Makita LXT DUC204Z [17/108] Cleaning the guide bar
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Makita LXT DUC204Z [17/108] Cleaning the guide bar

Makita LXT DUC204Z [17/108] Cleaning the guide bar
17 ENGLISH
Sharpening the saw chain
Sharpen the saw chain when:
• Mealy sawdust is produced when damp wood is
cut;
• Thechainpenetratesthewoodwithdifculty,even
when heavy pressure is applied;
• The cutting edge is obviously damaged;
• The saw pulls to the left or right in the wood.
(caused by uneven sharpening of the saw chain or
damage to one side only)
Sharpen the saw chain frequently but a little each time.
Twoorthreestrokeswithaleareusuallysufcientfor
routine resharpening. When the saw chain has been
resharpened several times, have it sharpened in our
authorized service center.
Sharpening criteria:
WARNING: An excessive distance between
the cutting edge and depth gauge increases the
risk of kickback.
►Fig.27: 1. Cutter length 2. Distance between cutting
edge and depth gauge 3. Minimum cutter
length (3 mm)
— All cutter length must be equal. Different cutter
lengths prevent the saw chain from running
smoothly and may cause the saw chain to break.
— Do not sharpen the chain when the cutter length
has reached 3 mm or shorter. The chain must be
replaced with new one.
— The chip thickness is determined by the distance
between the depth gauge (round nose) and the
cutting edge.
— The best cutting results are obtained with following
distance between cutting edge and depth gauge.
• Chain blade 90PX : 0.65 mm
• Chain blade 91PX : 0.65 mm
• Chain blade 25AP : 0.65 mm
►Fig.28
— The sharpening angle of 30° must be the same on
all cutters. Different cutter angles cause the chain
to run roughly and unevenly, accelerate wear, and
lead to chain breaks.
— Useasuitableroundlesothatthepropersharp-
ening angle is kept against the teeth.
• Chain blade 90PX : 55°
• Chain blade 91PX : 55°
• Chain blade 25AP : 55°
File and le guiding
— Useaspecialroundle(optionalaccessory)for
saw chains to sharpen the chain. Normal round
lesarenotsuitable.
— Diameteroftheroundleforeachsawchainisas
follows:
• Chain blade 90PX : 4.5 mm
• Chain blade 91PX : 4.0 mm
• Chain blade 25AP : 4.0 mm
— Theleshouldonlyengagethecutteronthefor-
wardstroke.Lifttheleoffthecutteronthereturn
stroke.
— Sharpentheshortestcutterrst.Thenthelength
of this shortest cutter becomes the standard for all
other cutters on the saw chain.
— Guidetheleasshowninthegure.
►Fig.29: 1. File 2. Saw chain
— Thelecanbeguidedmoreeasilyifaleholder
(optionalaccessory)isemployed.Theleholder
has markings for the correct sharpening angle of
30° (align the markings parallel to the saw chain)
and limits the depth of penetration (to 4/5 of the
lediameter).
►Fig.30: 1. File holder
— After sharpening the chain, check the height of the
depth gauge using the chain gauge tool (optional
accessory).
►Fig.31
— Removeanyprojectingmaterial,howeversmall,
withaspecialatle(optionalaccessory).
— Round off the front of the depth gauge again.
Cleaning the guide bar
Chips and sawdust will build up in the guide bar groove.
Theymayclogthebargrooveandimpairtheoilow.
Clean out the chips and sawdust every time when you
sharpen or replace the saw chain.
►Fig.32
Cleaning the sprocket cover
Chips and saw dust will accumulate inside of the
sprocket cover. Remove the sprocket cover and saw
chain from the tool then clean the chips and saw dust.
►Fig.33
Cleaning the oil discharge hole
Small dust or particles may be built up in the oil dis-
charge hole during operation. These dust or particles
mayimpairtheoiltoowandcauseaninsufcient
lubrication on the whole saw chain. When a poor chain
oil delivery occurs at the top of guide bar, clean the oil
discharge hole as follows.
1. Remove the sprocket cover and saw chain from
the tool.
2. Remove the small dust or particles using a slotted
screwdriver with a slender shaft or the like.
►Fig.34: 1. Slotted screwdriver 2. Oil discharge hole
3. Insert the battery cartridge into the tool. Pull the
switchtriggertoowbuilt-updustorparticlesofftheoil
discharge hole by discharging chain oil.
4. Remove the battery cartridge from the tool.
Reinstall the sprocket cover and saw chain on the tool.
Replacing the sprocket
CAUTION: A worn sprocket will damage a
new saw chain. Have the sprocket replaced in this
case.

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