Stihl MS 310 Parts Manual

The Stihl MS 310 is a professional-grade chainsaw featuring a powerful engine, robust construction, and advanced safety features. This parts manual provides detailed diagrams, part numbers, and ordering information for maintenance, repair, and replacement of components. Below are key sections covering identification, major assemblies, engine components, cutting equipment, and ordering procedures.

1. Identification & Specifications 2. Major Assemblies & Exploded Views 3. Engine & Fuel System Parts 4. Ignition & Electrical System Parts 5. Cutting Attachment & Bar/Chain Parts 6. Handle, Housing & Safety Parts 7. Maintenance & Replacement Intervals 8. Torque Specifications 9. Parts Ordering Information 10. Warranty & Service 11. Troubleshooting Parts Issues

Identification & Specifications

Key identifiers: Model number (MS 310), Serial number location (on crankcase), Engine type (2-stroke), Displacement, Power output.

Feature	Description
Engine Displacement	59.0 cc (3.6 cu. in.)
Power Output	3.4 kW (4.6 bhp)
Fuel Tank Volume	550 ml (18.6 fl. oz.)
Oil Tank Volume	260 ml (8.8 fl. oz.)
Guide Bar Lengths (Recommended)	40 cm (16"), 45 cm (18")
Chain Pitch/Gauge	.325" / .063" (1.6 mm)
Weight (Powerhead only)	6.2 kg (13.7 lbs)
Ignition System	Electronic, capacitor discharge (CDI)
Carburetor	STIHL HD-12
Anti-Vibration System	Standard

Major Assemblies & Exploded Views

Refer to diagrams for part identification and assembly relationships.

Crankcase Assembly: Includes cylinder, piston, crankshaft, bearings.
Fuel System Assembly: Tank, cap, filter, lines, carburetor.
Ignition Assembly: Flywheel, coil, spark plug, stop switch.
Cutting Attachment Assembly: Clutch, sprocket, guide bar, chain.
Handle & Housing Assembly: Front/rear handles, antivibration elements, covers.

WARNING! Use genuine STIHL parts only. Incorrect parts can cause failure or injury.

Engine & Fuel System Parts

Engine components part numbers and descriptions.

Cylinder & Piston: Cylinder (1143 020 1201), Piston (1143 030 2001), Rings.
Crankshaft & Bearings: Crankshaft (1140 030 4205), Main bearings, Seals.
Carburetor: HD-12 assembly (1140 120 0650), Repair kit, Adjustment screws.
Fuel Tank: Tank assembly, Cap, Filter (0000 350 3501), Fuel line.
Air Filter: Filter element (0000 120 1620), Cover, Pre-filter.

CAUTION! Ensure engine is cool before disassembly. Use proper tools.

Ignition & Electrical System Parts

Ignition Module: CDI unit (1140 400 1305).
Spark Plug: Bosch WSR 6F or equivalent (0000 400 1300).
Flywheel: With magnets (1140 400 1203).
Stop Switch: Assembly (1140 960 1500).
Wiring: Harness, ground wire, connector.
Starter Assembly: Rope, pulley, spring, handle.

Cutting Attachment & Bar/Chain Parts

Clutch, sprocket, guide bar, chain, and tensioning components.

Clutch: Drum (1140 160 2001), Shoes, Spring. Sprocket: Rim sprocket (.325") (1140 007 1003). Guide Bar: STIHL Rollomatic E (3003 000 4516 for 16"). Chain: STIHL Oilomatic 63PM3-72 (72 drive links). Tensioning: Screw, pin, side cover nuts.

Handle, Housing & Safety Parts

Front handle, rear handle, antivibration buffers, covers, safety features.

Turn off engine and disconnect spark plug before handling cutting parts.
Inspect parts for wear (e.g., sprocket, bar rails, chain cutters).
Replace in sets when necessary (e.g., bar and chain).

Tip: Regularly clean bar groove and oil holes.

Maintenance & Replacement Intervals

Recommended part replacement schedule for optimal performance and safety.

Air Filter: Clean daily; replace when damaged.
Spark Plug: Replace every 100 operating hours.
Fuel Filter: Replace annually or when clogged.
Chain: Sharpen regularly; replace when cutters worn below limit.
Guide Bar: Turn periodically; replace if rails worn or damaged.
Sprocket: Replace with every second chain or if worn.
Anti-Vibration Buffers: Replace if hardened or cracked.
Carburetor Diaphragms: Replace if engine runs poorly.

WARNING! Use only STIHL-approved replacement parts. Incorrect parts void warranty.

Torque Specifications

Critical fastener torque values (Nm).

Component	Torque (Nm)	Part Number Reference
Cylinder bolts	10 Nm	1143 020 1201
Clutch nut	40 Nm	1140 160 2001
Flywheel nut	40 Nm	1140 400 1203
Spark plug	25 Nm	0000 400 1300
Guide bar nuts	9-10 Nm	3003 000 4516

Parts Ordering Information

Provide model and serial number when ordering. Use genuine STIHL parts.

CAUTION! Keep parts clean and organized during disassembly.

Warranty & Service

STIHL Limited Warranty covers defects in materials/workmanship. Warranty may be voided by use of non-STIHL parts or improper service. For service, contact an authorized STIHL servicing dealer. Find dealers at www.stihlusa.com or contact STIHL Incorporated at 1-800-467-8445.

Troubleshooting Parts Issues

Symptom	Possible Part Cause	Corrective Action
Engine won't start	Fouled spark plug, faulty ignition module	Replace spark plug; test/replace CDI unit.
Loss of power	Clogged air/fuel filter, worn piston/cylinder	Replace filters; inspect cylinder/piston for scoring.
Chain won't turn	Worn clutch, damaged sprocket	Inspect clutch shoes/spring; replace sprocket.
Excessive vibration	Worn anti-vibration buffers, loose fasteners	Replace buffers; tighten all handle/frame screws to spec.
Oil leakage	Damaged tank, cracked lines, worn seals	Inspect oil tank/lines; replace crankcase seals if needed.

Dealer Service: For complex repairs, consult authorized STIHL dealer.

Support: 1-800-467-8445; www.stihlusa.com