Dolmar MS-252 - Page 16

NYLON CUTTING HEAD
The nylon cutting head is a dual string trimmer head capable of both automatic and
bump & feed mechanisms.
The nylon cutting head will automatically feed out the proper length of nylon cord by
thechangesincentrifugalforcecausedbyincreasingordecreasingrpms.However,
tocutsoftgrassmoreefficiently,bumpthenyloncuttingheadagainstthegroundto
feed out extra cord as indicated under operation section.
Operation
Increasethenyloncuttingheadspeedtoapprox.6,000min –
-1
.
Lowspeed(under4,800min
-1
)isnotsuitable,thenyloncordwillnotfeedout
properly at low speed.
The most effective cutting area is shown by the shaded area. –
If the nylon cord does not feed out automatically proceed as follows:
1. Releasethethrottlelevertoruntheengineidleandthensqueezethethrottle
lever fully. Repeat this procedure until the nylon cord feeds out to the proper
length.
2. Ifthenyloncordistooshorttofeedoutautomaticallywiththeaboveprocedure,
bump the knob of the nylon cutting head against the ground to feed out the
nylon cord.
3. Ifthenyloncorddoesnotfeedoutwithprocedure2,rewind/replacethenylon
cordbyfollowingtheproceduresdescribedunder“Replacingthenyloncord”.
Replacing the nylon cord
First,stoptheengine. –
Pressonthehousinglatchesinwardtoliftoffthecover,thenremovethespool. –
Most effective cutting area
Idle speed Full speed
Knob
Cover
Latches
Press
Press
Spool
80mm(31/8”)
For left hand rotation
Spool
100mm(315/16”)
Notches
Eyelets
Hookthecenterofnewnyloncordintothenotchinthecenterofthespool,with –
oneendofthecordextendingabout80mm(31/8”)morethantheother.
Then wind both ends firmly around the spool in the direction of the head rotation
(left-hand direction indicated by LH and right-hand direction by RH on the side of
the spool).
Windallbutabout100mm(315/16”)ofthecords,leavingtheendstemporarily –
hooked through a notch on the side of the spool.
Mount the spool in the housing so that the grooves and protrusions on the spool –
match up with those in the housing. Keep the side with letters on the spool visible
onthetop.Now,unhooktheendsofthecordfromtheirtemporarypositionand
feed the cords through the eyelets to come out of the housing.
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