The Husqvarna 357XP is a professional-grade chainsaw designed for demanding forestry and arborist work. This workshop manual provides comprehensive technical information for service, maintenance, and repair. It covers the XP series engine, X-Torq technology, fuel system, ignition, cooling, lubrication, chain brake, clutch, guide bar, chain, and all associated components. Below are key sections for safety, specifications, disassembly, troubleshooting, and assembly procedures.
Key components: X-Torq engine for reduced emissions, professional-grade crankshaft, decompression valve, adjustable oil pump, inertia-activated chain brake, side-mounted chain tensioner, and anti-vibration system.
| Feature | Description |
|---|---|
| Engine Type | 2-stroke, single cylinder, X-Torq technology |
| Displacement | 56.5 cc |
| Power Output | 3.5 kW (4.7 hp) |
| Fuel Tank Volume | 0.77 liters |
| Oil Tank Volume | 0.38 liters |
| Bar Length (Recommended) | 15" to 20" (38 cm to 50 cm) |
| Chain Pitch | 3/8" or .325" |
| Ignition System | Electronic, SEM or similar |
| Weight (Powerhead) | Approx. 5.9 kg (13 lbs) |
| Decompression Valve | Standard for easier starting |
Always wear appropriate PPE: helmet, eye protection, hearing protection, gloves, chainsaw chaps, and steel-toe boots. Work in a clean, well-ventilated area.
WARNING! Fuel is highly flammable. No smoking or open flames. The chain can cause severe injury even when the engine is off.
Required for service: Torx screwdrivers (T27), socket set (8mm-13mm), feeler gauges, compression tester, piston stop tool, flywheel puller (Husqvarna 502 50 41-01 or equivalent), clutch removal tool, pressure/vacuum tester for crankcase, carburetor adjustment tool.
Special Tools: Flywheel holder (Husqvarna 502 51 94-01), crankshaft seal installer, bearing puller set.
Disassembly: Remove top cover, air filter, carburetor, and muffler. Cylinder and Piston: Inspect for scoring, carbon buildup, and ring wear. Measure piston clearance. Crankshaft and Bearings: Check for play and smooth rotation. Seals: Replace crankcase seals if leaking (pressure test recommended).
Torque Values (Nm): Cylinder bolts: 10-12 Nm. Muffler bolts: 8-10 Nm. Connecting rod bolts: 8-10 Nm (if applicable).
Carburetor: Clean all jets, diaphragms, and gaskets. Adjust H (high speed) and L (low speed) screws to factory settings (typically 1 turn out from lightly seated). Fuel Lines: Check for cracks and replace if hardened. Fuel Filter: Replace annually or as needed. Tank Vent: Ensure it is clear.
Tip: Always pressure test the fuel system after reassembly to check for leaks.
Components: Flywheel, ignition coil (module), spark plug, stop switch, and wiring. Testing: Check spark with a tester. Air gap between coil legs and flywheel magnets should be 0.30 mm. Use a multimeter to check coil primary and secondary resistance (refer to service manual for specific values).
WARNING! Do not crank the engine with the spark plug removed and connected if testing for spark outside the cylinder—fuel vapor can ignite.
Chain Brake: Inspect band for wear, check inertia mechanism and spring. Clutch: Remove with clutch tool (left-hand thread). Inspect shoes for wear and drum for scoring. Centrifugal clutch engages at approximately 2800 RPM.
Bar: Clean groove, check for straightness and wear. Dress rails with a flat file if uneven. Chain: Sharpen with correct file size (typically 4.0 mm for 3/8" chain). Check depth gauges (rakers) and reduce with a depth gauge tool. Lubrication: Test oil pump output by running saw at high speed near a light surface; oil should form a line.
CAUTION! Always use the correct chain and bar combination. Incorrect pitch will damage the sprocket and bar.
| Symptom | Possible Cause | Corrective Action |
|---|---|---|
| Engine will not start | No spark, flooded, fuel issue | Check spark plug, ignition coil gap, fuel lines, carburetor diaphragms. |
| Engine starts then dies | Fuel filter clogged, tank vent blocked | Replace fuel filter, clean tank vent. |
| Loss of power | Clogged air filter, muffler screen, carb adjustment | Clean/replace air filter, clean spark arrestor screen, adjust carburetor. |
| Excessive vibration | Loose components, unbalanced clutch, AV mounts worn | Tighten all bolts, inspect clutch shoes, replace anti-vibration mounts. |
| Chain does not oil | Oil pump faulty, lines blocked, bar holes clogged | Clean oil passages, replace pump if defective, check oil pick-up filter. |
| Chain brake does not engage | Band worn, mechanism dirty, spring broken | Clean and inspect brake mechanism, replace band or spring. |
Compression Test: Should read at least 120 psi for a healthy engine.
Reassemble in reverse order of disassembly. Lubricate bearings and seals lightly with 2-stroke oil. Use a torque wrench for critical fasteners.
Final Check: After assembly, check for fuel/oil leaks, proper chain tension, and that all safety features (chain brake, throttle lock) function correctly before starting.
Service: For genuine parts and technical support, contact an authorized Husqvarna service dealer or visit www.husqvarna.com.