For Husqvarna Parts Call 606-678-9623 or 606-561-4983
335 XPT
Workshop Manual
101 89 44-26
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CONTENTS
Introduction ....................................................3
Safety instructions .........................................4
Key to symbols...............................................5
Technical data.................................................6
Tools................................................................8
Trouble shooting ..........................................10
Service data ..................................................12
Safety equipment .........................................14
Starter............................................................19
Ignition system .............................................21
Centrifugal clutch.........................................23
Carburettor....................................................25
Tank unit........................................................33
AV-System.....................................................37
Crankshaft, Piston and Cylinder................ 38
Bar bolt..........................................................42
Oil pump........................................................43
2 – English
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INTRODUCTION
General
This workshop manual describes in detail how trouble shooting,
repairs and testing of the chain saw should be carried out. The
different safety precautions that must be taken when carrying
out repairs are also described.
Safety
Note!
The section dealing with safety should be read and
understood by all persons repairing or servicing the
chain saw.
Warning signs are displayed in the workshop manual and on
the chain saw. See page 5. If any of the warning symbols on the
chain saw have be damaged or are missing a new symbol
should be fitted as soon as possible so that the greatest level of
safety is attained when the chain saw is used.
Target group
The workshop manual has been written for persons assumed to
have a general knowledge of the repair and service to small
engines.
The workshop manual should be read and understood by those
persons who carry out repairs and service to the chain saw. The
manual is also suitable for use during the training of new
employees.
Layout
This workshop manual can be used in two different ways:
• Reparation of a particular system on the chain saw.
• Dismantling and Assembling the entire chain saw.
Reparation of a particular system
When a particular system on the chain saw must be repaired
proceed as follows:
1. Look up the page for the system.
2. Carry out the sections:
• Dismantling
• Cleaning and inspection
• Assembly
Dismantling and assembling the
entire chain saw
When the entire chain saw shall be stripped and rebuilt proceed
as follows:
1. Turn to page 19, which deals with the Starter and carry out
the instructions under the heading Dismantling.
2. Go forward in the manual and carry out Dismantling in the
order the sections appear.
3. Return to the Starter on page 19 and carry out the instructions under Cleaning and inspection.
Modifications
Modifications to the chain saw will be successively introduced
during production. When these modifications affect servicing
and/or spare parts special service bulletins will be sent out on
each occasion. This means that this workshop manual in time
will be out-of-date. To prevent this the manual should be read
with all service bulletins regarding the chain saw in question.
Tools
Special tools must be used during certain procedures. All
service tools are listed in this workshop manual. Usage is
evident from respective sections.
Always use Husqvarna's original:
• Spare parts
• Service tools
• Accessories
4. Work forward in the manual and carry out Cleaning and
inspection in the order the sections appear.
5. Order or collect all requisite spare parts from the spare
parts store.
6. Turn to page 44 that deals with the Oil pump and carry out
the instructions under Assembly.
7. Work towards the beginning of the manual and carry out
Assembly in the order the sections appear.
To broaden understanding some sections are introduced by a
Description of the unit in question.
Numbering
Positioning indicators to components within the figures are
denoted by A, B etc.
Positioning indicators start again from A in each new section.
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English – 3
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SAFETY INSTRUCTIONS
General instructions
Workshops where chain saws are to be repaired must be
equipped with safety equipment as set out in local directives.
No one may repair the chain saw without first reading and
understanding the contents of this workshop manual.
The boxes shown below can be found in appropriate places in
this workshop manual. Warning boxes are positioned before the
procedures they refer to.
WARNING!
!
NOTE!
This box warns of damage to material if the instructions
are not followed.
Warning boxes warn for the risk of personal
injuries if the instructions are not followed.
Special instructions
The fuel used in the chain saw has the following dangerous
characteristics:
• The liquid and its vapours are poisonous.
• Can cause skin irritation.
• Is extremely inflammable.
The bar, chain and clutch cover (chain brake) must be fitted
before the saw is started otherwise the clutch can come loose
and cause personal injury.
Use ear protection when test running.
Do not use the saw before it is adjusted so that the chain does
not rotate when idling.
Do not touch the muffler after test running until it has cooled.
Risk of burn injuries.
Inadequate chain lubrication can result in the chain breaking,
which can cause serious, even fatal injury.
Make sure the starter recoil spring does not fly out and cause
personal injury.
The spring can fly out and cause personal injury, if the spring
tension is activated on the cord pulley when removed.
Check that the brake is in the braking position when the
pressure springs on the chain brake shall be removed. Otherwise the pressure spring can fly out and cause personal injury.
When using compressed air, the air jet should never be pointed
towards the body. Air can be forced into the blood stream,
which can cause fatality.
4 – English
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KEY TO SYMBOLS
Symbols
CAUTION! Chain saws can be dangerous!
Careless or incorrect use can result in
serious or fatal injury to the operator or
others.
Please read the instructions carefully and
make sure you understand them before
using the saw.
Always wear:
• Approved protective helmet
• Approved hearing protection
• Protective glasses or visor
Where possible, always use both hands
when operating the chain saw.
Switch off the engine by moving the stop
switch to the STOP position before carrying
out any checks or maintenance.
Operating position.
Choke.
Always wear approved protective gloves.
Regular cleaning is required.
Avoid contact between the guide bar tip and
any object.
Contact with the guide bar tip can cause the
saw to be thrown violently upwards and
backwards (kickback), which can result in
serious injury.
This saw should only be used by
persons who are specially trained
in tree maintenance work.
See the Operator's manual!
Visual check.
Protective glasses or a visor must be worn.
Refuelling.
Chain oil and chain oil flow adjustment.
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English – 5
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TECHNICAL DATA
Displacement Bore Stroke Max. power/ speed
3
/ cubic inches Ø mm/Ø inches mm/inches kW/hp/ rpm
cm
35.2/2.1 38/1.5 31/1.22 1.6/2.1/ 9 600
Spark plug gap Ignition system Air gap Carburettor
mm/inches mm/inches
0.7/0.028 FHP/CD 0.3/0.01 Walbro WT
Bar length Chain speed at Chain pitch Drive link gauge
cm/inches m/s inches mm/inches
29-39/12"-16" 18.3 3/8" 1.3/0.050
max power
6 – English
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TECHNICAL DATA
Idling speed Engagement speed Max. speed Spark plug
rpm rpm rpm
2 800 4 100 13 800 Champion
NGK BPMR 7A
Fuel tank volume Oil pump capacity Oil tank volume Automatic oil pump
Litres/US. pint cm
0.3/0.63 3-7 0.16/0.34 Yes
Weight without bar and chain Weight with bar and chain Handle heater
kg/lbs kg/lbs Watt/ rpm
3.4/7.5 4.0/8.8 - / -
3
/min Litres/US. pint
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English – 7
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TOOLS
12 34
56 7
8 9 10 11
8 – English
12 13 14 15
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TOOLS
The tools listed here are service tools used for the chain saw in
question. In addition to these tools a standard set of tools is
also required.
Pos Description Used to Order no.
1 Piston assembly tool Assembling the piston 502 50 70-01
2 Cover plate, manifold Seal the manifold 502 52 01-01
3 Cover plate, exhaust Seal the exhaust port 502 52 31-01
4 Pressure tester Produce pressure for testing 502 50 38-01
5 Puller Removing bearing from crankshaft 504 90 90-01
6 Piston stop Lock the crankshaft 502 50 33-01
7 Tachometer Carburettor adjustment 502 71 14-01
8 Test spark plug Check the ignition module 502 71 13-01
9 Feeler gauges, air gap Ignition module adjustment 502 51 34-02
10 Assembly mandrel Assembly of spark plug guard 502 50 06-01
11 Hook for fuel filter Remove the fuel filter 502 50 83-01
12 Assembly fixture Fixture of the chain saw 502 51 02-01
13 Sleeve Dismantling the flywheel 502 51 94-01
14 Allen key, 3 mm For M-4-screws 502 50 19-01
14 Allen key, 4 mm For M-5-screws 502 50 18-01
15 Allen key, 3 mm For M-4-screws 502 50 86-01
15 Allen key, 4 mm For M-5-screws 502 50 87-01
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English – 9
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TROUBLE SHOOTING
Trouble shooting schematic
Faults that can develop on the chain saw are divided into four
groups as follows. In each category, possible malfunctions are
shown on the left, with a list of possible faults on the right. The
most probable fault is given first and so on.
Starting
Difficult starting
Carburettor leaking
fuel
Flooding when the
engine is not running
Idling (low rpm)
Will not idle
Adjust L-screw
Air filter blocked
Choke not working
Worn choke shaft
Worn choke valve
Fuel filter blocked
Fuel line blocked
Piston ring seized
Blocked impulse channel
Loose or faulty fuel pipe
Hole in diaphragm
Worn needle valve/needle
Control system sticking
Control system set too high
Leak in control system (air or fuel)
Loose cover on carburettor
pump side
Worn needle valve
Control system set too high
Control system sticking
Adjust L-screw
Leaking manifold (rubber)
Loose carburettor mounting bolts
Loose or faulty fuel pipe
Fuel filter blocked
Fuel line blocked
Fuel tank ventilator blocked
Throttle lever shaft stiff
Throttle cable sticking
Defective throttle return spring
Bent throttle lever shaft stop
Faulty diffuser jets
Idling (low rpm) (cont.)
Idles when L-screw
is closed
Idling uneven
L-screw requires
constant adjustment
Too much fuel when
idling
Worn needle valve/needle
Leaking control diaphragm/cover plate
Control system sticking
Worn throttle lever in control system
Faulty diffuser jets
Fuel filter blocked
Fuel line blocked
Leaking manifold (rubber)
Loose carburettor mounting bolts
Worn throttle valve shaft
Loose throttle valve screw
Worn throttle valve
Control system sticking
Leak in throttle system (air or fuel)
Control diaphragm centre knob is
worn
Hole in diaphragm
Leaking control diaphragm/cover plate
Crankcase leaking
Fuel line blocked
Control system set too high
Control system sticking
Control system (air or fuel)
Leaking control diaphragm/cover plate
Faulty diffuser jets
Crankcase leaking
Control system set too high
Control system sticking
Control system damaged
Worn needle valve
Leaking control diaphragm/cover plate
Control system incorrectly assembled
Idling too rich
10 – English
Adjust L-screw
Worn needle valve/needle
Control system set too high
Worn throttle lever in control system
Leaking control diaphragm/cover plate
Control system sticking
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TROUBLE SHOOTING
High rpm Acceleration and retardation
throttle
Low power
Will not "four-stroke"
Adjust H-screw
Blocked air filter
Blocked fuel tank ventilator
Blocked fuel filter
Fuel line blocked
Loose or damaged fuel line
Impulse channel leaking
Impulse channel blocked
Loose cover on carburettor pump side
Faulty pump diaphragm
Leaking manifold (rubber)
Loose carburettor mounting bolts
Control system set too low
Control system damaged
Control system incorrectly assembled
Leaking control diaphragm/cover
Control system sticking
Blocked muffler
Adjust H-screw
Blocked fuel tank ventilator
Blocked fuel filter
Impulse channel leaking
Impulse channel blocked
Loose cover on carburettor pump side
Faulty pump diaphragm
Blocked air filter
Control system sticking
Leak in throttle system (air or fuel)
Control system incorrectly assembled
Loose diaphragm
Hole in diaphragm
Leaking control diaphragm/cover
Blocked fuel tank ventilator
Blocked fuel filter
Fuel line blocked
Loose or damaged fuel line
Impulse channel leaking
Impulse channel blocked
Loose cover on carburettor pump side
Faulty pump diaphragm
Leaking manifold (rubber)
Loose carburettor mounting bolts
Control system set too low
Leak in throttle system (air or fuel)
Control system incorrectly assembled
Loose diaphragm
Hole in diaphragm
Leaking control diaphragm/cover plate
Does not accelerateWill not run at full
Engine stalls when
throttle is released
Too rich acceleration
Adjust L-screw
Adjust H-screw
Blocked air filter
Blocked fuel tank ventilator
Blocked fuel filter
Fuel line blocked
Loose or damaged fuel line
Impulse channel blocked
Loose cover on carburettor pump side
Faulty pump diaphragm
Leaking manifold (rubber)
Loose carburettor mounting bolts
Control system set too low
Control system incorrectly assembled
Control system sticking
Faulty diffuser jets
Blocked muffler
Adjust L-screw
Adjust H-screw
Faulty pump diaphragm
Control system set too high
Control system sticking
Faulty diffuser jets
Adjust L-screw
Adjust H-screw
Blocked air filter
Faulty pump diaphragm
Faulty diffuser jets
Trouble shooting methods
In addition to faults given in the above schematic, trouble
shooting can be carried out on a specific component or subsystem of the chain saw. The different testing procedures are
described in respective sections and are as follows:
1. Pressure testing the carburettor.
See page 30.
2. Pressure testing the crankcase and cylinder.
See page 41.
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English – 11
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SERVICE DATA
●
2-3
15
20-26
▲
▲
●
❑
▲
Character key
Numbers by components that are bolted refer to
the tightening torque in Nm.
▲ = Lubricate using two-stroke oil.
■ = Lubricate using engine oil.
● = Lubricate using grease.
❑ = Glued using 2-component adhesive.
❍ = Sealed using silicone.
12 – English
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8-10
■
❍
8-10
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SERVICE DATA
2,5-4
2-3
1-2
2-3
8-10
10-15
▲
❍
▲
6-7
2-3
2,5-4
2-3
20-26
▲
2,5-4
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English – 13
A
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SAFETY EQUIPMENT
Chain brake
Dismantling
1. Check that the chain brake is in the off position and
dismantle the clutch cover and bolt (A).
2. Remove the circlips (B) and (C) and press/knock out the
pins.
3. Remove the handle.
4. Remove the four bolts (D) and remove the cover.
B
C
D
D
D
WARNING!
Check that the brake is in the on position.
!
5. Lift out the pressure spring by loosening the back edge
using a screwdriver.
6. Knock out the pin (E) and remove the knee link with the
attached brake band.
7. Unscrew the brake band from the knee link.
Otherwise the pressure spring can fly out and
cause personal injury.
D
E
Inspection
Clean and inspect all parts.
The thickness of any part of the brake band must not be below
0.8 mm (0.031").
14 – English
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