Husqvarna 325HS Instruction manual

101 90 73-26
Workshop manual
Husqvarna Hedgetrimmers
325HS/ 325HE/ 325HDA
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2
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Workshop Manual
Hedge trimmers
1. Starter ___________________________________ 5
2. Ignition system ____________________________ 7
3. Fuel system _______________________________ 9
4. Centrifugal clutch _________________________ 13
5. Gear ____________________________________ 17
7. Crankshaft and crankcase__________________ 25
8. Exhaust system __________________________ 27
9. Cutting equipment ________________________ 31
© Copyright Husqvarna AB, Sweden 2000
This supplement only takes up elements specific
to the above mentioned models.
For complete information when servicing we rec-
ommend that the supplement is studied together
with theWorkshop Manual.
(Order no. 101 90 74-26)
and the supplement for brushcutters, trimmers,
pruners and hedge trimmers.
(Order no. 101 90 75-26)
Supplement for models 325HS, 325HE,325HDA
Contents
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1.
Starter
Contents
General ___________________________________ 6
Replacing the drive dogs, supplement ___________ 6
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6
1
504 90 00-02
4 mm
Starter
WARNING!
Protective glasses should be worn when working on the starter to avoid injury to the
eyes if, for some reason, the return spring should fly out.
!
Replacing the drive
dogs, supplement.
Make sure the ear on the drive cup is
fitted in the cut-out on the crankshaft.
Replacing the drive
dogs, supplement
325HS75, 325HS99
Fit the balance weight in the drive cup,
if necessary.
Fit the drive cup on the crankshaft.
NOTE!
Risk for incorrect assembly. If the
weight is fitted on the wrong side of the
drive cup the blades will vibrate heavily
when the engine is running.
Deviations:
Starter handle placement.The drive
cup is fitted with a balance weight.
General
See Brushcutter 325.
The balance weight should be facing
the spark plug when the piston is in top
dead centre.
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7
2.
Ignition system
Contents
General 8
Assembling the cylinder cover 8
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8
2
504 90 00-02
4 mm
The spark in an electronic ignition system
has a very short burn time and can therefore
be interpreted as weak and can be difficult to
see while trouble shooting.
Deviations:
The cylinder cover is located using four
screws instead of three. (325HS)
325HS:The speed is limited to 11,600
rpm.
325HDA55/325HE: The speed is limited
to 10,000 rpm.
General
325HS75, 325HS99, 325HE2, 325HE3,
325HE4: See Brushcutter 325.
The thick threaded screw (for the clip
set) should be placed in the hole
closest to the gearbox.
Assembling the cylinder
cover
325HS75, 325HS99:
Check that the ignition cable is in
position in the cut-out in the gearbox.
Align the cylinder cover with the slot for
the screw pin, make sure that when the
cover is moved down that the ignition
cable is secured by the wedge shaped
cut-out in the cylinder cover.
Assembling the cylinder
cover
325HS75, 325HS99:
Fit the cylinder cover.
NOTE!
Risk for incorrect assembly.
The ignition cable can be damaged by
the flywheel if incorrectly routed. The
protective casing on the ignition cable
must be clamped in the securing ear (to
get sufficient length of ignition cable to
the wedge shaped cut-out).
If the wrong screw is placed in the hole
closest to the gearbox the threads in
the clip set will be crossed.
Ignition system
The engine is equipped with an electronic ignition
system completely without moving parts.
Consequently, a faulty component cannot be
repaired, but must be replaced by a new compo-
nent.
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9
3.
Fuel system
Contents
General __________________________________ 10
Assembling the fuel tank ____________________ 10
Max speed, modification_____________________ 11
Assembling the cylinder cover ________________ 11
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10
3Fuel system
In addition to the fuel tank and carburettor, the
fuel system consists of the air filter, fuel filter and
tank venting.
All these components interact so that the engine
receives the optimal mixture of fuel and air to
make it as efficient as possible.Very small devia-
tions in the carburettor setting or a blocked air
filter have a large effect on the running and
efficiency of the engine.
The carburettor can come from several differ-
ent manufacturers on our models, yet the
function and repair methods are essentially the
same.
General
325HS75, 325HS99, 325HDA55
325HE3, 325HE4:
See Brushcutter 325.
Deviations:
Fuel tank and modified design.The
cylinder cover is secured by four
screws. (325HS)
The speed is limited to 11,600 rpm.
(325HS)
The carburettor´s needle H is not
adjustable.(325HDA, 325HE)
The speed is limited to 10,000rpm.
(325HDA, 325HE)
Thread on two rubber supports on top
of the tank.
Position two rubber supports for the
tank on the engine.
Position the tank and align it on the
rubber supports; press down the tank.
Assembling the fuel
tank
325HS75, 325HS99:
Connect the fuel hoses.
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11
3
Fit the starter.
502 71 14-01
Fuel system
Max speed, modification
325HS75, 325HS99, 325HE 2, 325HE 3, 325HE 4:
Model 325HS has an ignition system with speed control set at 11,600 rpm.
Models 325HDA and 325HE have an ignition system with speed control set at
10,000 rpm.
Use the tachometer 502 71 14-01 to check the speed.
If the speed is too low, check that the cutting equipment does not jam.
Assembling the cylinder cover
325HS75, 325HS99:
Fit the cylinder cover, see the instructions under chapter 2 Ignition system.
NOTE!
Risk for incorrect assembly.
The ignition cable can be damaged by the flywheel if incorrectly routed.The
protective casing on the ignition cable must be clamped in the securing ear (to get
sufficient length of ignition cable to the wedge shaped cut-out).
If the wrong screw is placed in the hole closest to the gearbox the threads in the
clip set will be crossed.
Pull the starter handle a little so that the
starter falls into place and position the
screw by the starter handle to secure.
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12
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13
4.
Centrifugal clutch
Contents
Dismantling 14
Assembling 15
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14
4
504 91 06-05
Centrifugal clutch
The centrifugal clutch has the task of transferring
the power from the engine to the cutting equip-
ment’s drive axle. As the name implies, it works
according to a centrifugal principle.
This means the clutch’s friction shoes are thrown
outwards towards the clutch drum at a certain
engine speed.When the friction against the drum
is sufficiently great it drives the drive shaft at the
same speed as the engine.
Some slipping occurs between the clutch and
the clutch drum when accelerating as well as
in the reversed situation when the cutting
equipment jams.Thereby preventing abnormal
load changes on the crankshaft.
The engagement speed has been carefully
tested so that the engine can idle without the
cutting equipment’s drive shaft rotating.
Dismantling
325HS75, 325HS99:
Remove the engine, see 9 Cutting equipment \ Dismantling the gearbox on 325HS.
NOTE!
Both the clutch shoes and spings
should be replaced if damaged.This is
to ensure that no imbalance occurs and
that the correct clutch speed is ob-
tained.
Inset the piston stop 504 91 06-05.
Remove the screws holding the clutch
shoes and remove the clutch shoes and
springs.
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4
6 mm
504 90 00-01
5 mm
504 90 00-03
Centrifugal clutch
Secure the clutch bridge screws using
a weak thread lock fluid.
Tighten the screws with 8-10Nm.
Fit the clutch bridge.
Fit the clutch drum and washer. Secure
the screws using a weak thread lock
fluid.
Lock the cutting equipment by placing a
6 mm allen key through the hole in the
bottom of the gearbox and tighten the
clutch drum screw to 22 Nm.
Assembling
325HS75, 325HS99:
Assembling the clutch drum.
Lock the cutting equipment by placing a
6 mm allen key through the hole in the
bottom of the gearbox and loosen the
clutch drum screw using a 5 mm allen
key. Remove the screw, washer and
clutch drum.
Remove the clutch bridge from the
flywheel.
Remove the clutch drum if it is dam-
aged or worn.
Fit the clutch shoes.
NOTE!
Risk for incorrect assembly.
Turn the clutch shoes so that the cut-
out in the free end section faces
towards the clutch bridge, so that the
screw heads are sunken.
Tighten the screws with 8-10Nm.
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16
4
Fit the engine see 9 Cutting equipment \ Fit the gearbox.
Centrifugal clutch
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17
5.
Gear
Contents
General __________________________________ 18
Dismantling _______________________________ 18
Assembling _______________________________ 21
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18
5
504 90 00-02
4 mm
Gear
The gear has two purposes:
The first is to gear down the engine’s high speed
to better suit the lower speed a blade or trimmer
requires to work efficiently.
Secondly, the gear contributes towards the
operator’s working stance so that it is com-
fortable and at the same time efficient.This
therefore means that cutting equipment is
adjustable in relation to the shaft.The setting
limits the angle limiter.
General
325HDA55, 325HE3, 325HE4
See Brushcutter 325.
Dismantling
325 HDA55, 325HE3, 325HE4
Remover the angle limiter.
Remove the cover from the angle gear
housing.
Remove the support plate for the
cutting equipment.
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19
5
504 90 00-02
4 mm
Remove the two screws. Counter hold
on the axle’s spanner flats.
Remove the housing from the shaft.
Remove the circlip (locking washer) on
the cog wheel in the angle gear.
Remove the circlip and bearing from
the pinion, if necessary.
Remove the outer circlip on the pinion
from the housing for the shaft.
Remove the pinion from the housing
for the shaft.
Use small circlip pliers for the axle and
puller 504 90 90-01.
Heat using a hot air gun to approx.
125°C and knock against a wooden
surface.
Remove the axle and crown wheel from
the angle gear.
Gear
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20
504 90 00-04
3 mm
504 90 00-04
3 mm
5
Remove the cog wheel.
Remove the gearbox cover. With bearing replacement: Heat using a
hot air gun to about 125°C and knock
against a wooden surface.
Remove the eccentric cams.
Remove the felt seals.
Remove the locking plate.
Remove the wear washer.
Remove the connecting rod.
Gear
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