parts list)!
When changing the type of chain, the complete clutch drum (12) must be changed to fit the different chain. If neces-
sary, replace it.