Husqvarna 455 Rancher Operation Manual - Page 35

English

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MAINTENANCE

Spark plug

The spark plug condition is influenced by:

•

Incorrect carburetor adjustment.

•

An incorrect fuel mixture (too much or incorrect type of

oil).

•

A dirty air filter.

These factors cause deposits on the spark plug electrodes,

which may result in operating problems and starting

difficulties.

If the machine is low on power, difficult to start or runs poorly

at idle speed: always check the spark plug first before taking

any further action. If the spark plug is dirty, clean it and check

that the electrode gap is 0.5 mm (0,020"). The spark plug

should be replaced after about a month in operation or earlier

if necessary.

Note! Always use the recommended spark plug type! Use of

the wrong spark plug can damage the piston/cylinder. Check

that the spark plug is fitted with a suppressor.

Lubricating the bar tip sprocket

Lubricate the bar tip sprocket each time you refuel. Use the

special grease gun and a good quality bearing grease.

Needle bearing lubrication

The clutch drum has a needle bearing on the output shaft.

This needle bearing must be lubricated regularly (once a

week). CAUTION! Use only high quality bearing grease or

engine oil. See instructions under the heading Cutting

equipment.

Adjustment of the oil pump

Adjustments are made by turning the screw using a

screwdriver or combination spanner. The machine is supplied

from the factory with the screw set to position 2. Turning the

screw clockwise will reduce the oil flow and turning the screw

anti-clockwise will increase the oil flow.

Recommended settings:

These recommendations apply to Husqvarna’s chain oil, for

other chain oils increase the oil flow by one step.

Cooling system

To keep the working temperature as low as possible the

machine is equipped with a cooling system.

The cooling system consists of:

1

Air intake on the starter.

2

Air guide plate.

3

Fins on the flywheel.

4

Cooling fins on the cylinder.

5

Cylinder cover (directs cold air over the cylinder).

Clean the cooling system with a brush once a week, more

often in demanding conditions. A dirty or blocked cooling

system results in the machine overheating which causes

damage to the piston and cylinder.

Bar 13"-15": Position 1



!

WARNING! The engine must be stopped

when making adjustments.

Section	Page
Key to symbols	2
Contents	3
Dear customer!	4
Before using a new chain saw	6
Important	6
Always use common sense	6
Personal protective equipment	7
Machine¢s safety equipment	7
Chain brake and front hand guard	7
Will my hand always activate the chain brake during a kickback?	9
Will my inetria activated chain brake always activate during kickback in the event of a kickback?	9
Will my chain brake always protect me from injury in the event of a kickback?	9
Throttle lock	9
Chain catcher	9
Right hand guard	9
Vibration damping system	9
Stop switch	10
Muffler	10
Cutting equipment	10
General rules	10
Cutting equipment designed to reduce kickback	11
Sharpening your chain and adjusting depth gauge setting	12
Tensioning the chain	13
Lubricating cutting equipment	14
Fitting the bar and chain	16
Fuel	17
Gasoline	17
Two-stroke oil	17
Mixing	17
Chain oil	17
Fueling	18
Fuel safety	18
Transport and storage	18
Long-term storage	18
Starting and stopping	19
Cold engine	19
Warm engine	19
Starting	19
Stopping	20
Before use:	21
General working instructions	21
Basic safety rules	21
General rules	22
Basic cutting technique	23
Tree felling technique	25
Freeing a tree that has fallen badly	27
How to avoid kickback	28
What is kickback?	28
General	30
Carburetor adjustment	30
Function	30
Basic settings and running in	30
Fine adjustment	30
Conditions	30
Low speed jet L	30
Fine adjustment of the idling speed T	30
High speed jet H	31
Correctly adjusted carburetor	31
Checking, maintaining and servicing chain saw safety equipment	31
Chain brake and front hand guard	31
Throttle lock	32
Chain catcher	32
Right hand guard	32
Vibration damping system	32
Stop switch	33
Muffler	33
Starter	33
Changing a broken or worn starter cord	33
Tensioning the recoil spring	34
Changing a broken recoil spring	34
Fitting the starter	34
Air filter	34
Spark plug	35
Lubricating the bar tip sprocket	35
Needle bearing lubrication	35
Adjustment of the oil pump	35
Cooling system	35
”Air Injection” centrifugal cleaning	36
Winter use	36
Temperature 0°C (32°F) or colder:	36
Temperature -5°C (23°F) or colder:	36
Maintenance schedule	37
Technical data	38
Recommended original and replacement bar and chain combinations	39
Bar and chain combinations	39
YOUR WARRANTY RIGHTS AND OBLIGATIONS	40
MANUFACTURER¢S WARRANTY COVERAGE	40
OWNER¢S WARRANTY RESPONSIBILITIES	40
WARRANTY COMMENCEMENT DATE	40
LENGTH OF COVERAGE	40
WHAT IS COVERED	40
WHAT IS NOT COVERED	40
HOW TO FILE A CLAIM	40
WHERE TO GET WARRANTY SERVICE	40
MAINTENANCE, REPLACEMENT AND REPAIR OF EMISSION-RELATED PARTS	40
EMISSION CONTROL WARRANTY PARTS LIST	40
MAINTENANCE STATEMENT	40
Safety precautions for chain saw users	41
Kickback safety precautions	41

Husqvarna 455 Rancher Operation Manual - Page 35

Spark plug, Lubricating the bar tip sprocket, Needle bearing lubrication, Adjustment of the oil pump

Page 35 highlights