Husqvarna 181 Manuel d'instructions

Workshop

manual

chain saw model

101 88 11-26

181

Contents

1■TechnicalData.3

2■ServiceData—5

3■SpecialTools 7

4■Fuelsystem 11

5■Electricsystem 17

6■Lubricatingsystem 1

7■Cylinder,Piston 23

8■Crankcase,Crankshaft _

9■Starter —33

10 wCentrifugalClutch—35

11 ■SafetyEquipment 37

Technical Data ■

Displacement

Bore

Stroke

Poweroutput

Ignitionsystem

Ignitionadvance

Air gap

Sparkplugtype

Electrodegap

Handleheating(181SG)

Carburetor

Fueltankvolume

Oiltankvolume

Chain lubrication

Clutchdrum/sprocket

Weights

Weight sawbody incl. chain brake (empty)

Weight sawbody (empty) incl. chain brake and

18“ bar and chain

Classificationtable

80.7 cm3 (4.9 cu in)

52.0 mm (2.05”)

38.0 mm (1.5”)

4.0 kW (5.5 hp) at 140 r/s (8.400 r/rein)

Make SEM type AM 7

25° before t.d.c. at 142 r/s (8.500 r/rein)

0.30 mm (0.01 2“)

Champion RCJ 7Y

0.5 mm (0.020”)

56 watts at 120 r/s (7.200 r/rein)

Diaphragm carburetor make Tillotson type HS 216

Basic setting:

H=1.0

L=1.0

0.85 Iitres (0.22 US gallon, 0.19 Imp gallon).

Fuel mixture 4% (1 :25)

With Husqvarna Twostroke Oil 2% (1 :50)

0.50 Iitres (0.13 US gallon, 0.11 Imp gallon)

Automatic. No supply during idling. Adjustable for 4different delivery rates.

Recommended ~ositions:

Bar 18“; Pos. 2

Bar 20” and more: Pos. 3–4

Standard 7teeth. Optional 8teeth. 3/8” pitch.

6.8 kg 15.0 lb 7.0 kg 15.4 lb

8.2 kg 18.1 lb 8.4 kg 18.5 lb

CcPc

PLEASE NOTE!

As “A” denotes smallest cylinder diameter and “C’” the largest, piston grades

should be matched or one grade smaller. Eg it is not permissible to use agrade

Bpiston in agrade Acylinder.

Service Data ■

CrankcaseAssy

v0.04 MPa (0.4 kp/cm2, 5.7 psi)

l0,01 MPa/1 min (0.1 kp/cm2, 1.4 psi per rein)

TOOIS: 5025037-01 Vacuum gauge

5025047-01 Cover plate, inlet port

5025081-01 Cover plate, exhaust port

P0.08 MPa (0.8 kp/cm2, 11.4 psi)

l0.02 MPa/30 sec (0.2 kp/cm2, 2,8 psi per 30 see)

TOOIS: 5025038-01 Pressuregauge

5025047-01 Cover plate, inlet port

5025081-01 Cover plate, exhaust port

Fueltank

PreSSUre: 0.05 MPa (0.5 kp/cm2, 7. Ip

LNo leakage permitted

:5025038-01 Pressuregauge

Starter

Make sure that it is possible to turn the pulley at least about 1/4 turn further

when the cord is pulled out completely.

Carburetor

p0.03 MPa (0.3 kp/cm2, 4.3 psi)

LNo leakage permitted

:5025038-01 Pressuregauge

Special Tools ■

Assembling pliers, ~:i: ‘[ “Puller compl. with screw

spark plug protector

5 4

5 3

Allen key

Fitting tool compl. for

crankshaft and sealing ring

@p@

-,,,$* \

—

Stud fitting tool

5 8

Socket spanner

Holding bar compl.

Ball bearing puller compl.

Piston sto~

Revolution counter

Vacuum gauge compl.

Special Tools ■

!5 3

5 4

Allen screwdriver with ball

~..

Retouch paint, orange 1/8 I

aC,ampingdevice

Glue, adhesive

SEM electric system tester

Air gap tool

Extractor sealing ring

Puller for engineblock

%Fitting drift, sealing ring

Loctite AA (normal locking power)

bLoctite AAV (strong locking power)

2■Service Data

Chainbrake

.When used with a18“ guide bar the Swed-o-Matic should release at aload on

the bar tip of 12–17 kp (26–37 lb).

Replace the brake band as soon aswear has reduced its original thickness by

more than 25~0, i.e. at least 0,75 mm (0.03”) must be left of the original

band thickness.

Fueland oil

The twostroke engine is lubricated by oil mixed with petrol in various pro-

portions depending on the type of oil used:

Ordinary twostroke oil 1:25 (4% oil)

Husqvarna Twostroke oil 1:50 (2% oil)

See also the mixing table below:

Mixing table 2% 4%

Litres Pints Litres Petrol in Petrol in Litres Petrol in Petrol in

of oil of oil of petrol Imp gallon US gallon of petrol Imp gallon US gallon

0.2 0.35 10 2,2 2.6 51.1 1,3

0.4 0.70 20 4.4 5.2 10 2.2 2.6

1.0 1.76 50 11.0 13.2 25 5.5 6.6

Fuelsystem I

Removalof carburetor

Remove the air filter and the fuel hose.

Remove the throttle push rod from the plastic lever with apair of flat hose

pliers.

Remove the stop switch in order to get at the left screw that retains the carbu-

retor,

Push out the choke control from the lever on the carburetor.

Loosen the screw that connects the air filter elbow to the crankcase.

Loosen the socket head screws that retain the carburetor (use the Allen key

No. 502501 8-01) and lift the carburetor off together with the air filter el-

bow and the screws.

Clean the carburetor on the outside.

Remove the metering diaphragm cover and the metering diaphragm.

Note that the centre pin of the diaphragm enters the forked end of the lever of

the needle valve,

Connect the pressure gauge 5025038-01 to the fuel inlet of the carburetor

and pump until apressure of 0.03 MPa (0.3 kp/cm2 )is reached.

Check for any leakage at the needle valve or at the gasket on the pump side.

The easiest way of locating leakages is to pour some petrol where you suspect

the leakages to be.

Loosen the screw that retains the bearing shaft of the lever and remove lever,

shaft, spring and needle valve.

Drill asmall hole in the welch plugs (approx. @2mm) and prise away the plugs

by means of apointed tool.

NOTE! Drill with care in order not to damage the carburetor housing.

Unscrew the two adjusting needles.

Remove the cover above the pump diaphragm and remove diaphragm and

gasket.

Lift off the fuel screen carefully by means of apointed tool.

3■Special Tools

Pressuregauge compl.

RDistance sleeve (57 mm)

o: 5

Cover plate, inlet port

Cover plate, exhaust port

’Assembling pliers,

centrifugal clutch

‘,

Repair kit for elec-

tric cables

Cable clip pliers

,--’

\Fitting sleeve for

sealing ring

U-spanner for vibration

damper

Hook for fuel filter

4Fuel system ■

D.....

‘%,.,,.,

‘.

When properly adjusted the lever of the needle valve shall be on alevel with the

carburetor housing surrounding it.

If the lever is located too high, the carburetor will be very sensitive as regards

the adjustment of the adjusting needles,

Atoo low lever induces bad acceleration qualities.

Check that the lever can move freely.

Make apressure test of the carburetor. Proceed as mentioned above,

Then mount gasket, metering diaphragm and cover.

NOTE!

Care should be taken to ensure that the centre pin of the diaphragm

enters the fork in the lever!

Install the adjusting needles and screw them out to the following basic posi-

tion: H=1.0 turn open. L=1.0 turn open.

Adjustmentof carburetor

Before adjusting the carburetor, proceed asfollows:

.Clean the air filter or, if necessary, replace it with anew one.

.Check the spark plug and its electrodes.

.Check that the fuel filter is not clogged.

Examine the fuel filter as follows:

Loosen the fuel hose from the carburetor and lay the chain saw on the clutch

side. Open the tank cap, If there is enough fuel in the tank, some of it now

ought to run out of the hose.

After having made the abovementioned checks you make abasic adjustment of

the carburetor needles, i.e. H=1turn open and L=1turn open.

Start the chain saw and warm it uby applying full throttle and letting it

cut into alog.

Aconstant speed for 10–20 sec indicates not only agood high speed function

of the carburetor but also agood condition overall.

Should there be asudden lean suPPly to the engine after approx. 10–20 sec

full throttle running (big speed increase), this would indicate some fault in the

fuel system.

The trouble may be caused by:

.Leakage in the pumping section of the carburetor.

.Crack in the insulating piece.

.Loose carburetor bolts.

.Incorrectly assembled or leaking gaskets.

.Tank breather valve inoperative.

.Fuel filter clogged.

NOTE!

Too lean adjustment of the carburetor would cause aconsiderable loss

of power. Adjust the carburetor in order to obtain maximum power and

not maximum speed.

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