MS 180C STIHL Parts Manual

The MS 180C is a lightweight, professional-grade chainsaw from STIHL, featuring the STIHL Quickstop® inertia chain brake, STIHL Ematic™ lubrication system, and STIHL ErgoStart™ easy starting system. This parts manual provides detailed diagrams, part numbers, and ordering information for maintenance, repair, and replacement of components. Below are key sections for safety, features, parts diagrams, specifications, maintenance, and troubleshooting.

Features at a Glance

Key components: Engine cylinder, Carburetor, Air filter system, Chain brake assembly, Guide bar, Saw chain, Oil pump, Starter assembly, Fuel tank, Handle system.

Installation & Assembly

Unpack and inspect contents. Assemble on clean, stable surface.

1. Attach guide bar and chain: Place bar on studs, align chain with sprocket, adjust tension.
2. Install handle: Secure front and rear handle assemblies with provided bolts.
3. Fill tanks: Add STIHL HP Ultra oil to oil tank; mix fuel (50:1 gasoline to STIHL oil).
4. Check chain brake: Ensure brake band engages properly when front hand guard is pushed forward.

WARNING! Always wear protective gloves when handling chain. Ensure all fasteners are tightened to specified torque.

First-Time Setup

Before first start, complete pre-operation checks.

1. Chain tension: Adjust so chain snaps back when pulled from guide bar.
2. Chain lubrication: Check oil flow by holding saw over light surface and running at high idle.
3. Fuel system: Prime carburetor by pressing fuel bulb 5-10 times.
4. Starting procedure: Set master control lever to cold start position; pull starter rope until engine fires.

CAUTION! Never start saw unless bar and chain are properly installed and tensioned.

Specifications

• Engine Displacement: 1.8 cu in (30.1 cm³).
• Power Output: 1.8 kW (2.4 hp).
• Weight (without cutting equipment): 8.6 lbs (3.9 kg).
• Fuel/Oil Ratio: 50:1 (STIHL HP Ultra or equivalent).
• Ignition System: Electronic, capacitor discharge.
• Carburetor: STIHL Zama diaphragm carburetor with compensator.
• Chain Speed: 59 ft/s (18 m/s) at maximum power.
• Sound Pressure Level: 104 dB(A).
• Vibration Levels: Left/Right handle: 3.5/4.5 m/s².

Controls and Settings

Master Control Lever: Combines stop switch, choke, and run positions. Throttle Trigger: Controls engine speed. Throttle Trigger Interlock: Must be depressed to operate throttle. Chain Brake Lever: Manual activation; inertia-activated. Decompression Valve: Reduces starting effort. Chain Catcher: Prevents broken chain from striking operator. Front Hand Guard: Activates chain brake when pushed forward.

Adjustments: Chain tension (side knob), Idle speed (LA screw), High speed (H screw), Oil pump output (adjusting screw).

Connecting Accessories

STIHL ROLLOMATIC® Guide Bar: Compatible with 16" and 18" lengths. STIHL PICCO™ Micro 3 (PMM3) Saw Chain: .325" pitch, .050" gauge. STIHL Scabbard: For bar protection during transport and storage. STIHL Fuel Can: For proper fuel mixing and storage.

1. Ensure saw is off and cool before installing accessories.
2. Match chain pitch and gauge to guide bar specifications.
3. Use only STIHL-approved accessories for optimal performance and safety.

Tip: Always clean bar groove and oil holes before installing new chain.

Operating Procedures

Supports felling, limbing, bucking, and pruning operations.

1. Starting: Set master control to cold start; pull starter rope until engine fires; move to run position.
2. Warm-up: Allow engine to idle for 30 seconds before applying load.
3. Cutting: Apply light pressure; let chain do the work; avoid twisting in cut.
4. Chain brake test: Regularly test by pushing hand guard forward at idle.
5. Shutdown: Allow to idle for 30 seconds; move master control to stop position.
6. Chain sharpening: Use STIHL filing kit; maintain 30° top plate angle.
7. Bar maintenance: Rotate bar regularly; clean oil passages weekly.
8. Storage: Empty fuel tank; run carburetor dry; clean entire saw.

WARNING! Always wear chainsaw protective equipment: helmet, eye/ear protection, gloves, chaps, and boots.

Safety Features

Chain Brake: Inertia-activated and manual. Throttle Trigger Interlock: Prevents accidental throttle engagement. Chain Catcher: Reduces risk from broken chain. Right Hand Guard: Protects from rear kickback. Anti-vibration System: Reduces operator fatigue. Decompression Valve: Makes starting safer and easier.

Care & Maintenance

Clean after each use. Check all fasteners before operation.

Daily: Clean air filter, check chain tension, inspect guide bar, clean cooling fins. Weekly: Clean spark arrestor screen, check fuel filter, clean chain brake components. Monthly: Check spark plug gap (0.020"), clean carburetor compartment, inspect anti-vibration elements.

CAUTION! Use only STIHL-approved replacement parts. Never modify safety devices.

Regulatory Information

EPA Phase III compliant: Meets emission standards for handheld engines. CARB certified: Approved for use in California. EU Directive 2006/42/EC: Complies with machinery safety requirements. Copyright © 2025 STIHL Incorporated; all trademarks property of STIHL. For genuine parts and service, visit www.stihlusa.com or contact 1-800-467-8445.

Troubleshooting

Reset: After chain brake activation, pull back hand guard until click is heard.

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