Husqvarna 435 Chainsaw Parts Manual

The Husqvarna 435 is a professional-grade chainsaw designed for demanding forestry and arborist work. This parts manual provides detailed diagrams, part numbers, and ordering information for all components of the Husqvarna 435 chainsaw, including the engine assembly, cutting equipment, fuel system, ignition system, and safety features. Below are key sections for identification, assembly groups, parts lists, and ordering.

1. Identification & Serial Numbers 2. Engine Assembly & Cylinder Group 3. Fuel System & Carburetor 4. Ignition System & Electronics 5. Cutting Equipment & Bar/Chain 6. Starter Assembly & Recoil 7. Safety Features & Chain Brake 8. Air Filtration System 9. Exhaust System & Muffler 10. Ordering Parts & Exploded Views 11. Torque Specifications & Assembly Notes

Identification & Serial Numbers

Locate the model and serial number plate on the rear of the saw, near the handle. This information is critical when ordering parts.

Identification Mark	Location & Purpose
Model Number	Stamped on plate; identifies saw as Husqvarna 435
Serial Number	Unique identifier for manufacturing date and batch
Type Designation	Specifies engine type and configuration
Emission Compliance	Indicates EPA/CARB certification
Bar Length Code	Original equipment bar specification

Engine Assembly & Cylinder Group

Complete parts listing for the 40.9cc X-Torq engine.

Cylinder: Includes cylinder, decompression valve, and cylinder bolts.
Piston & Connecting Rod: Piston, piston rings, wrist pin, circlips, connecting rod.
Crankshaft & Bearings: Crankshaft assembly, main bearings, seals.
Crankcase: Upper and lower halves, gaskets, mounting screws.

WARNING! Engine disassembly requires specialized tools. Always refer to service manual for procedures.

Fuel System & Carburetor

Components for the fuel tank, lines, filter, and Zama C1Q-S carburetor.

Fuel Tank: Tank assembly, cap, vent, and mounting hardware.
Fuel Lines: Supply and return lines, impulse line.
Fuel Filter: In-tank filter element.
Carburetor: Complete carburetor assembly, adjustment screws, gaskets, throttle linkage.
Air Control: Choke and throttle controls, springs, levers.

CAUTION! Ensure fuel system is clean and lines are not cracked before operation.

Ignition System & Electronics

Ignition Module: SEM electronic ignition, includes coil and wiring.
Spark Plug: Champion RCJ7Y or equivalent, gap 0.5mm (0.020").
Stop Switch: On/off switch assembly and wiring harness.
Wiring Harness: Complete harness connecting ignition, switch, and coil.
Flywheel & Magneto: Flywheel with magnets, key, and retaining nut.
Spark Arrestor: Screen in muffler (check local regulations).

Cutting Equipment & Bar/Chain

Parts for guide bar, saw chain, and drive system. Front Panel: POWER, OPEN/CLOSE, AUTO/DPMS, MUTE.

Guide Bar: Husqvarna branded bars in lengths from 13" to 18". Part numbers vary by length and pitch.

Saw Chain: 3/8" LP pitch, .050" gauge, 56-72 drive links depending on bar. Sprocket: Rim sprocket or spur sprocket assembly. Clutch: Centrifugal clutch assembly, drum, springs. Bar Mounting: Nuts, bolts, tensioner screw, adjuster, side cover.

Starter Assembly & Recoil

Recoil starter housing, rope, pulley, spring, and handle.

Turn off saw and allow to cool before servicing starter.
Disassemble housing to access rewind spring.
Replace frayed rope and lubricate pulley.

Tip: Wind spring carefully under tension to avoid injury.

Safety Features & Chain Brake

Includes inertia-activated chain brake, front hand guard, and throttle lockout.

Chain Brake Band: Steel band that stops chain when activated.
Activation Mechanism: Inertia weight and spring assembly.
Hand Guard: Plastic guard that triggers brake manually.
Throttle Lockout: Prevents accidental throttle engagement.
Right Hand Guard: Protects from chain breakage.
Brake Flag & Spring: Returns brake to disengaged position.
Linkage: Connects hand guard to brake band.
Inspection: Test function regularly; replace if band is worn or mechanism is sluggish.

WARNING! Never operate a chainsaw with a malfunctioning chain brake or safety features.

Air Filtration System

Two-stage air filter (pre-filter and main filter), cover, and hardware.

Exhaust System & Muffler

Muffler assembly, gasket, spark arrestor screen, and mounting bolts.

CAUTION! Muffler gets extremely hot during operation. Allow to cool completely before handling.

Ordering Parts & Exploded Views

Use genuine Husqvarna parts. Reference exploded view diagrams with corresponding 6-digit part numbers. Contact an authorized Husqvarna dealer or visit the official parts website. Copyright © 2025 Husqvarna AB; trademarks of Husqvarna AB. For support, visit www.husqvarna.com or contact your local dealer.

Torque Specifications & Assembly Notes

Component	Torque Specification	Notes
Cylinder Bolts	10 Nm (88 in-lb)	Tighten in a crisscross pattern in two stages.
Clutch Nut	35-40 Nm (26-30 ft-lb)	Left-hand thread. Use clutch tool to hold.
Flywheel Nut	40 Nm (30 ft-lb)	Right-hand thread. Use flywheel holder.
Spark Plug	25 Nm (18 ft-lb)	Do not over-tighten.
Bar Mounting Nuts	9-10 Nm (80-88 in-lb)	Ensure chain tension is correct after tightening.

General Notes: Use thread locker where specified. Replace gaskets and seals during reassembly. Ensure all safety components are installed and functional.

Service: Authorized Husqvarna dealers only. www.husqvarna.com