Husqvarna 45 Workshop Service Manual


Husqvarna 45 Workshop Manual for the service and repair of the Husqvarna 45 chainsaw. View pages online or download a complete PDF manual with clear easy to understand images, diagrams and information. Print or save to any device.

Husqvarna 45 Workshop Manual Repair

Husqvarna 45 Workshop Manual for the Repair for the Husqvarna 45 chainsaw. The PDF workshop service manual has accurate, easy to understand information and diagrams to help repair and service the chainsaw. Service Information to help you to troubleshoot, repair and fix the Husqvarna 45 chainsaw. View pages online or download a complete PDF service manual that you can easily save, print or view on any device.

Husqvarna 45 Workshop Manual Contents

Contents, Introduction, Safety Regulations, Symbols, Technical data, Service tools, Service data, Safety equipment, Starter, Electrical system, Centrifugal clutch, Lubrication system, Carburetor, Tank unit, Anti-vibration system, Piston and cylinder, Crankcase and crankshaft, Troubleshooting, Repair Instructions.

Carburetor – General Chainsaw Adjustment

Adjusting the carburettor involves adjusting the engine to the local conditions e.g. climate, altitude, fuel and type of two-stroke oil. The carburettor is equipped with three adjustment options.
L = Low speed jet
H = High speed jet
T = Idling adjustment screw

The L and H jets adjust the fuel flow to match the airflow that the throttle valve opening allows. Turning them clockwise makes the fuel/air mixture weaker (less fuel in relation to the amount of air) and turning them anti-clockwise makes the fuel/air mixture richer. A weak mixture increases the engine speed and a rich mixture decreases the engine speed. The T screw controls the throttle position when idling. Turning the T screw clockwise gives faster idling; turning it anti-clockwise lowers idling speed (see manual for complete guide).

See the complete service workshop manual, carburetor manual, parts list, operator manual and technical supplements PDF downloads. Also the repair and service articles available on this website for more information on how to service, repair and find parts for the chainsaw.

Husqvarna 45 Chainsaw Specifications

ENGINE DISPLACEMENT: 44ccm (2.7 cu. in.)
CYLINDER BORE: 42mm (1.65 in.)
PISTON STROKE: 32mm (1.26 in.)
CYLINDER TYPE: Aluminum with Chrome plated bore
H.P.: 2.7 hp (2.0 kW)
WEIGHT: 4.7 kg (10.8 lbs.), powerhead only
HANDLEBAR SYSTEM: Anti-vibration
CHAIN BRAKE: inertia activated
CLUTCH: Centrifugal
CONSTRUCTION: Die cast Magnesium, injection molded Polymer
MAGNETO TYPE: Electronic, Phelon
CARBURETOR: Walbro WT-17A, 17D or Zama C1Q-EL1, C1Q-EL5
STARTER TYPE: Husqvarna automatic rewind
OIL PUMP: Automatic
MAXIMUM ENGINE RPM: 12,500 max free after break in, with bar and chain installed, 9,000 under load.
IDLE RPM: 2,500
FLYWHEEL/COIL AIR GAP: 0.30 mm (0.012 in.)
SPARK PLUG GAP: 0.5mm (0.020 in.)
FUEL TANK CAPACITY: 500 ml (16.9 fl. oz.)
Husqvarna Two-stroke chain saw mix oil or equivalent
50:1 with Husqvarna mix oil
CHAIN PITCH: .325 in.
CHAIN TYPE: Oregon 21

Read the Husqvarna 45 Workshop Manual for more chainsaw specs.

The Husky 45 chainsaw (including Husky 45 special) is a mid-range chainsaw intended for homeowner use. This two-cycle gas-powered chainsaw uses a mixed fuel to power the single piston engine. The Husqvarna 45 is a great chainsaw for cutting firewood and medium logs. It’s not a professional saw for heavy use.

The Husky 45 chainsaw was in production from 1987 to 1995 and was inspired by the old Partner 400 series chainsaw.


Well built
Reliable/Durable vintage model
Light weight


Not for all cutting tasks
OEM parts hard to find

The 45 Husky Engine

The single piston moves inside the cylinder and has a size of 44 cm cubed or 2.7 cubic inches. This piston creates a stroke of 32 mm or 1.26 inches, which moves in a bore of 42 mm or 1.62 inches. At a speed of 9,000 rpm’s, this engine generates about 2.2 kW of power. The recommended maximum speed for this engine is 12,500 rpm’s, and it should idle at 2,500 rpm’s. The centrifugally operated clutch uses its centrifugal force to engage the clutch drum and sprocket.

The Ignition System

The ignition system for this chainsaw was manufactured by the R.E. Phelon Company. The spark plug used for the ignition system is a Champion RCJ 7Y. This spark plug needs a gap of .02 inches or .5 mm. The ignition module connects to the lead wire and the short-circuit or ground wire.

Fuel and Lubrication System

The carburetor on the 45 chainsaw is a Zama C1Q, which uses a butterfly valve and has an integrated fuel pump beside the carburetor. The fuel tank will fill to a capacity of 1.06 pt. or .5 L. The fuel used on this engine is a mixed fuel. You should only use 90-octane regular unleaded fuel mixed with air-cooled two-cycle engine oil at a ratio of 33:1. You should never mix the fuel with automotive oil, outboard two-cycle oil or four-cycle oil. The oil tank has a capacity of .53 pt. or .25 L. On the side of the saw, near the oil tank, the 45 has an adjustable screw that allows you to control the output of bar oil, but the oiling system is automatic.

Chain and Bar Information

The standard recommended bar size for this chainsaw should be 13 inches or 33 cm, but it can also operate with a 14-, 16- and 18-inch bar. The usable cutting length for this saw ranges from 12.6 to 17.5 inches. The chain speed at maximum power is 17.4 meters per second. The recommended chain pitch for this saw is .325 inches with a drive link that’s .05 inches thick. The number of teeth on the drive sprocket is 7.


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