Husqvarna 340, 345, 346XP/G, 350, 351/G Chainsaw Workshop Manual (P/N 101 90 26–26)

Husqvarna workshop manual 101 90 26-26 covers the 340, 345, 346XP/G, 350, and 351/G chainsaws. It documents repair of individual subassemblies as well as complete chainsaw disassembly and reassembly.

Text search and section navigation: The PDF has searchable text and nine embedded bookmarks covering the main sections and Appendix A. Individual repair topics are listed in the contents; they do not have separate bookmarks.

• Engine repair: Piston and cylinder inspection, decompression-valve and cylinder pressure testing, crankcase disassembly, crankshaft inspection, and bearing replacement.

• Carburetor and fuel system: Troubleshooting charts, carburetor overhaul and pressure testing, standard and EPA adjustment procedures, and fuel tank, hose, and filter service.

• Ignition and heated grips: Ignition-module testing, flywheel removal, stop-switch resistance checks, and generator and heater-element diagnosis for heated-handle models.

• Clutch and chain lubrication: Centrifugal-clutch removal and wear inspection, oil-pump service, and adjustment procedures for models with adjustable pumps.

• Chain brake and controls: Brake-band inspection, brake operating tests, chain-catcher replacement, and throttle-lock, throttle-trigger, and choke-control repair.

• Starter assembly: Starter-cord and recoil-spring replacement, spring tensioning, and inspection of the pulley and flywheel pawls.

• Workshop reference data: Component-specific tightening torques, lubrication instructions, wear limits, electrical test specifications, and illustrated special-tool reference tables.

This manual is written for personnel who already have general experience repairing and servicing chainsaws.

Piston, Cylinder, and Crankcase Repair

The engine sections include cylinder-surface and piston-ring inspection criteria. The cylinder pressure-test illustration identifies the sealing plates and test connection, while the decompression valve has its own leak-test procedure.

Separate instructions distinguish the 340/345/350 bearing-housing arrangement from the split crankcase used on the 346XP/G and 351/G. Crankshaft assembly-tool illustrations and the different bearing-installation methods help you select the appropriate repair procedure before dismantling the saw.

The piston and cylinder instructions flag intake-system leaks as a potential cause of engine seizure. Husqvarna's separate piston-failure analysis guide, referenced in this section, is not included.

Walbro Carburetor and Fuel-System Diagnosis

Troubleshooting charts group starting, idling, acceleration, and high-speed running faults by likely cause. The carburetor pressure-test table connects leakage locations with faults in the needle valve, pump diaphragm, or metering diaphragm.

Carburetor section views explain the metering, mixing, and pump systems through cold-start, idle, part-throttle, and full-throttle operation. The technical data identifies the Walbro HDA 154A and US-market HDA 159A.

EPA adjustment: Appendix A addresses replacement carburetors and H/L needles with limiter caps on US EPA-certified saws. These procedures are separate from the standard carburetor settings and fine-adjustment instructions.

Fuel-tank inspection and fuel-hose and filter replacement are also covered. The hose-handling notes warn that knurled pliers can damage the hose and cause leaks or fractures.

Ignition, Heated Grips, and Starter Service

Ignition-module testing uses a specified test plug, and the flywheel section illustrates ignition air-gap adjustment. For the 346XPG and 351G, separate resistance checks distinguish faults in the generator, heater switch, and front or rear heating elements; lead-routing illustrations accompany heater replacement.

Starter repair covers cord wear, pulley teeth, flywheel pawls, and recoil-spring replacement and tensioning. Follow the manual's safety precautions for the starter and chain-brake springs, which can release suddenly and cause injury.

Clutch, Oil Pump, and Chainsaw Hardware

Clutch inspection addresses shoe wear, the chain drive wheel, and the drum's needle bearing. The oil-pump instructions distinguish the fixed pumps on the 340/345 from adjustable units on the 350, 346XP/G, and 351/G; exploded views identify the different pump-hose arrangements.

Brake-band wear checks and a post-repair chain-brake operating test accompany the brake overhaul instructions. Related sections cover the muffler (silencer), chain catcher, throttle controls, choke control, and guide bar bolts.

Damaged-thread repair distinguishes magnesium and plastic crankcases and identifies repair kit 503 27 33-01. The tool references also identify clutch tool 502 54 16-01 and pressure tester 502 50 38-01.

Printable PDF and Included Appendix

Supplied as one English-language, printable 50-page PDF: one cover page, 48 numbered main-manual pages, and the one-page EPA carburetor Appendix A. The cover and appendix are already included in the 50-page total.