Makita DCS3500 Operating instructions

___
Reparaturanleitung PS-4600 / PS-5000 1
Repair manual DCS3500 / DCS3501 / DCS4300 / DCS4301 / EA3500F / EA3501F / EA4300F / EA4301F / MEA3500L / MEA3500M / MEA4300G / MEA4300L
www.dolmar.de
Repair Manual
Caution:
Before doing any maintenance or service work, the combination switch must be engaged in the service position, in
order to prevent unintended starting by the easy start system!
DCS3500
DCS3501
DCS4300
DCS4301
EA3500F
EA3501F
EA4300F
EA4301F
MEA3500L
MEA3500M
MEA4300G
MEA4300L

___
Reparaturanleitung PS-4600 / PS-5000 2
Repair manual DCS3500 / DCS3501 / DCS4300 / DCS4301 / EA3500F / EA3501F / EA4300F / EA4301F / MEA3500L / MEA3500M / MEA4300G / MEA4300L
Page
Technical data ........................................................................................................................................................................... 3
Troubleshooting ........................................................................................................................................................................ 4
00 Special tools..........................................................................................................................................................................5 - 7
01 Sprocket guard / Chain tensioning system ................................................................................................................................ 8
02 Clutch drum with chain sprocket ............................................................................................................................................... 9
03 Chain brake / Guide bar bolt ............................................................................................................................................10 - 11
04 Clutch................................................................................................................................................................................12 - 13
05 Oil pump................................................................................................................................................................................... 14
06 Starter ...................................................................................................................................................................................... 15
07 Ignition system (trouble-shooting)............................................................................................................................................ 16
07 Ignition system ................................................................................................................................................................. 17 – 18
08 Carburetor........................................................................................................................................................................ 19 – 20
09 Vibration damper...................................................................................................................................................................... 21
10 Tank................................................................................................................................................................................. 22 – 23
11 Cylinder / Piston .............................................................................................................................................................. 24 – 26
12 Crankcase / Crankshaft ........................................................................................................................................................... 27
13 Torques ................................................................................................................................................................................... 28
CONTENTS

___
Reparaturanleitung PS-4600 / PS-5000 3
Repair manual DCS3500 / DCS3501 / DCS4300 / DCS4301 / EA3500F / EA3501F / EA4300F / EA4301F / MEA3500L / MEA3500M / MEA4300G / MEA4300L
DCS3500 / DCS3501 EA3500F / EA3501F
MEA3500M / MEA 3500L DCS4300 / DCS4301 EA4300F / EA4301F MEA4300G / MEA4300L
Stroke volume cm
3
34.7 42.4
Bore mm 38 42
Stroke mm 30.6 30.6
Max. power at speed kW / 1/min 1.5 / 9,500 1.7 / 9,500 2.0 / 9,500 2.2 / 9,500
Max. torque at speed Nm / 1/min 1.9 / 6,500 2.1 / 6,500 2.4 / 6,500 2.6 / 6,500
Idling speed / max. engine speed with bar and chain 1/min 2,800 / 13,500 2,800 / 13,500
Clutch engagement speed 1/min 5,100 5,100
Sound pressure level at the workplace L
pA av
per ISO/CD 22868
1)
dB (A) 100.8 100.8
Sound power level L
WA av
per ISO/CD 22868
1)
dB (A) 110 110
Vibration acceleration a
h,w eq
per ISO 22867
1)
- Tubular handle m/s
2
4.3 3.6
- Rear handle m/s
2
3.6 3.2
Carburetor (diaphragm, choke flap carburetor) Typ membrane carburetor membrane carburetor
Ignition system Typ electronic electronic
Spark plug Typ NGK BPMR 7A NGK CMR7A-5 NGK BPMR 7A NGK CMR7A-5
Electrode gap mm 0.5 0.5
or spark plug Typ BOSCH WSR 6F,
CHAMPION RCJ 6Y - - BOSCH WSR 6F, CHAMPION RCJ 6Y - -
Fuel consumption at max. load per ISO 7293 kg/h 0.79 0.96
Specific consumption at max. load per ISO 7293 g/kWh 526 480
Fuel tank capacity l 0.48 0.48
Chain oil tank capacity l 0.28 0.28
Mixture ratio (fuel/two-stroke oil)
- when using DOLMAR oil
50 : 1 / 100: 1 (HP-100) 50 : 1 / 100: 1 (HP-100)
- when using Aspen Alkalyt (two-stroke fuel) 50 : 1 (2%) 50 : 1 (2%)
- when using other oils 50 : 1 (quality grade JASO FC or ISO EGD) 50 : 1 (Qualitätsstufe JASO FC oder ISO EGD)
Chain brake engages manually or in case of kickback engages manually or in case of kickback
Chain speed at max. power m/s 18.1 18.3
Sprocket pitch inch 3/8 .325
Number of teeth Z 6 7
Chain type see the spare-parts list see the spare-parts list
Pitch / gauge inch 3/8 / 0.050 (1.3) .325 / 0.050 (1.3)
Guide bar, length of a cut cm 30, 35, 40 33, 38, 45
Guide-bar type see the spare-parts list see the spare-parts list
Weight (fueltankempty,withoutchain,guidebarandaccessories) kg 4.7 / 4.8
2)
4.8 / 4.9
2)
4.7 / 4.8
2)
4.8 / 4.9
2)
1) Figures derived in equal part from idling, full-load and racing speed.
2) On models with catalytic converter.
TECHNICAL DATA

___
Reparaturanleitung PS-4600 / PS-5000 4
Repair manual DCS3500 / DCS3501 / DCS4300 / DCS4301 / EA3500F / EA3501F / EA4300F / EA4301F / MEA3500L / MEA3500M / MEA4300G / MEA4300L
Malfunction System Observation Cause
Chain does not run Chain brake Engine runs Chain brake actuated, Chain too tight
Engine does not start
or
only with difficulty
Ignition system
Ignition spark
No ignition spark
Malfunction in fuel supply system, pressure system,
mechanical malfunction.
STOP switch stuck in service position, fault or short-
circuit in the wiring,
plug cap or spark plug defective,
gap between ignition module and flywheel uneven or too
wide
Fuel supply
Compression
Mechanical malfunction
Fuel tank is filled
Inside system
Outside
Starter does not engage
Combination switch in Choke position,
carburetor defective, suction head dirty,
fuel line bent, leaky or interrupted.
Cylinder base packing ring defective, radial shaft
packings defective,
cylinder or piston rings defective
Spark plug does not seal.
Spring in starter broken, broken parts inside the engine.
Engine speed gets
“stuck” Multiple systems Engine speed about
4,500 - 6,000 rpm
Carburetor too lean
Bleed air at cylinder and/or rubber induction piece
Fuel line bent, throttle link stuck
Warm engine won’t
start Carburetor Fuel tank is filled
Ignition spark Wrong carburetor adjustment
Flooded from choke use
Piston ring worn (max. thrust play 0.5 mm)
Engine starts, but
dies immediately Fuel supply Fuel tank is filled Wrong idling adjustment, suction head or carburetor dirty,
tank venting defective, fuel line interrupted, cable
defective, Choke flap closed, decompression valve dirty
Insufficient power
Several systems
may be involved
simultaneously
Engine is idling Air filter dirty, incorrect carburetor setting, muffler
clogged, exhaust channel in cylinder clogged, spark
arrester screen clogged.
No chain lubrication Oil tank/pump
No oil on the chain Oil tank empty Oil guide groove dirty, Oil suction head dirty
Oil pump adjusting screw incorrectly adjusted
Oil pump worm drive gear defective
TROUBLESHOOTING

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Reparaturanleitung PS-4600 / PS-5000 5
Repair manual DCS3500 / DCS3501 / DCS4300 / DCS4301 / EA3500F / EA3501F / EA4300F / EA4301F / MEA3500L / MEA3500M / MEA4300G / MEA4300L
123
4
5
00
SP
ECIAL TOOLS
1 Torx screwdriver
Grip (944.500.860)
T-grip 200 mm (944.500.862)
T-grip 100 mm (944.500.861)
2 Mandrel
Disassembly mandrel for
tapping out the flywheel
without damage to
the crankshaft thread (944.500.880)
3 Setting gauge
Gauge for measuring the gap
between flywheel and
armature (944.500.891)
4 Torque wrench
3/8” Drive socket (944.500.864)
Bit 152 mm (944.500.865)
Bit 49 mm (944.500.866)
Torque wrench
3/8” Drive (950.230.000)
5 Piston stop wedge
Wedge for blocking
the engine through the
exhaust port (944.602.001)

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Reparaturanleitung PS-4600 / PS-5000 6
Repair manual DCS3500 / DCS3501 / DCS4300 / DCS4301 / EA3500F / EA3501F / EA4300F / EA4301F / MEA3500L / MEA3500M / MEA4300G / MEA4300L
6 7
9
8
10
11 12 13
00
SPECIAL TOOLS
6 Piston ring tensioner
Piston ring band and
assembly tool for cylinders (944.600.001)
7 Assembly and disassembly wrench
Wrench for disassembling and
assembling the centrifugal
clutch (944.500.590)
8 Pressure gauge
Pressure guage for checking
the carburetor fuel valve (956.004.000)
9 Tachometer
Electronic tachometer for measuring
the engine speed of
2- and 4-stroke engines (950.233.220)
10 3/8” socket
Installation/removal of
Spark plug, clutch (944.500.864)
11 Needle-nose pliers
Various assembly/
Disassembly tasks (944.603.400)
12 Disassembly hook
Removal/installation
Brake band spring (950.237.000)
13 Over/underpressure pump
For checking sealing of
radial rings and gaskets (957.004.001)

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Reparaturanleitung PS-4600 / PS-5000 7
Repair manual DCS3500 / DCS3501 / DCS4300 / DCS4301 / EA3500F / EA3501F / EA4300F / EA4301F / MEA3500L / MEA3500M / MEA4300G / MEA4300L
14 15
00
SPECIAL TOOLS
14 Sealing plate
For sealing intake side (944.603.020)
15 Sealing plate
For sealing exhaust side (944.603.170)

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Reparaturanleitung PS-4600 / PS-5000 8
Repair manual DCS3500 / DCS3501 / DCS4300 / DCS4301 / EA3500F / EA3501F / EA4300F / EA4301F / MEA3500L / MEA3500M / MEA4300G / MEA4300L
1
01
SPROCKET GUARD / CHA
IN TENSIONING SYSTEM
Remove the sprocket guard, bar, and chain.
CAUTION: Do not work on the chain brake
unless the spring is detensioned!
Chain tensioner
Carefully take the chain guide cover off the
guide bar bolts.
Unscrew 4 screws, and remove the spike bar
and the cover.
Chain tensioner function
An angled worm drive converts the turns of
the adjustment screw 1to forward or
backward motion of the tensioning pin.
If necessary, turn adjusting screw 1
clockwise,
until the fastening screw is accessible.
Unscrew the fastening screw and pull the
chain tensioner up and out.
Assembly
Grease spindle and worm gear with multi-
purpose grease (944.360.000).

___
Reparaturanleitung PS-4600 / PS-5000 9
Repair manual DCS3500 / DCS3501 / DCS4300 / DCS4301 / EA3500F / EA3501F / EA4300F / EA4301F / MEA3500L / MEA3500M / MEA4300G / MEA4300L
4
3
2
1
02
CLUTCH DRUM AND CHAIN SPROCKET
Remove the sprocket guard, bar, and chain.
Remove the circlip 4with the universal
wrench.
Remove cup washer 3.
Pull the handguard towards the front grip only
as far as necessary so the clutch drum can be
removed.
Clutch drum with sprocket and needle
bearing
Check the chain sprocket 2for damage and
wear.
Important customer information:
Before installing a new saw chain, always
check the condition of the chain sprocket. A
worn chain sprocket will damage a new saw
chain, and must be replaced.
Check the clutch drum needle bearing for
wear and damage.
Assembly the bearing with multi
-purpose high-
performance grease (944.360.000).
Check the inside of the clutch drum for
damage and wear.
Replace the clutch drum if damaged or worn.
Note: Always use a new circlip 4
(927.408.000)!
When assembling the clutch drum, make
sure that the lug of the oil pump drive 1 is
not positioned on the oil pump drive.
When
inserting, turn the clutch drum slightly.

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Reparaturanleitung PS-4600 / PS-5000 10
Repair manual DCS3500 / DCS3501 / DCS4300 / DCS4301 / EA3500F / EA3501F / EA4300F / EA4301F / MEA3500L / MEA3500M / MEA4300G / MEA4300L
Secure the chain saw from slipping (vise).
Using the disassembly hook (Chap. 00, Pos.
12), disengage the brake band spring 3.
12
3
03
CHAIN BR
AKE / GUIDE BAR BOLT
Removing the brake band
CAUTION: Wear protective gloves to
prevent cuts!
Remove the sprocket guard, bar, and chain.
Remove the clutch drum, see Chapter 02.
Push the hand guard forward to engage the
chain brake. This tensions the brake band
spring.
Remove the cover plate, see Chapter 01.
Fold the brake band 1upward and turn it out
of the disengagement mechanism 2.

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Reparaturanleitung PS-4600 / PS-5000 11
Repair manual DCS3500 / DCS3501 / DCS4300 / DCS4301 / EA3500F / EA3501F / EA4300F / EA4301F / MEA3500L / MEA3500M / MEA4300G / MEA4300L
Remove the handguard and
disengagement mechanism
Unscrew bolt 4and pull out the sleeve 5.
Push handguard arm 6from its position over
the hood towards the muffler.
Replacing the guide bar bolt
Screw two nuts onto the bar bolt and
counterlock them.
Unscrew the bar bolt.
Assembly: Apply Loctite 243 (980.009.000) to
the guide bar bolts and turn them all the way
in.
4
56
7
03
CHAIN BR
AKE / GUIDE BAR BOLT
Remove the circlip 7.
Pull the disengagement mechanism up in
parallel with the axes.
Pull off the handguard with gentle back-and-
forth motion.
When reassembling always use a new
circlip 7 (927.304.000)!
Assemble the handg
uard and disengagement
mechanism, brake band and brake band
spring in reverse order.

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Reparaturanleitung PS-4600 / PS-5000 12
Repair manual DCS3500 / DCS3501 / DCS4300 / DCS4301 / EA3500F / EA3501F / EA4300F / EA4301F / MEA3500L / MEA3500M / MEA4300G / MEA4300L
Move piston to bottom dead centre (visible
through the exhaust opening).
Press the piston stop wedge 3(cap. 00, pos.
5) into the exhaust opening.
Note: Before the piston stop wedge is
pressed into the exhaust opening, it is
necessary to remove the carbon insert in the
exhaust.
Insert wrench 4(Chap. 00, Pos. 7) into the
clutch and use a socket wrench 5to turn in
the direction of the arrow (left-hand thread) to
loosen and remove the clutch.
Turn the clutch over and remove the disc.
The flyweights can now be pushed off the
guide axially in one direction.
12
3
4 5
04
CLUTCH
Disassembly
CAUTION: To prevent cuts, wear protective
gloves!
Remove the sprocket guard, bar and chain.
Pull the handguard towards the front handle to
release the chain brake if necessary.
Remove the clutch drum, see Chapter 02.
Remove the muffler. To do this, unscrew the 3
screws 1and remove the upper muffler half 2.
CAUTION: If a catalytic converter is being
used, the muffler will be very hot after
operation!

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Reparaturanleitung PS-4600 / PS-5000 13
Repair manual DCS3500 / DCS3501 / DCS4300 / DCS4301 / EA3500F / EA3501F / EA4300F / EA4301F / MEA3500L / MEA3500M / MEA4300G / MEA4300L
Installing the clutch
Press the disc onto the clutch. It must be flat
and be engaged.
Installing the clutch
Install the clutch with the arrow marking point
up.
CAUTION: Before installing the clutch,
disassemble the starter in order to prevent
damage to the starting ratchets
04
CLUTCH
Inserting the flyweights
Hook the springs as shown in the illustration.
Then press the flyweights onto the guide. To
do this, first push on two flyweights half-way,
then put on the third flyweight by setting it on
its edge.
Press the flyweights all the way onto the
guide.
CAUTION: Note the position of the springs.
Do not replace springs individually! If a
spring breaks or is fatigued, all three
springs must be replaced. The springs
must not touch the cover.
The illustration shows the inside of the clutch.

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Reparaturanleitung PS-4600 / PS-5000 14
Repair manual DCS3500 / DCS3501 / DCS4300 / DCS4301 / EA3500F / EA3501F / EA4300F / EA4301F / MEA3500L / MEA3500M / MEA4300G / MEA4300L
The suction line 4remains in the crankcase. It
extends into the oil tank. To remove it, carefully
pull on the connection to the oil pump.
Removing the oil pump
Pull the plastic housing off the oil pump by
carefully spreading it apart in the area of the
holes marked 5in the illustration.
Push the adjusting screw 6up against the
spring pressure and turn it until the pin 7goes
into the assembly slit 7. If necessary press the
supply piston 8in somewhat.
Note: For assembly put the adjusting screw in
stop positions 2 or 3, not in one of the outer
stops.
Removing the oil tank vent
Note: The ventilation valve must be pulled out.
It cannot be knocked into the tank.
1 2
3
4
A
1
2
5
3
4
6
8
7
9
05
OIL PUMP
General
The oil pump is driven by the clutch drum. Lugs
on the clutch drum transfer the power to the
drive arms of the oil pump drive 1.
The drive worm of the oil pump drive engages
in the teeth of the oil pump 3.
This means that oil is pumped only when the
chain is running.
The oil flow rate can be adjusted with adjusting
screw A:
• Turn right for more oil
• Turn left for less oil
Disassembly
Remove the clutch drum and clutch, see
chapter 04. Remove brake band, seechapter03.
Turn the oil pump drive 1 counter-clockwise
and pull it off the shaft.
Pull the oil pressure line 2from the oil pump.
Unsrew 2 screws 4and remove the oil pump.

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Reparaturanleitung PS-4600 / PS-5000 15
Repair manual DCS3500 / DCS3501 / DCS4300 / DCS4301 / EA3500F / EA3501F / EA4300F / EA4301F / MEA3500L / MEA3500M / MEA4300G / MEA4300L
If the spring pops out, put it back into the plastic
housing as shown in the schematic.
Assembly
Note: If installing a new return spring cassette,
grease it on the spring side.
Carefully insert new return spring cassette 9
and push it in. Lightly grease the surface of the
spring and spring cassette with multipurpose
grease (944.360.000).
Thread in a new starter cable (dia 3.5 mm /
1/8“, length 980 mm / 38.5“) as shown in the
illustration, tie a knot (as shown in the
illustration) in both ends, and tighten both knots.
Put on the cable drum 8and turn it slightly until
the return spring engages.
Insert spring 7in actuator 6and insert together
into the cable drum 8while turning slightly
counter-clockwise. Insert and tighten screw 5.
Tension the return spring clockwise. Turn the
return spring about 6 turns with the aid of the
cable, which should be pressed into the gap in
the cable drum.
Place the air guide 3in the fan housing and
make sure the two recesses 4engage.
Position the fan housing 2correctly on the saw,
press against it slightly, and pull the starter
handle until the starter catches.
Tighten screws 1.
1 2
4
5
6
7
8
9
3
06
STARTER
Disassembly
Unscrew four screws 1.
Remove fan housing 2.
Remove air guide 3from fan housing.
Detension the return spring.
Injury hazard! Unscrew screw 5 only after
detensioning the return spring!
Unscrew screw 5and remove actuator 6and
spring 7.
Pull off the cable drum 8.
Knock the fan housing against a tabletop with
the entire contact surface of the hollow side,
so that the return spring cassette 9pops out
of the fan housing.
CAUTION! The return spring can jump out
of the plastic cassette! Always wear
protective goggles and gloves!

___
Reparaturanleitung PS-4600 / PS-5000 16
Repair manual DCS3500 / DCS3501 / DCS4300 / DCS4301 / EA3500F / EA3501F / EA4300F / EA4301F / MEA3500L / MEA3500M / MEA4300G / MEA4300L
yes
Is the spark plug dry and properly installed?
Is the spark gap correct? (should be 0.5 mm)
Is the spark plug oily or does it have carbon deposits on it?
Is there damage to the insulation of the high-voltage cable or the ignition cable,
or to the wires themselves?
Is the gap between the flywheel and the ignition module outside of the 0.25-0.3 mm range?
Remove flywheel and check. Is the flywheel damaged?
Is the positioning key damaged?
Continue with troubleshooting in fuel system (tank, fuel hose, carburetor).
Remove spark plug. Is the spark plug damaged? Is it the wrong kind of spark plug?
Is there carbon on the electrodes?
no
yes
no
yes
no
no
no
no
no
no
yes
yes
Dry spark plug cap and fasten firmly to spark plug.
If needed, replace the cap or cap spring.
Replace spark plug. Use ONLY a spark plug approved by DOLMAR.
See operating manual! Otherwise the ignition module might be damaged.
Eliminate the causes for carbon deposits on electrodes (bad two-stroke oil, wrong mix,
defective air filter, check carburetor adjustment).
Use DOLMAR high-performance two-stroke oil.
Adjust spark gap.
Wash spark plug in acetone. Do not sandblast!
If necessary, replace spark plug.
Eliminate cause: wrong carburetor setting, too much oil in fuel,
frequent short operations.
Replace spark plug and check ignition module for corrosion, if necessary replace.
Has the defect been remedied?
Replace high-voltage cable and/or ignition cable. Has the defect been remedied?
Check radial play of drive shaft, and repair if needed.
Replace ignition module if traces of overheating become visible.
Adjust gap between flywheel and ignition module correctly.
Replace flywheel or key. Before installation wipe cone seat at drive shaft
and flywheel with acetone or alcohol to remove any grease.
Tighten fastening nut to the correct torque! Has the defect been remedied?
Replace ignition module. Has the defect been remedied?
no
Install ignition testing lamp.
Alternatively, insert universal wrench between cylinder and hood. The wrench must
have metallic contact with the cylinder. Caution: Do not insert the wrench into the spark
plug hole or hold with hand.
Using insulated pliers, hold the unscrewed spark plug against the wrench.
Caution: Do not hold the spark plug directly against the hole. Detonation hazard!
Pull the starting cable smartly. Is there an ignition spark?
Is the gap uneven? Has the flywheel worn against the ignition module?
no
no
yes
yes
yes
no
no
07
IGNITION S
YSTEM
(TROUBLE
-
SHOOTING)

___
Reparaturanleitung PS-4600 / PS-5000 17
Repair manual DCS3500 / DCS3501 / DCS4300 / DCS4301 / EA3500F / EA3501F / EA4300F / EA4301F / MEA3500L / MEA3500M / MEA4300G / MEA4300L
Screw the disassembly mandrel (chapter 00
pos. 2) onto the threaded end of the shaft.
Do not screw the mandrel all the way down.
Leave about 2 mm between the mandrel and
the flywheel.
Hold the machine in one hand or place on a
soft surface, and knock the flywheel loose with
a tap on the mandrel.
CAUTION: The cone of the crankshaft must
always be degreased before assembly.
07
IGNITION S
YSTEM
Removing the flywheel
Remove starter see chap. 06.
Block the piston, see chap. 04.
Loosen the nut in the direction of the arrow
and remove it along with the washer.

___
Reparaturanleitung PS-4600 / PS-5000 18
Repair manual DCS3500 / DCS3501 / DCS4300 / DCS4301 / EA3500F / EA3501F / EA4300F / EA4301F / MEA3500L / MEA3500M / MEA4300G / MEA4300L
Removing the ignition armature
Remove cover and air filter.
Unsrew screws 2and 12.
Pull fuel lines 6from the primer.
Push detent 7on the primer 8slightly and pull
out the primer.
Disengage short-circuit wire 10 from the
rocker 11 and pull the rocker up and out.
Unscrew screws 5and 9.
Unscrew screw 4.
Pull off spark-plug cap 3and unscrew spark
plug.
Push the spark-plug cap wire grommet out
towards the spark.plug hole.
The cover 1can now be taken up and off.
2
3
4
5
6
7
8
1
12
11
10
9
13
14
15
16
07
IGNITION S
YSTEM
Pull short-circuit wire 15.
Unscrew 2 screws on ignition armature 14.
Remove ignition armature and wire.
Installing the ignition armature
Note: The high-voltage cable is moulded onto
the ignition system and cannot be replaced
separately.
Insert the armature and turn the screws in
almost all the way.
Insert the setting gauge 16 (Kapitel 00 Pos. 3)
between the ignition armature and the
fylwheel.
Position the flywheel so that the magnet is
against the armature (gap 0.25 – 0.3 mm).
Press the ar
mature against the gauge towards
the flywheel and tighten the armature screws.
Then check the gap again to make sure it is
correct.
Attach the short
-circuit wire 15 and press the
rubber grommet into the carburetor base.

___
Reparaturanleitung PS-4600 / PS-5000 19
Repair manual DCS3500 / DCS3501 / DCS4300 / DCS4301 / EA3500F / EA3501F / EA4300F / EA4301F / MEA3500L / MEA3500M / MEA4300G / MEA4300L
Removing the carburetor bottom
Remove throttle linkage 4.
Remove cover (see chapter 07).
Pull short.circuit wire 5from the ignition
armature.
Unscrew screw 6and remove along with the
contact spring 7.
Unscrew screw 8.
Detach pulse line 9.
The carburetor base can now be removed
along with the combination switch.
Note: When assembling, make sure that the
short-circuit switch is pulled through the
rubber grommet as far towards the carburetor
as possible, in order to prevent the wire from
touching the cylinder.
Note: Do not twist the fuel line during
assembly.
Note:
If replacing the foam
10
in the
carburetor base, make sure the position is
correct. The opening should be towards the
suction channel, as shown in the illustration.
5
9
8
10
6
7
4
1
2
3
4
08
CARBURETOR
Removing the intake manifold and
carburetor
CAUTION: Completely empty the fuel tank
before disassembling the carburetor!
Remove cover and air filter.
Move combination switch to safety position.
Unscrew 4 screws 1.
Remove intake manifold 2.
Pull fuel lines and pulse line 3from the
carburetor.
CAUTION: There is fuel in the line. Catch
escaping fuel with a cloth.
Disengage throttle link 4.
Note: When reassembling, engage the
linkage in the marked hole (arrow).

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Reparaturanleitung PS-4600 / PS-5000 20
Repair manual DCS3500 / DCS3501 / DCS4300 / DCS4301 / EA3500F / EA3501F / EA4300F / EA4301F / MEA3500L / MEA3500M / MEA4300G / MEA4300L
General check
• Screen 7 for contamination
• Pulse hole for contamination
Check control parts
(control lever/inlet needle):
Check the tip of the inlet needle for wear.
Check control lever for correct installation, see
illustration to the left.
If the control lever is too low:
• Lack of fuel
• Poor acceleration
• No maximum power
If the control lever is too high:
• Carburetor flooding
• Starting problems
• Poor idling
• Poor transition
Check the pump diaphragm:
• If pump diaphragm is dented, torn, or creased,
• If valve flaps are bent,
replace the diaphragm and gasket
Check control diaphragm:
• If control diaphragm i
s bent or torn, or there
is obvious wear at the button 8.
• If it does not return to its original position
when pulled out of it,
replace the diaphragm and gasket.
08
CARBURETOR
Control lever
Control lever
Correctly
installed
Control lever
Too high
Control lever
Too low
Basic
Setting
(without Limiter Caps)
L= 1 1/2
H= 3
NOTE: Adjust the carburetor only
using a tachometer.
Pressure test
Connect the pressure gauge (chapter
00 item 8 oder 13) to the carburetor
fuel connection 1.
Set up a pressure of max. 0.5 bar.
If the pressure falls, check the
following parts:
• Correct assembly of Control assy
(Control lever, Inlet needle, Lever
spring, lever axle)
• Check seat of inlet needle for
dirt/foreign parts, clean if necessary
• Replace control assy
• Replace gasket 6and diaphragm 5
of the pump side