Husqvarna 42 Workshop Manual Repair
Husqvarna 42 Workshop Service Manual for the Husqvarna 42 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 42 chainsaw. View pages online or download a complete PDF service manual that you can easily save, print or view on any device.
Husqvarna 42 Workshop Service 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 42 Chainsaw Specifications
YEAR INTRODUCED: 1988
YEAR DISCONTINUED: 1995
ENGINE DISPLACEMENT: 42ccm (2.5 cu. in.)
CYLINDER BORE: 42 mm (1.65 in.)
PISTON STROKE: 30 mm (1.18 in.)
PISTON RING THICKNESS: 1.5 mm
CYLINDER TYPE: Aluminum with Chrome plated bore
INTAKE METHOD: Piston ported
H.P.: 2.9 hp (2.1 kW)
WEIGHT: 4.7 kg (10.4 lbs.), powerhead only
CHAIN BRAKE: Inertia activated
DRIVE TYPE: Direct
CONSTRUCTION: Die cast Magnesium, injection molded Polymer
MAGNETO TYPE: Electronic SEM AM7
CARBURETOR: Walbro HDA-34A, 84, 98, 108 series
STARTER TYPE: Automatic rewind
OIL PUMP: Automatic, worm gear driven
MAXIMUM ENGINE RPM: 14,500 max free after break in, 9,300 under load.
IDLE RPM: 2,700
IGNITION TIMING: fixed
BREAKER POINT SETTING: none
FLYWHEEL/COIL AIR GAP: 0.30 mm (0.012 in.)
SPARK PLUG TYPE: Champion RCJ7Y, Bosch WS7F
SPARK PLUG GAP: 0.5 mm (0.020 in.)
CRANKSHAFT MAIN BEARINGS: Ball
FUEL TANK CAPACITY: 520 ml (17.6 fl. oz.)
FUEL OIL RATIO: 50:1
RECOMMENDED FUEL OCTANE: Regular grade
MIX OIL SPECIFICATION: Electrolux approved mix oil, Husqvarna mix oil
CHAIN PITCH: .325 in.
CHAIN TYPE: Oregon 20LP, 21LP
SHORTEST GUIDE BAR SUPPLIED: 33 cm (13 in.)
LONGEST GUIDE BAR SUPPLIED: 45 cm (18 in.)
Read the Husqvarna 42 Workshop Manual for more chainsaw specs.
The Husky 42 chainsaw, including 42 special was made between the years 1988 to 1995.
The Husky 42 chainsaw uses a two-cycle single-cylinder engine rated at 2.1 horsepower. The cylinder is bored to 1.65 inches in diameter with a total volume of 2.6 cubic inches. This cylinder supports a single piston that operates at a maximum speed of 14,500 revolutions per minute and is designed to idle at 2,700 rpm with a stroke of 1.18 inches.
Ignition and Fuel Systems
The Husky 42 chainsaw uses a model HDA98 Walbro brand carburetor to control the flow of fuel into the engine from the fuel tank. The fuel tank holds 1.1 pints of fuel, while the bar oil tank holds 0.57 pints of bar oil. Oil is delivered to the guide bar from an automatic oil pump at a rate of 3 to 7 milliliters per minute with the engine running at 8,500 rpm. This saw uses two-cycle engine oil for air-cooled engines mixed with gasoline at a ratio of 1 part oil per 33 parts gasoline. Husqvarna recommends using gasoline with an octane rating of at least 90 to reduce the risk of thermal damage to the engine.
There are five sizes of guide bar compatible with the Husky 42 chainsaw: 11-, 13-, 15-, 16- and 18-inch guide bars. The standard guide bar for this saw is only 13 inches long, however. At full power, the chain rotates around these bars at 17.9 meters per second. The chain is driven around the guide bar by a 7-tooth drive sprocket that is compatible with chains and bars with a pitch of 0.325 inch. The groove in the guide bar that the chain’s drive links fit into has a width of 0.05 or 0.058 inch.
Chain Saw Ergonomics
Two-cycle engines have short mufflers that can generate noise levels strong enough to damage a user’s hearing over periods of long exposure. The Husky 42 chainsaw generates 106.5 decibels of noise while in operation that is effectively reduced to 99.5 decibels at the operator’s ear. Wearing hearing protection when you use your saw protects you from long-term hearing loss. Vibrations generated by the Husky 42 chainsaw will cause exhaustion and can cause damage to joints in the hands and lower arms. The front handle of the saw vibrates at 3.6 meters per second squared, while the rear handle vibrates at 5.4 meters per second squared. The amount of vibration translated from the engine to the user is reduced by shock absorbers mounted in the rear handle.
Husqvarna 42 Workshop Manual PDF
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